Abstract

We present the coherent beam combination of four 2100 nm holmium amplifiers with their phase controlled through acousto-optic modulators driven by the RF output of direct digital synthesizer chips. Phase alignment was achieved through the use of a field programmable gate array based stochastic parallel gradient descent algorithm.

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References

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  1. A. Hemming, N. Simakov, J. Haub, and A. Carter, “High power resonantly pumped holmium-doped fibre sources,” Proc. SPIE 8982, 898202 (2014).
    [Crossref]
  2. N. Simakov, Z. Li, Y. Jung, J. M. Daniel, P. Barua, P. C. Shardlow, S. Liang, J. K. Sahu, A. Hemming, W. A. Clarkson, S.-U. Alam, and D. J. Richardson, “High gain holmium-doped fibre amplifiers,” Opt. Express 24(13), 13946–13956 (2016).
    [Crossref] [PubMed]
  3. A. Brignon, Coherent laser beam combining (John Wiley & Sons, 2013).
  4. L. Shah, R. A. Sims, P. Kadwani, C. C. Willis, J. B. Bradford, A. Sincore, and M. Richardson, “High-power spectral beam combining of linearly polarized Tm:fiber lasers,” Appl. Opt. 54(4), 757–762 (2015).
    [Crossref] [PubMed]
  5. P. Honzatko, Y. Baravets, F. Todorov, P. Peterka, and M. Becker, “Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers,” Laser Phys. Lett. 10(9), 095104 (2013).
    [Crossref]
  6. G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
    [Crossref]
  7. S. McNaught, H. Komine, B. Weiss, R. Simpson, A. Johnson, J. Machan, C. Asman, M. Weber, G. Jones, M. Valley, A. Jankevics, D. Burchman, M. McClellan, J. Sollee, J. Marmo, and H. Injeyan, “100 kW Coherently Combined Slab MOPAs,” Proc. OSA/CLEO/IQEC (2009).
    [Crossref]
  8. B. Pulford, LOCSET phase locking: operation, disgnostics, and applications (The University of New Mexico, 2011).
  9. P. F. Ma, P. Zhou, R. T. Su, Y. X. Ma, and Z. J. Liu, “Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique,” Laser Phys. Lett. 9(6), 456–458 (2012).
    [Crossref]
  10. L. Liu and M. A. Vorontsov, “Phase-Locking of Tiled Fiber Array using SPGD Feedback Controller,” Proc. SPIE 5895, 58950P (2005).
    [Crossref]
  11. T. Weyrauch, M. Vorontsov, J. Mangano, V. Ovchinnikov, D. Bricker, E. Polnau, and A. Rostov, “Deep turbulence effects mitigation with coherent combining of 21 laser beams over 7 km,” Opt. Lett. 41(4), 840–843 (2016).
    [Crossref] [PubMed]
  12. S. J. Augst, T. Y. Fan, and A. Sanchez, “Coherent beam combining and phase noise measurements of ytterbium fiber amplifiers,” Opt. Lett. 29(5), 474–476 (2004).
    [Crossref] [PubMed]
  13. R. Uberna, A. Bratcher, and B. G. Tiemann, “Power scaling of a fiber master oscillator power amplifier system using a coherent polarization beam combination,” Appl. Opt. 49(35), 6762–6765 (2010).
    [Crossref] [PubMed]
  14. D. Y. Stepanov and L. Corena, “Bragg grating fabrication with wide range coarse and fine wavelength control,” Opt. Express 22(22), 27309–27320 (2014).
    [Crossref] [PubMed]

2016 (2)

2015 (1)

2014 (2)

A. Hemming, N. Simakov, J. Haub, and A. Carter, “High power resonantly pumped holmium-doped fibre sources,” Proc. SPIE 8982, 898202 (2014).
[Crossref]

D. Y. Stepanov and L. Corena, “Bragg grating fabrication with wide range coarse and fine wavelength control,” Opt. Express 22(22), 27309–27320 (2014).
[Crossref] [PubMed]

2013 (1)

P. Honzatko, Y. Baravets, F. Todorov, P. Peterka, and M. Becker, “Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers,” Laser Phys. Lett. 10(9), 095104 (2013).
[Crossref]

2012 (1)

P. F. Ma, P. Zhou, R. T. Su, Y. X. Ma, and Z. J. Liu, “Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique,” Laser Phys. Lett. 9(6), 456–458 (2012).
[Crossref]

2011 (1)

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

2010 (1)

2005 (1)

L. Liu and M. A. Vorontsov, “Phase-Locking of Tiled Fiber Array using SPGD Feedback Controller,” Proc. SPIE 5895, 58950P (2005).
[Crossref]

2004 (1)

Alam, S.-U.

Augst, S. J.

Baravets, Y.

P. Honzatko, Y. Baravets, F. Todorov, P. Peterka, and M. Becker, “Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers,” Laser Phys. Lett. 10(9), 095104 (2013).
[Crossref]

Barua, P.

Becker, M.

P. Honzatko, Y. Baravets, F. Todorov, P. Peterka, and M. Becker, “Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers,” Laser Phys. Lett. 10(9), 095104 (2013).
[Crossref]

Book, L. D.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Bradford, J. B.

Bratcher, A.

Bricker, D.

Carter, A.

A. Hemming, N. Simakov, J. Haub, and A. Carter, “High power resonantly pumped holmium-doped fibre sources,” Proc. SPIE 8982, 898202 (2014).
[Crossref]

Clarkson, W. A.

Corena, L.

Daniel, J. M.

Fan, T. Y.

Goodno, G. D.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Haub, J.

A. Hemming, N. Simakov, J. Haub, and A. Carter, “High power resonantly pumped holmium-doped fibre sources,” Proc. SPIE 8982, 898202 (2014).
[Crossref]

Hemming, A.

Honzatko, P.

P. Honzatko, Y. Baravets, F. Todorov, P. Peterka, and M. Becker, “Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers,” Laser Phys. Lett. 10(9), 095104 (2013).
[Crossref]

Jung, Y.

Kadwani, P.

Li, Z.

Liang, S.

Liu, L.

L. Liu and M. A. Vorontsov, “Phase-Locking of Tiled Fiber Array using SPGD Feedback Controller,” Proc. SPIE 5895, 58950P (2005).
[Crossref]

Liu, Z. J.

P. F. Ma, P. Zhou, R. T. Su, Y. X. Ma, and Z. J. Liu, “Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique,” Laser Phys. Lett. 9(6), 456–458 (2012).
[Crossref]

Ma, P. F.

P. F. Ma, P. Zhou, R. T. Su, Y. X. Ma, and Z. J. Liu, “Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique,” Laser Phys. Lett. 9(6), 456–458 (2012).
[Crossref]

Ma, Y. X.

P. F. Ma, P. Zhou, R. T. Su, Y. X. Ma, and Z. J. Liu, “Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique,” Laser Phys. Lett. 9(6), 456–458 (2012).
[Crossref]

Mangano, J.

Ovchinnikov, V.

Peterka, P.

P. Honzatko, Y. Baravets, F. Todorov, P. Peterka, and M. Becker, “Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers,” Laser Phys. Lett. 10(9), 095104 (2013).
[Crossref]

Polnau, E.

Richardson, D. J.

Richardson, M.

Rostov, A.

Rothenberg, J. E.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Sahu, J. K.

Sanchez, A.

Shah, L.

Shardlow, P. C.

Simakov, N.

Sims, R. A.

Sincore, A.

Stepanov, D. Y.

Su, R. T.

P. F. Ma, P. Zhou, R. T. Su, Y. X. Ma, and Z. J. Liu, “Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique,” Laser Phys. Lett. 9(6), 456–458 (2012).
[Crossref]

Tiemann, B. G.

Todorov, F.

P. Honzatko, Y. Baravets, F. Todorov, P. Peterka, and M. Becker, “Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers,” Laser Phys. Lett. 10(9), 095104 (2013).
[Crossref]

Uberna, R.

Vorontsov, M.

Vorontsov, M. A.

L. Liu and M. A. Vorontsov, “Phase-Locking of Tiled Fiber Array using SPGD Feedback Controller,” Proc. SPIE 5895, 58950P (2005).
[Crossref]

Weber, M. E.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Weiss, S. B.

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Weyrauch, T.

Willis, C. C.

Zhou, P.

P. F. Ma, P. Zhou, R. T. Su, Y. X. Ma, and Z. J. Liu, “Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique,” Laser Phys. Lett. 9(6), 456–458 (2012).
[Crossref]

Appl. Opt. (2)

Laser Phys. Lett. (2)

P. Honzatko, Y. Baravets, F. Todorov, P. Peterka, and M. Becker, “Coherently combined power of 20 W at 2000 nm from a pair of thulium-doped fiber lasers,” Laser Phys. Lett. 10(9), 095104 (2013).
[Crossref]

P. F. Ma, P. Zhou, R. T. Su, Y. X. Ma, and Z. J. Liu, “Coherent polarization beam combining of eight fiber lasers using single-frequency dithering technique,” Laser Phys. Lett. 9(6), 456–458 (2012).
[Crossref]

Opt. Eng. (1)

G. D. Goodno, L. D. Book, J. E. Rothenberg, M. E. Weber, and S. B. Weiss, “Narrow linewidth power scaling and phase stabilization of 2-μm thulium fiber lasers,” Opt. Eng. 50(11), 111608 (2011).
[Crossref]

Opt. Express (2)

Opt. Lett. (2)

Proc. SPIE (2)

A. Hemming, N. Simakov, J. Haub, and A. Carter, “High power resonantly pumped holmium-doped fibre sources,” Proc. SPIE 8982, 898202 (2014).
[Crossref]

L. Liu and M. A. Vorontsov, “Phase-Locking of Tiled Fiber Array using SPGD Feedback Controller,” Proc. SPIE 5895, 58950P (2005).
[Crossref]

Other (3)

A. Brignon, Coherent laser beam combining (John Wiley & Sons, 2013).

S. McNaught, H. Komine, B. Weiss, R. Simpson, A. Johnson, J. Machan, C. Asman, M. Weber, G. Jones, M. Valley, A. Jankevics, D. Burchman, M. McClellan, J. Sollee, J. Marmo, and H. Injeyan, “100 kW Coherently Combined Slab MOPAs,” Proc. OSA/CLEO/IQEC (2009).
[Crossref]

B. Pulford, LOCSET phase locking: operation, disgnostics, and applications (The University of New Mexico, 2011).

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Figures (7)

Fig. 1
Fig. 1 (a) Coherent laser beam combination setup including filled aperture beam recombination and (b) a schematic of the thulium pumped holmium amplifiers.
Fig. 2
Fig. 2 Tiled aperture recombination setup.
Fig. 3
Fig. 3 Output characteristics for each of the amplifier channels as a function of pump power.
Fig. 4
Fig. 4 Output from the filled aperture recombination architecture (a) without and (b) with the detector output fed back into the SPGD algorithm.
Fig. 5
Fig. 5 (a) Near field profile of the tiled aperture beam combination. Output observed on the Pyrocam III (b) with no coherence between the four channels, (c) with a common frequency shift applied to each channel but with no phase control and (d) with the detector output fed back into the SPGD algorithm for phase control. The image width for (b), (c) and (d) was 12.5 mm.
Fig. 6
Fig. 6 (a) The number of iterations (blue) required to converge on a maximized output for a range of maximum phase dither amplitudes and the convergence times (red) calculated using the iteration time of 5.8µs. (b) An oscilloscope trace of the detector signal, when changing from minimizing to maximizing the SPGD algorithm is provided. It illustrates the rapid convergence (≈20 μs) observed when large phase dithers are permitted. The time taken for one SPGD iteration to occur is indicated in white and the intensity noise that occurs when applying large phase changes is indicated in red.
Fig. 7
Fig. 7 Temporal stability of the combined output following activation of the phase control for the (a) filled aperture and (b) tiled aperture combination.

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