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  • Vol. 36, Iss. 6 — Mar. 15, 2011
  • pp: 999–1001

Active coherent beam combining of diode lasers

Shawn M. Redmond, Kevin J. Creedon, Jan E. Kansky, Steven J. Augst, Leo J. Missaggia, Michael K. Connors, Robin K. Huang, Bien Chann, Tso Yee Fan, George W. Turner, and Antonio Sanchez-Rubio  »View Author Affiliations


Optics Letters, Vol. 36, Issue 6, pp. 999-1001 (2011)
http://dx.doi.org/10.1364/OL.36.000999


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Abstract

We have demonstrated active coherent beam combination (CBC) of up to 218 semiconductor amplifiers with 38.5 W cw output using up to eleven one-dimensional 21-element individually addressable diode amplifier arrays operating at 960 nm . The amplifier array elements are slab-coupled-optical-waveguide semiconductor amplifiers (SCOWAs) set up in a master-oscillator–power-amplifier configuration. Diffractive optical elements divide the master-oscillator beam to seed multiple arrays of SCOWAs. A SCOWA was phase actuated by adjusting the drive current to each element and controlled using a stochastic-parallel-gradient-descent (SPGD) algorithm for the active CBC. The SPGD is a hill-climbing algorithm that maximizes on-axis intensity in the far field, providing phase locking without needing a reference beam.

© 2011 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(140.2010) Lasers and laser optics : Diode laser arrays
(250.5980) Optoelectronics : Semiconductor optical amplifiers
(140.3298) Lasers and laser optics : Laser beam combining
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: December 22, 2010
Revised Manuscript: February 15, 2011
Manuscript Accepted: February 15, 2011
Published: March 15, 2011

Citation
Shawn M. Redmond, Kevin J. Creedon, Jan E. Kansky, Steven J. Augst, Leo J. Missaggia, Michael K. Connors, Robin K. Huang, Bien Chann, Tso Yee Fan, George W. Turner, and Antonio Sanchez-Rubio, "Active coherent beam combining of diode lasers," Opt. Lett. 36, 999-1001 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-6-999


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