Abstract

We demonstrate laser action in diode-pumped microchip monolithic cavity channel waveguides of Yb:KGd(WO4)2 and Yb:KY(WO4)2 that were fabricated by ultrafast laser writing. The maximum output power achieved was 18.6 mW with a threshold of approximately 100 mW from an Yb:KGd(WO4)2 waveguide laser operating at 1023 nm. The propagation losses for this waveguide structure were measured to be 1.9 dBcm−1.

© 2009 OSA

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    [CrossRef]
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    [CrossRef] [PubMed]
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  18. D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
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    [CrossRef]
  21. S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
    [CrossRef]
  22. P. C. Mogensen, P. M. Smowton, and P. Blood, “Measurement of optical mode loss in visible emitting lasers,” Appl. Phys. Lett. 71(14), 1975–1977 (1997).
    [CrossRef]

2009 (2)

F. M. Bain, A. A. Lagatsky, S. V. Kurilchick, V. E. Kisel, S. A. Guretsky, A. M. Luginets, N. A. Kalanda, I. M. Kolesova, N. V. Kuleshov, W. Sibbett, and C. T. A. Brown, “Continuous-wave and Q-switched operation of a compact, diode-pumped Yb3+:KY(WO4)2 planar waveguide laser,” Opt. Express 17(3), 1666–1670 (2009).
[CrossRef] [PubMed]

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

2008 (5)

G. A. Torchia, A. Rodenas, A. Benayas, E. Cantelar, L. Roso, and D. Jaque, “Highly efficient laser action in femtosecond-written Nd: yttrium aluminum garnet ceramic waveguides,” Appl. Phys. Lett. 92(11), 111103 (2008).
[CrossRef]

R. R. Gattass and E. Mazur, “Femtosecond laser micromachining in transparent materials,” Nat. Photonics 2(4), 219–225 (2008).
[CrossRef]

G. D. Marshall, P. Dekker, M. Ams, J. A. Piper, and M. J. Withford, “Directly written monolithic waveguide laser incorporating a distributed feedback waveguide-Bragg grating,” Opt. Lett. 33(9), 956–958 (2008).
[CrossRef] [PubMed]

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

2007 (4)

G. Della Valle, S. Taccheo, R. Osellame, A. Festa, G. Cerullo, and P. Laporta, “1.5 mum single longitudinal mode waveguide laser fabricated by femtosecond laser writing,” Opt. Express 15(6), 3190–3194 (2007).
[CrossRef] [PubMed]

M. Pollnau, Y. E. Romanyuk, F. Gardillou, C. N. Borca, U. Griebner, S. Rivier, and V. Petrov, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices,” IEEE J. Sel. Top. Quantum Electron. 13(3), 661–671 (2007).
[CrossRef]

C. N. Borca, V. Apostolopoulos, F. Gardillou, H. G. Limberger, M. Pollnau, and R. P. Salathe, “Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation,” Appl. Surf. Sci. 253(19), 8300–8303 (2007).
[CrossRef]

F. Gardillou, Y. E. Romanyuk, C. N. Borca, R. P. Salathé, and M. Pollnau, “Lu, Gd codoped KY(WO(4))(2):Yb epitaxial layers: towards integrated optics based on KY(WO(4))(2).,” Opt. Lett. 32(5), 488–490 (2007).
[CrossRef] [PubMed]

2006 (2)

Y. E. Romanyuk, C. N. Borca, M. Pollnau, S. Rivier, V. Petrov, and U. Griebner, “Yb-doped KY(WO4)2 planar waveguide laser,” Opt. Lett. 31(1), 53–55 (2006).
[CrossRef] [PubMed]

R. R. Thomson, S. Campbell, I. J. Blewett, A. K. Kar, and D. T. Reid, “Optical waveguide fabrication in z-cut lithium niobate (LiNbO3) using femtosecond pulses in the low repetition rate regime,” Appl. Phys. Lett. 88(11), 111109 (2006).
[CrossRef]

2005 (1)

2004 (2)

K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, “Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals,” Appl. Phys. Lett. 84(3), 311–313 (2004).
[CrossRef]

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

1999 (1)

A. A. Lagatsky, N. V. Kuleshov, and V. P. Mikhailov, “Diode-pumped CW lasing of Yb:KYW and Yb:KGW,” Opt. Commun. 165(1-3), 71–75 (1999).
[CrossRef]

1997 (2)

P. C. Mogensen, P. M. Smowton, and P. Blood, “Measurement of optical mode loss in visible emitting lasers,” Appl. Phys. Lett. 71(14), 1975–1977 (1997).
[CrossRef]

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

1996 (1)

Aitchison, J. S.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Ams, M.

Apostolopoulos, V.

C. N. Borca, V. Apostolopoulos, F. Gardillou, H. G. Limberger, M. Pollnau, and R. P. Salathe, “Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation,” Appl. Surf. Sci. 253(19), 8300–8303 (2007).
[CrossRef]

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Aravazhi, S.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Bain, F. M.

Benayas, A.

G. A. Torchia, A. Rodenas, A. Benayas, E. Cantelar, L. Roso, and D. Jaque, “Highly efficient laser action in femtosecond-written Nd: yttrium aluminum garnet ceramic waveguides,” Appl. Phys. Lett. 92(11), 111103 (2008).
[CrossRef]

Bernhardi, E.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Blewett, I. J.

R. R. Thomson, S. Campbell, I. J. Blewett, A. K. Kar, and D. T. Reid, “Optical waveguide fabrication in z-cut lithium niobate (LiNbO3) using femtosecond pulses in the low repetition rate regime,” Appl. Phys. Lett. 88(11), 111109 (2006).
[CrossRef]

Blood, P.

P. C. Mogensen, P. M. Smowton, and P. Blood, “Measurement of optical mode loss in visible emitting lasers,” Appl. Phys. Lett. 71(14), 1975–1977 (1997).
[CrossRef]

Bookey, H. T.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

Borca, C. N.

M. Pollnau, Y. E. Romanyuk, F. Gardillou, C. N. Borca, U. Griebner, S. Rivier, and V. Petrov, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices,” IEEE J. Sel. Top. Quantum Electron. 13(3), 661–671 (2007).
[CrossRef]

C. N. Borca, V. Apostolopoulos, F. Gardillou, H. G. Limberger, M. Pollnau, and R. P. Salathe, “Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation,” Appl. Surf. Sci. 253(19), 8300–8303 (2007).
[CrossRef]

F. Gardillou, Y. E. Romanyuk, C. N. Borca, R. P. Salathé, and M. Pollnau, “Lu, Gd codoped KY(WO(4))(2):Yb epitaxial layers: towards integrated optics based on KY(WO(4))(2).,” Opt. Lett. 32(5), 488–490 (2007).
[CrossRef] [PubMed]

Y. E. Romanyuk, C. N. Borca, M. Pollnau, S. Rivier, V. Petrov, and U. Griebner, “Yb-doped KY(WO4)2 planar waveguide laser,” Opt. Lett. 31(1), 53–55 (2006).
[CrossRef] [PubMed]

Brown, C. T. A.

Campbell, S.

R. R. Thomson, S. Campbell, I. J. Blewett, A. K. Kar, and D. T. Reid, “Optical waveguide fabrication in z-cut lithium niobate (LiNbO3) using femtosecond pulses in the low repetition rate regime,” Appl. Phys. Lett. 88(11), 111109 (2006).
[CrossRef]

Cantelar, E.

G. A. Torchia, A. Rodenas, A. Benayas, E. Cantelar, L. Roso, and D. Jaque, “Highly efficient laser action in femtosecond-written Nd: yttrium aluminum garnet ceramic waveguides,” Appl. Phys. Lett. 92(11), 111103 (2008).
[CrossRef]

Cerullo, G.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

G. Della Valle, S. Taccheo, R. Osellame, A. Festa, G. Cerullo, and P. Laporta, “1.5 mum single longitudinal mode waveguide laser fabricated by femtosecond laser writing,” Opt. Express 15(6), 3190–3194 (2007).
[CrossRef] [PubMed]

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Chiodo, N.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

Colomb, T.

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Davis, K. M.

Dekker, P.

Della Valle, G.

Depeursinge, C.

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Diening, A.

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Eaton, S. M.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Festa, A.

Gardillou, F.

F. Gardillou, Y. E. Romanyuk, C. N. Borca, R. P. Salathé, and M. Pollnau, “Lu, Gd codoped KY(WO(4))(2):Yb epitaxial layers: towards integrated optics based on KY(WO(4))(2).,” Opt. Lett. 32(5), 488–490 (2007).
[CrossRef] [PubMed]

C. N. Borca, V. Apostolopoulos, F. Gardillou, H. G. Limberger, M. Pollnau, and R. P. Salathe, “Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation,” Appl. Surf. Sci. 253(19), 8300–8303 (2007).
[CrossRef]

M. Pollnau, Y. E. Romanyuk, F. Gardillou, C. N. Borca, U. Griebner, S. Rivier, and V. Petrov, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices,” IEEE J. Sel. Top. Quantum Electron. 13(3), 661–671 (2007).
[CrossRef]

Gattass, R. R.

R. R. Gattass and E. Mazur, “Femtosecond laser micromachining in transparent materials,” Nat. Photonics 2(4), 219–225 (2008).
[CrossRef]

Geskus, D.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Griebner, U.

M. Pollnau, Y. E. Romanyuk, F. Gardillou, C. N. Borca, U. Griebner, S. Rivier, and V. Petrov, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices,” IEEE J. Sel. Top. Quantum Electron. 13(3), 661–671 (2007).
[CrossRef]

Y. E. Romanyuk, C. N. Borca, M. Pollnau, S. Rivier, V. Petrov, and U. Griebner, “Yb-doped KY(WO4)2 planar waveguide laser,” Opt. Lett. 31(1), 53–55 (2006).
[CrossRef] [PubMed]

Grivas, C.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Günther, D.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Guretsky, S. A.

Hametner, K.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Harkema, S.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Helmy, A. S.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Herman, P. R.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Heumann, E.

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Hirano, M.

K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, “Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals,” Appl. Phys. Lett. 84(3), 311–313 (2004).
[CrossRef]

Hirao, K.

Hnatovsky, C.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Hosono, H.

K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, “Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals,” Appl. Phys. Lett. 84(3), 311–313 (2004).
[CrossRef]

Huber, G.

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Iyer, R.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Jaque, D.

G. A. Torchia, A. Rodenas, A. Benayas, E. Cantelar, L. Roso, and D. Jaque, “Highly efficient laser action in femtosecond-written Nd: yttrium aluminum garnet ceramic waveguides,” Appl. Phys. Lett. 92(11), 111103 (2008).
[CrossRef]

Jensen, T.

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Jha, A.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

Kalanda, N. A.

Kamiya, T.

K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, “Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals,” Appl. Phys. Lett. 84(3), 311–313 (2004).
[CrossRef]

Kar, A. K.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

R. R. Thomson, S. Campbell, I. J. Blewett, A. K. Kar, and D. T. Reid, “Optical waveguide fabrication in z-cut lithium niobate (LiNbO3) using femtosecond pulses in the low repetition rate regime,” Appl. Phys. Lett. 88(11), 111109 (2006).
[CrossRef]

Kawamura, K.

K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, “Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals,” Appl. Phys. Lett. 84(3), 311–313 (2004).
[CrossRef]

Khrushchev, I.

Kisel, V. E.

Kolesova, I. M.

Kraemer, D.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Kuleshov, N. V.

F. M. Bain, A. A. Lagatsky, S. V. Kurilchick, V. E. Kisel, S. A. Guretsky, A. M. Luginets, N. A. Kalanda, I. M. Kolesova, N. V. Kuleshov, W. Sibbett, and C. T. A. Brown, “Continuous-wave and Q-switched operation of a compact, diode-pumped Yb3+:KY(WO4)2 planar waveguide laser,” Opt. Express 17(3), 1666–1670 (2009).
[CrossRef] [PubMed]

A. A. Lagatsky, N. V. Kuleshov, and V. P. Mikhailov, “Diode-pumped CW lasing of Yb:KYW and Yb:KGW,” Opt. Commun. 165(1-3), 71–75 (1999).
[CrossRef]

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Kurilchick, S. V.

Kurobori, T.

K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, “Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals,” Appl. Phys. Lett. 84(3), 311–313 (2004).
[CrossRef]

Lagatsky, A. A.

F. M. Bain, A. A. Lagatsky, S. V. Kurilchick, V. E. Kisel, S. A. Guretsky, A. M. Luginets, N. A. Kalanda, I. M. Kolesova, N. V. Kuleshov, W. Sibbett, and C. T. A. Brown, “Continuous-wave and Q-switched operation of a compact, diode-pumped Yb3+:KY(WO4)2 planar waveguide laser,” Opt. Express 17(3), 1666–1670 (2009).
[CrossRef] [PubMed]

A. A. Lagatsky, N. V. Kuleshov, and V. P. Mikhailov, “Diode-pumped CW lasing of Yb:KYW and Yb:KGW,” Opt. Commun. 165(1-3), 71–75 (1999).
[CrossRef]

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Laporta, P.

G. Della Valle, S. Taccheo, R. Osellame, A. Festa, G. Cerullo, and P. Laporta, “1.5 mum single longitudinal mode waveguide laser fabricated by femtosecond laser writing,” Opt. Express 15(6), 3190–3194 (2007).
[CrossRef] [PubMed]

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Laversenne, L.

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Limberger, H. G.

C. N. Borca, V. Apostolopoulos, F. Gardillou, H. G. Limberger, M. Pollnau, and R. P. Salathe, “Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation,” Appl. Surf. Sci. 253(19), 8300–8303 (2007).
[CrossRef]

Luginets, A. M.

Marshall, G. D.

Mazur, E.

R. R. Gattass and E. Mazur, “Femtosecond laser micromachining in transparent materials,” Nat. Photonics 2(4), 219–225 (2008).
[CrossRef]

Merchant, C. A.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Mikhailov, V. P.

A. A. Lagatsky, N. V. Kuleshov, and V. P. Mikhailov, “Diode-pumped CW lasing of Yb:KYW and Yb:KGW,” Opt. Commun. 165(1-3), 71–75 (1999).
[CrossRef]

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Miller, R. J. D.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Mitchell, J.

Miura, K.

Mogensen, P. C.

P. C. Mogensen, P. M. Smowton, and P. Blood, “Measurement of optical mode loss in visible emitting lasers,” Appl. Phys. Lett. 71(14), 1975–1977 (1997).
[CrossRef]

Okhrimchuk, A. G.

Osellame, R.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

G. Della Valle, S. Taccheo, R. Osellame, A. Festa, G. Cerullo, and P. Laporta, “1.5 mum single longitudinal mode waveguide laser fabricated by femtosecond laser writing,” Opt. Express 15(6), 3190–3194 (2007).
[CrossRef] [PubMed]

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Petrov, V.

M. Pollnau, Y. E. Romanyuk, F. Gardillou, C. N. Borca, U. Griebner, S. Rivier, and V. Petrov, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices,” IEEE J. Sel. Top. Quantum Electron. 13(3), 661–671 (2007).
[CrossRef]

Y. E. Romanyuk, C. N. Borca, M. Pollnau, S. Rivier, V. Petrov, and U. Griebner, “Yb-doped KY(WO4)2 planar waveguide laser,” Opt. Lett. 31(1), 53–55 (2006).
[CrossRef] [PubMed]

Piper, J. A.

Pollnau, M.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

C. N. Borca, V. Apostolopoulos, F. Gardillou, H. G. Limberger, M. Pollnau, and R. P. Salathe, “Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation,” Appl. Surf. Sci. 253(19), 8300–8303 (2007).
[CrossRef]

M. Pollnau, Y. E. Romanyuk, F. Gardillou, C. N. Borca, U. Griebner, S. Rivier, and V. Petrov, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices,” IEEE J. Sel. Top. Quantum Electron. 13(3), 661–671 (2007).
[CrossRef]

F. Gardillou, Y. E. Romanyuk, C. N. Borca, R. P. Salathé, and M. Pollnau, “Lu, Gd codoped KY(WO(4))(2):Yb epitaxial layers: towards integrated optics based on KY(WO(4))(2).,” Opt. Lett. 32(5), 488–490 (2007).
[CrossRef] [PubMed]

Y. E. Romanyuk, C. N. Borca, M. Pollnau, S. Rivier, V. Petrov, and U. Griebner, “Yb-doped KY(WO4)2 planar waveguide laser,” Opt. Lett. 31(1), 53–55 (2006).
[CrossRef] [PubMed]

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Psaila, N. D.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

Reid, D. T.

R. R. Thomson, S. Campbell, I. J. Blewett, A. K. Kar, and D. T. Reid, “Optical waveguide fabrication in z-cut lithium niobate (LiNbO3) using femtosecond pulses in the low repetition rate regime,” Appl. Phys. Lett. 88(11), 111109 (2006).
[CrossRef]

Rivier, S.

M. Pollnau, Y. E. Romanyuk, F. Gardillou, C. N. Borca, U. Griebner, S. Rivier, and V. Petrov, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices,” IEEE J. Sel. Top. Quantum Electron. 13(3), 661–671 (2007).
[CrossRef]

Y. E. Romanyuk, C. N. Borca, M. Pollnau, S. Rivier, V. Petrov, and U. Griebner, “Yb-doped KY(WO4)2 planar waveguide laser,” Opt. Lett. 31(1), 53–55 (2006).
[CrossRef] [PubMed]

Rodenas, A.

G. A. Torchia, A. Rodenas, A. Benayas, E. Cantelar, L. Roso, and D. Jaque, “Highly efficient laser action in femtosecond-written Nd: yttrium aluminum garnet ceramic waveguides,” Appl. Phys. Lett. 92(11), 111103 (2008).
[CrossRef]

Romanyuk, Y. E.

Roso, L.

G. A. Torchia, A. Rodenas, A. Benayas, E. Cantelar, L. Roso, and D. Jaque, “Highly efficient laser action in femtosecond-written Nd: yttrium aluminum garnet ceramic waveguides,” Appl. Phys. Lett. 92(11), 111103 (2008).
[CrossRef]

Salathe, R. P.

C. N. Borca, V. Apostolopoulos, F. Gardillou, H. G. Limberger, M. Pollnau, and R. P. Salathe, “Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation,” Appl. Surf. Sci. 253(19), 8300–8303 (2007).
[CrossRef]

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

Salathé, R. P.

Shcherbitsky, V. G.

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Shen, S.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

Shestakov, A. V.

Sibbett, W.

Smowton, P. M.

P. C. Mogensen, P. M. Smowton, and P. Blood, “Measurement of optical mode loss in visible emitting lasers,” Appl. Phys. Lett. 71(14), 1975–1977 (1997).
[CrossRef]

Sugimoto, N.

Taccheo, S.

Takamizu, D.

K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, “Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals,” Appl. Phys. Lett. 84(3), 311–313 (2004).
[CrossRef]

Taylor, R. S.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Thomson, R. R.

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

R. R. Thomson, S. Campbell, I. J. Blewett, A. K. Kar, and D. T. Reid, “Optical waveguide fabrication in z-cut lithium niobate (LiNbO3) using femtosecond pulses in the low repetition rate regime,” Appl. Phys. Lett. 88(11), 111109 (2006).
[CrossRef]

Torchia, G. A.

G. A. Torchia, A. Rodenas, A. Benayas, E. Cantelar, L. Roso, and D. Jaque, “Highly efficient laser action in femtosecond-written Nd: yttrium aluminum garnet ceramic waveguides,” Appl. Phys. Lett. 92(11), 111103 (2008).
[CrossRef]

Withford, M. J.

Wörhoff, K.

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Zilkie, A. J.

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

Appl. Phys. B (1)

N. V. Kuleshov, A. A. Lagatsky, V. G. Shcherbitsky, V. P. Mikhailov, E. Heumann, T. Jensen, A. Diening, and G. Huber, “CW laser performance of Yb and Er,Yb doped tungstates,” Appl. Phys. B 64(4), 409–413 (1997).
[CrossRef]

Appl. Phys. Lett. (6)

G. A. Torchia, A. Rodenas, A. Benayas, E. Cantelar, L. Roso, and D. Jaque, “Highly efficient laser action in femtosecond-written Nd: yttrium aluminum garnet ceramic waveguides,” Appl. Phys. Lett. 92(11), 111103 (2008).
[CrossRef]

V. Apostolopoulos, L. Laversenne, T. Colomb, C. Depeursinge, R. P. Salathe, M. Pollnau, R. Osellame, G. Cerullo, and P. Laporta, “Femtosecond-irradiation-induced refractive-index changes and channel waveguiding in bulk Ti3+:Sapphire,” Appl. Phys. Lett. 85(7), 1122–1124 (2004).
[CrossRef]

R. R. Thomson, S. Campbell, I. J. Blewett, A. K. Kar, and D. T. Reid, “Optical waveguide fabrication in z-cut lithium niobate (LiNbO3) using femtosecond pulses in the low repetition rate regime,” Appl. Phys. Lett. 88(11), 111109 (2006).
[CrossRef]

K. Kawamura, M. Hirano, T. Kurobori, D. Takamizu, T. Kamiya, and H. Hosono, “Femtosecond-laser-encoded distributed-feedback color center laser in lithium fluoride single crystals,” Appl. Phys. Lett. 84(3), 311–313 (2004).
[CrossRef]

S. M. Eaton, C. A. Merchant, R. Iyer, A. J. Zilkie, A. S. Helmy, J. S. Aitchison, P. R. Herman, D. Kraemer, R. J. D. Miller, C. Hnatovsky, and R. S. Taylor, “Raman gain from waveguides inscribed in KGd(WO4)2 by high repetition rate femtosecond laser,” Appl. Phys. Lett. 92(8), 81105–81107 (2008).
[CrossRef]

P. C. Mogensen, P. M. Smowton, and P. Blood, “Measurement of optical mode loss in visible emitting lasers,” Appl. Phys. Lett. 71(14), 1975–1977 (1997).
[CrossRef]

Appl. Surf. Sci. (1)

C. N. Borca, V. Apostolopoulos, F. Gardillou, H. G. Limberger, M. Pollnau, and R. P. Salathe, “Buried channel waveguides in Yb-doped KY(WO4)2 fabricated by femtosecond laser irradiation,” Appl. Surf. Sci. 253(19), 8300–8303 (2007).
[CrossRef]

IEEE J. Sel. Top. Quantum Electron. (1)

M. Pollnau, Y. E. Romanyuk, F. Gardillou, C. N. Borca, U. Griebner, S. Rivier, and V. Petrov, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices,” IEEE J. Sel. Top. Quantum Electron. 13(3), 661–671 (2007).
[CrossRef]

IEEE Photon. Technol. Lett. (1)

N. D. Psaila, R. R. Thomson, H. T. Bookey, N. Chiodo, S. Shen, R. Osellame, G. Cerullo, A. Jha, and A. K. Kar, “Er:Yb-doped oxyfluoride silicate glass waveguide laser fabricated using ultrafast laser inscription,” IEEE Photon. Technol. Lett. 20(2), 126–128 (2008).
[CrossRef]

Laser Phys. Lett. (1)

D. Geskus, S. Aravazhi, E. Bernhardi, C. Grivas, S. Harkema, K. Hametner, D. Günther, K. Wörhoff, and M. Pollnau, “D Günther K. Worhoff and M. Pollnau, “Low-threshold highly efficient Gd3+, Lu3+ co-doped KY(WO4)2:Yb3+ planar waveguide lasers,” Laser Phys. Lett. 6(11), 800–805 (2009).
[CrossRef]

Nat. Photonics (1)

R. R. Gattass and E. Mazur, “Femtosecond laser micromachining in transparent materials,” Nat. Photonics 2(4), 219–225 (2008).
[CrossRef]

Opt. Commun. (1)

A. A. Lagatsky, N. V. Kuleshov, and V. P. Mikhailov, “Diode-pumped CW lasing of Yb:KYW and Yb:KGW,” Opt. Commun. 165(1-3), 71–75 (1999).
[CrossRef]

Opt. Express (2)

Opt. Lett. (5)

Other (2)

J. Siebenmorgen, T. Calmano, K. Petermann, and G. Huber, “Fabrication of a Stress-Induced Nd:YAG Channel Waveguide Laser using fs-Laser Pulses,” Talk MB29 presented at Advanced Solid-State Photonics in Denver, Colarado (2009).

D. Geskus, J. D. B. Bradley, S. Aravazhi, K. Worhoff, and M. Pollnau, “Poor man's channel waveguide laser: KY(WO4)2:Yb,” 2008 Conference on Lasers and Electro-Optics & Quantum Electronics and Laser Science Conference, Vols 1–9, 1664–1665 (2008).

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Figures (8)

Fig. 1
Fig. 1

Representative microscope images of Yb:KGdW waveguide end facets written at different pulse energies and scan separations. In (b,c) cracking between the two written regions of a single structure can be observed, as is cracking between adjacent sets of structures in (d).

Fig. 2
Fig. 2

Microscope image of Yb:KYW waveguide end facets.

Fig. 3
Fig. 3

Laser cavity experimental setup. Obj1 - × 30 objective; Obj2, Obj3 - × 10 objective; F.I. - Faraday isolator; M1 - high reflecting mirror at 1010-1100 nm with high transmission at 980 nm; M2 - 1%, 3% or 5% output coupler.

Fig. 4
Fig. 4

Microscope images of Yb:KGdW waveguide end facets with guiding modes for Epump||a. (a) and (b) show guiding above and below cracked regions. (c) shows poor guiding below the modified regions when no cracking occurred.

Fig. 5
Fig. 5

Yb:KGdW lasing power as a function of pump power for 1%, 3% and 5% output couplers for (a) E||a polarization and (b) E||b polarization. Inset: Far-field beam profile.

Fig. 6
Fig. 6

Microscope images of Yb:KGdW end facets with guiding modes (a) to the left, (b) in the central region, and (c) to the right for E||b. The images relate to structures written with a pulse energy of 369 nJ. (a) and (c) are for a scan separation of 20 µm, whereas (b) is for a scan separation of 25 µm where no cracking occurred between the two written tracks.

Fig. 7
Fig. 7

Representative examples of “poor” guiding in Yb:KYW structures for E||a polarization written at various pulse energies.

Fig. 8
Fig. 8

Microscope images of Yb:KYW end facets with guiding modes (a) to the left, (b) in the central region, and (c) to the right, for E||b pump polarization. All structures were written with a pulse energy of 392 nJ and a scan separation of 20 µm.

Tables (1)

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Table 1 Summary of optimized lasing results for each crystal. The scan separation is 20 µm in each case for guiding in a side region. The maximum output power was achieved using a 5% output coupler but, as expected, the lowest threshold was reached with an 1% output coupler.

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