Abstract

We demonstrate a convenient and fast method to measure the spectrally resolved far-fields of multimode terahertz quantum cascade lasers by combining a microbolometer focal plane array with an FTIR spectrometer. Far-fields of fundamental TM0 and higher lateral order TM1 modes of multimode Fabry-Pérot type lasers have been distinguished, which very well fit to the results obtained by a 3D finite-element simulation. Furthermore, multimode random laser cavities have been investigated, analyzing the contribution of each single laser mode to the total far-field. The presented method is thus an important tool to gain in-depth knowledge of the emission properties of multimode laser cavities at terahertz frequencies, which become increasingly important for future sensing applications.

© 2016 Optical Society of America

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    [Crossref]
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    [Crossref]
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    [Crossref]
  4. Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
    [Crossref] [PubMed]
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    [Crossref] [PubMed]
  6. L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
    [Crossref]
  7. M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref]
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    [Crossref] [PubMed]
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    [Crossref]
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    [Crossref] [PubMed]
  19. J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
    [Crossref]
  20. P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
    [Crossref]
  21. M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
    [Crossref]
  22. H. Cao, J. Y. Xu, Y. Ling, A. L. Burin, E. W. Seeling, X. Liu, and R. P. H. Chang, “Random lasers with coherent feedback,” IEEE J. Sel. Top. Quantum Electron. 9(1), 111–119 (2003).
    [Crossref]

2016 (1)

2015 (1)

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2015).
[Crossref]

2014 (1)

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

2013 (3)

C. Sirtori, S. Barbieri, and R. Colombelli, “Wave engineering with THz quantum cascade lasers,” Nat. Photonics 7(9), 691–701 (2013).
[Crossref]

J. Oden, J. Meilhan, J. Lalanne-Dera, J.-F. Roux, F. Garet, J.-L. Coutaz, and F. Simoens, “Imaging of broadband terahertz beams using an array of antenna-coupled microbolometers operating at room temperature,” Opt. Express 21(4), 4817–4825 (2013).
[Crossref] [PubMed]

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

2012 (3)

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

J. He, P. Liu, Y. He, and Z. Hong, “Narrow bandpass tunable terahertz filter based on photonic crystal cavity,” Appl. Opt. 51(6), 776–779 (2012).
[Crossref] [PubMed]

A. Hugi, G. Villares, S. Blaser, H. C. Liu, and J. Faist, “Mid-infrared frequency comb based on a quantum cascade laser,” Nature 492(7428), 229–233 (2012).
[Crossref] [PubMed]

2011 (1)

A. A. Tavallaee, B. S. Williams, P. W. C. Hon, T. Itoh, and Q.-S. Chen, “Terahertz quantum-cascade laser with active leaky-wave antenna,” Appl. Phys. Lett. 99(14), 141115 (2011).
[Crossref]

2009 (3)

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
[Crossref]

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

2008 (2)

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
[Crossref]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

2007 (3)

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15(1), 113–128 (2007).
[Crossref] [PubMed]

M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics 1(2), 97–105 (2007).
[Crossref]

B. S. Williams, “Terahertz quantum-cascade lasers,” Nat. Photonics 1(9), 517–525 (2007).
[Crossref]

2006 (2)

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 /spl times/ 240 microbolometer focal-plane array,” IEEE Photonics Technol. Lett. 18(13), 1415–1417 (2006).
[Crossref]

2003 (1)

H. Cao, J. Y. Xu, Y. Ling, A. L. Burin, E. W. Seeling, X. Liu, and R. P. H. Chang, “Random lasers with coherent feedback,” IEEE J. Sel. Top. Quantum Electron. 9(1), 111–119 (2003).
[Crossref]

1995 (1)

E. N. Lewis, P. J. Treado, R. C. Reeder, G. M. Story, A. E. Dowrey, C. Marcott, and I. W. Levin, “Fourier transform spectroscopic imaging using an infrared focal-plane array detector,” Anal. Chem. 67(19), 3377–3381 (1995).
[Crossref] [PubMed]

Adam, A. J. L.

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

Amanti, M. I.

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

Andrews, A. M.

S. Schönhuber, M. Brandstetter, T. Hisch, C. Deutsch, M. Krall, H. Detz, A. M. Andrews, G. Strasser, S. Rotter, and K. Unterrainer, “Random lasers for broadband directional emission,” Optica 3(10), 1035–1038 (2016).
[Crossref]

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

Andronico, A.

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Barbieri, S.

C. Sirtori, S. Barbieri, and R. Colombelli, “Wave engineering with THz quantum cascade lasers,” Nat. Photonics 7(9), 691–701 (2013).
[Crossref]

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Beck, M.

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2015).
[Crossref]

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

Beere, H. E.

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
[Crossref]

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

Belarouci, A.

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

Belkin, M. A.

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
[Crossref]

Beltram, F.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
[Crossref]

Blaser, S.

A. Hugi, G. Villares, S. Blaser, H. C. Liu, and J. Faist, “Mid-infrared frequency comb based on a quantum cascade laser,” Nature 492(7428), 229–233 (2012).
[Crossref] [PubMed]

Brandstetter, M.

S. Schönhuber, M. Brandstetter, T. Hisch, C. Deutsch, M. Krall, H. Detz, A. M. Andrews, G. Strasser, S. Rotter, and K. Unterrainer, “Random lasers for broadband directional emission,” Optica 3(10), 1035–1038 (2016).
[Crossref]

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

Burin, A. L.

H. Cao, J. Y. Xu, Y. Ling, A. L. Burin, E. W. Seeling, X. Liu, and R. P. H. Chang, “Random lasers with coherent feedback,” IEEE J. Sel. Top. Quantum Electron. 9(1), 111–119 (2003).
[Crossref]

Cao, H.

H. Cao, J. Y. Xu, Y. Ling, A. L. Burin, E. W. Seeling, X. Liu, and R. P. H. Chang, “Random lasers with coherent feedback,” IEEE J. Sel. Top. Quantum Electron. 9(1), 111–119 (2003).
[Crossref]

Capasso, F.

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
[Crossref]

Castellano, F.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

Chang, R. P. H.

H. Cao, J. Y. Xu, Y. Ling, A. L. Burin, E. W. Seeling, X. Liu, and R. P. H. Chang, “Random lasers with coherent feedback,” IEEE J. Sel. Top. Quantum Electron. 9(1), 111–119 (2003).
[Crossref]

Chassagneux, Y.

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Chen, Q.-S.

A. A. Tavallaee, B. S. Williams, P. W. C. Hon, T. Itoh, and Q.-S. Chen, “Terahertz quantum-cascade laser with active leaky-wave antenna,” Appl. Phys. Lett. 99(14), 141115 (2011).
[Crossref]

Colombelli, R.

C. Sirtori, S. Barbieri, and R. Colombelli, “Wave engineering with THz quantum cascade lasers,” Nat. Photonics 7(9), 691–701 (2013).
[Crossref]

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Coudevylle, J. R.

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Coutaz, J.-L.

Davies, A. G.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
[Crossref]

Detz, H.

S. Schönhuber, M. Brandstetter, T. Hisch, C. Deutsch, M. Krall, H. Detz, A. M. Andrews, G. Strasser, S. Rotter, and K. Unterrainer, “Random lasers for broadband directional emission,” Optica 3(10), 1035–1038 (2016).
[Crossref]

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

Deutsch, C.

S. Schönhuber, M. Brandstetter, T. Hisch, C. Deutsch, M. Krall, H. Detz, A. M. Andrews, G. Strasser, S. Rotter, and K. Unterrainer, “Random lasers for broadband directional emission,” Optica 3(10), 1035–1038 (2016).
[Crossref]

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

Dowrey, A. E.

E. N. Lewis, P. J. Treado, R. C. Reeder, G. M. Story, A. E. Dowrey, C. Marcott, and I. W. Levin, “Fourier transform spectroscopic imaging using an infrared focal-plane array detector,” Anal. Chem. 67(19), 3377–3381 (1995).
[Crossref] [PubMed]

Faist, J.

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2015).
[Crossref]

A. Hugi, G. Villares, S. Blaser, H. C. Liu, and J. Faist, “Mid-infrared frequency comb based on a quantum cascade laser,” Nature 492(7428), 229–233 (2012).
[Crossref] [PubMed]

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
[Crossref]

Fan, J. A.

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
[Crossref]

Fischer, M.

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

Gao, J. R.

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

Garet, F.

Gellie, P.

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

He, J.

He, Y.

Hisch, T.

Hon, P. W. C.

A. A. Tavallaee, B. S. Williams, P. W. C. Hon, T. Itoh, and Q.-S. Chen, “Terahertz quantum-cascade laser with active leaky-wave antenna,” Appl. Phys. Lett. 99(14), 141115 (2011).
[Crossref]

Hong, Z.

Hovenier, J. N.

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

Hu, Q.

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15(1), 113–128 (2007).
[Crossref] [PubMed]

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 /spl times/ 240 microbolometer focal-plane array,” IEEE Photonics Technol. Lett. 18(13), 1415–1417 (2006).
[Crossref]

Hugi, A.

A. Hugi, G. Villares, S. Blaser, H. C. Liu, and J. Faist, “Mid-infrared frequency comb based on a quantum cascade laser,” Nature 492(7428), 229–233 (2012).
[Crossref] [PubMed]

Itoh, T.

A. A. Tavallaee, B. S. Williams, P. W. C. Hon, T. Itoh, and Q.-S. Chen, “Terahertz quantum-cascade laser with active leaky-wave antenna,” Appl. Phys. Lett. 99(14), 141115 (2011).
[Crossref]

Kašalynas, I.

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

Khanna, S. P.

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
[Crossref]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Klaassen, T. O.

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

Krall, M.

S. Schönhuber, M. Brandstetter, T. Hisch, C. Deutsch, M. Krall, H. Detz, A. M. Andrews, G. Strasser, S. Rotter, and K. Unterrainer, “Random lasers for broadband directional emission,” Optica 3(10), 1035–1038 (2016).
[Crossref]

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

Kumar, S.

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15(1), 113–128 (2007).
[Crossref] [PubMed]

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 /spl times/ 240 microbolometer focal-plane array,” IEEE Photonics Technol. Lett. 18(13), 1415–1417 (2006).
[Crossref]

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

Lachab, M.

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
[Crossref]

Lalanne-Dera, J.

Lee, A. W.

Lee, A. W. M.

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 /spl times/ 240 microbolometer focal-plane array,” IEEE Photonics Technol. Lett. 18(13), 1415–1417 (2006).
[Crossref]

Leo, G.

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Letartre, X.

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

Levin, I. W.

E. N. Lewis, P. J. Treado, R. C. Reeder, G. M. Story, A. E. Dowrey, C. Marcott, and I. W. Levin, “Fourier transform spectroscopic imaging using an infrared focal-plane array detector,” Anal. Chem. 67(19), 3377–3381 (1995).
[Crossref] [PubMed]

Lewis, E. N.

E. N. Lewis, P. J. Treado, R. C. Reeder, G. M. Story, A. E. Dowrey, C. Marcott, and I. W. Levin, “Fourier transform spectroscopic imaging using an infrared focal-plane array detector,” Anal. Chem. 67(19), 3377–3381 (1995).
[Crossref] [PubMed]

Li, L.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

Linfield, E. H.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

J. A. Fan, M. A. Belkin, F. Capasso, S. P. Khanna, M. Lachab, A. G. Davies, and E. H. Linfield, “Wide-ridge metal-metal terahertz quantum cascade lasers with high-order lateral mode suppression,” Appl. Phys. Lett. 92(3), 031106 (2008).
[Crossref]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Ling, Y.

H. Cao, J. Y. Xu, Y. Ling, A. L. Burin, E. W. Seeling, X. Liu, and R. P. H. Chang, “Random lasers with coherent feedback,” IEEE J. Sel. Top. Quantum Electron. 9(1), 111–119 (2003).
[Crossref]

Liu, H. C.

A. Hugi, G. Villares, S. Blaser, H. C. Liu, and J. Faist, “Mid-infrared frequency comb based on a quantum cascade laser,” Nature 492(7428), 229–233 (2012).
[Crossref] [PubMed]

Liu, P.

Liu, X.

H. Cao, J. Y. Xu, Y. Ling, A. L. Burin, E. W. Seeling, X. Liu, and R. P. H. Chang, “Random lasers with coherent feedback,” IEEE J. Sel. Top. Quantum Electron. 9(1), 111–119 (2003).
[Crossref]

Mahler, L.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
[Crossref]

Maineult, W.

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Marcott, C.

E. N. Lewis, P. J. Treado, R. C. Reeder, G. M. Story, A. E. Dowrey, C. Marcott, and I. W. Levin, “Fourier transform spectroscopic imaging using an infrared focal-plane array detector,” Anal. Chem. 67(19), 3377–3381 (1995).
[Crossref] [PubMed]

Meilhan, J.

Nobile, M.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

Oden, J.

Orlova, E. E.

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

Qin, Q.

Reeder, R. C.

E. N. Lewis, P. J. Treado, R. C. Reeder, G. M. Story, A. E. Dowrey, C. Marcott, and I. W. Levin, “Fourier transform spectroscopic imaging using an infrared focal-plane array detector,” Anal. Chem. 67(19), 3377–3381 (1995).
[Crossref] [PubMed]

Reno, J. L.

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15(1), 113–128 (2007).
[Crossref] [PubMed]

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 /spl times/ 240 microbolometer focal-plane array,” IEEE Photonics Technol. Lett. 18(13), 1415–1417 (2006).
[Crossref]

Ritchie, D. A.

G. Xu, R. Colombelli, S. P. Khanna, A. Belarouci, X. Letartre, L. Li, E. H. Linfield, A. G. Davies, H. E. Beere, and D. A. Ritchie, “Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures,” Nat. Commun. 3, 952 (2012).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
[Crossref]

Y. Chassagneux, R. Colombelli, W. Maineult, S. Barbieri, H. E. Beere, D. A. Ritchie, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions,” Nature 457(7226), 174–178 (2009).
[Crossref] [PubMed]

Ronzani, A.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

Rösch, M.

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2015).
[Crossref]

Rotter, S.

Roux, J.-F.

Scalari, G.

M. Rösch, G. Scalari, M. Beck, and J. Faist, “Octave-spanning semiconductor laser,” Nat. Photonics 9(1), 42–47 (2015).
[Crossref]

M. I. Amanti, M. Fischer, G. Scalari, M. Beck, and J. Faist, “Low-divergence single-mode terahertz quantum cascade laser,” Nat. Photonics 3(10), 586–590 (2009).
[Crossref]

Schönhuber, S.

Schrenk, W.

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

Seeling, E. W.

H. Cao, J. Y. Xu, Y. Ling, A. L. Burin, E. W. Seeling, X. Liu, and R. P. H. Chang, “Random lasers with coherent feedback,” IEEE J. Sel. Top. Quantum Electron. 9(1), 111–119 (2003).
[Crossref]

Simoens, F.

Sirtori, C.

C. Sirtori, S. Barbieri, and R. Colombelli, “Wave engineering with THz quantum cascade lasers,” Nat. Photonics 7(9), 691–701 (2013).
[Crossref]

P. Gellie, W. Maineult, A. Andronico, G. Leo, C. Sirtori, S. Barbieri, Y. Chassagneux, J. R. Coudevylle, R. Colombelli, S. P. Khanna, E. H. Linfield, and A. G. Davies, “Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers,” J. Appl. Phys. 104(12), 124513 (2008).
[Crossref]

Story, G. M.

E. N. Lewis, P. J. Treado, R. C. Reeder, G. M. Story, A. E. Dowrey, C. Marcott, and I. W. Levin, “Fourier transform spectroscopic imaging using an infrared focal-plane array detector,” Anal. Chem. 67(19), 3377–3381 (1995).
[Crossref] [PubMed]

Strasser, G.

S. Schönhuber, M. Brandstetter, T. Hisch, C. Deutsch, M. Krall, H. Detz, A. M. Andrews, G. Strasser, S. Rotter, and K. Unterrainer, “Random lasers for broadband directional emission,” Optica 3(10), 1035–1038 (2016).
[Crossref]

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

Talora, V.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

Tavallaee, A. A.

A. A. Tavallaee, B. S. Williams, P. W. C. Hon, T. Itoh, and Q.-S. Chen, “Terahertz quantum-cascade laser with active leaky-wave antenna,” Appl. Phys. Lett. 99(14), 141115 (2011).
[Crossref]

Tonouchi, M.

M. Tonouchi, “Cutting-edge terahertz technology,” Nat. Photonics 1(2), 97–105 (2007).
[Crossref]

Treado, P. J.

E. N. Lewis, P. J. Treado, R. C. Reeder, G. M. Story, A. E. Dowrey, C. Marcott, and I. W. Levin, “Fourier transform spectroscopic imaging using an infrared focal-plane array detector,” Anal. Chem. 67(19), 3377–3381 (1995).
[Crossref] [PubMed]

Tredicucci, A.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
[Crossref]

Unterrainer, K.

S. Schönhuber, M. Brandstetter, T. Hisch, C. Deutsch, M. Krall, H. Detz, A. M. Andrews, G. Strasser, S. Rotter, and K. Unterrainer, “Random lasers for broadband directional emission,” Optica 3(10), 1035–1038 (2016).
[Crossref]

M. Brandstetter, M. Krall, C. Deutsch, H. Detz, A. M. Andrews, W. Schrenk, G. Strasser, and K. Unterrainer, “Influence of the facet type on the performance of terahertz quantum cascade lasers with double-metal waveguides,” Appl. Phys. Lett. 102(23), 231121 (2013).
[Crossref]

Villares, G.

A. Hugi, G. Villares, S. Blaser, H. C. Liu, and J. Faist, “Mid-infrared frequency comb based on a quantum cascade laser,” Nature 492(7428), 229–233 (2012).
[Crossref] [PubMed]

Vitiello, M. S.

M. S. Vitiello, M. Nobile, A. Ronzani, A. Tredicucci, F. Castellano, V. Talora, L. Li, E. H. Linfield, and A. G. Davies, “Photonic quasi-crystal terahertz lasers,” Nat. Commun. 5, 5884 (2014).
[Crossref] [PubMed]

Walther, C.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
[Crossref]

Williams, B. S.

A. A. Tavallaee, B. S. Williams, P. W. C. Hon, T. Itoh, and Q.-S. Chen, “Terahertz quantum-cascade laser with active leaky-wave antenna,” Appl. Phys. Lett. 99(14), 141115 (2011).
[Crossref]

B. S. Williams, “Terahertz quantum-cascade lasers,” Nat. Photonics 1(9), 517–525 (2007).
[Crossref]

S. Kumar, B. S. Williams, Q. Qin, A. W. Lee, Q. Hu, and J. L. Reno, “Surface-emitting distributed feedback terahertz quantum-cascade lasers in metal-metal waveguides,” Opt. Express 15(1), 113–128 (2007).
[Crossref] [PubMed]

A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Real-time imaging using a 4.3-THz quantum cascade laser and a 320 /spl times/ 240 microbolometer focal-plane array,” IEEE Photonics Technol. Lett. 18(13), 1415–1417 (2006).
[Crossref]

A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Beam patterns of terahertz quantum cascade lasers with subwavelength cavity dimensions,” Appl. Phys. Lett. 88(15), 151105 (2006).
[Crossref]

Witzigmann, B.

L. Mahler, A. Tredicucci, F. Beltram, C. Walther, J. Faist, B. Witzigmann, H. E. Beere, and D. A. Ritchie, “Vertically emitting microdisk lasers,” Nat. Photonics 3(1), 46–49 (2009).
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Xu, G.

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Figures (4)

Fig. 1
Fig. 1

(a) Scheme of the measurement setup. The QCL is mounted in a liquid helium flow cryostat, and the light is guided via a parabolic mirror into an FTIR spectrometer. The interferogram is recorded either with the internal single pixel DTGS detector or a microbolometer focal plane array (camera), placed at a distance of 2 cm before an intermediate focus after the interferometer. (b) Comparison of spectra obtained by the microbolometer camera (top) and the single pixel DTGS detector (bottom). The same laser modes are obtained with both measurements. Since the resolution of 0.075 cm−1 is only determined by the travelling distance of the moving interferometer mirror, it is the same for both measurements.

Fig. 2
Fig. 2

3-dimensional finite-element calculations of a Fabry-Pérot cavity. Spatial distribution of the z-component of the electric field Ez in the vertical center (z-direction) of the cavity of a fundamental TM0 mode (a) and the first higher order lateral mode TM1, showing two lateral maxima (b). In (c) and (d), the corresponding far-fields are illustrated. The dashed rectangles indicate the observable section of the far-field with the used measurement setup, which is limited by the parabolic mirror (focal length of 5 cm) which couples the radiation into the spectrometer. (e) Illustration of a double-metal waveguide with etched facets.

Fig. 3
Fig. 3

Spectrally resolved far-field measurements of a laser with a Fabry-Pérot cavity. (a) Spectrum of the laser obtained using a single pixel DTGS detector. The vertical lines indicate the Fabry-Pérot spacing for a cavity with a length of 1000 µm and a group index of n = 4.4 (representing the InGaAs active region). Modes labelled A, B, C and D perfectly align with this grid and thus correspond to the same mode type. E and F are located in between, though at the same relative positions with respect to the grid, and thus belong to a different mode type. (b) A single lobed far-field is observed for modes A, B, C and D, which thus are attributed to be of TM0 type. Far-fields corresponding to E and F show 2 lobes with a minimum at the center, as expected for TM1 modes. The measurements are thus in good agreement with the simulations presented in Fig. 2.

Fig. 4
Fig. 4

(a) Illustration of the investigated random laser cavity, consisting of a circular resonator with randomly placed holes, which act as scattering- and outcoupling elements. (b) Measured spectrum of a device with 34% filling fraction, obtained using a single pixel DTGS detector. (c) Spectrally resolved far-fields corresponding to the modes in (b). Although each mode shows an individual emission pattern, some components radiate in the same direction. (d) Incoherent superposition of the far-fields in (c), showing a very good agreement with the spectrally integrated measurements depicted in (e), obtained using a single pixel detector, which is scanned at a distance of 6 cm in front of the device.

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