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Applied Optics

Applied Optics


  • Vol. 51, Iss. 11 — Apr. 10, 2012
  • pp: 1724–1728

External cavity beam combining of 21 semiconductor lasers using SPGD

Juan Montoya, Steven J. Augst, Kevin Creedon, Jan Kansky, Tso Yee Fan, and Antonio Sanchez-Rubio  »View Author Affiliations

Applied Optics, Vol. 51, Issue 11, pp. 1724-1728 (2012)

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Active coherent beam combining of laser oscillators is an attractive way to achieve high output power in a diffraction limited beam. Here we describe an active beam combining system used to coherently combine 21 semiconductor laser elements with an 81% beam combining efficiency in an external cavity configuration compared with an upper limit of 90% efficiency in the particular configuration of the experiment. Our beam combining system utilizes a stochastic parallel gradient descent (SPGD) algorithm for active phase control. This work demonstrates that active beam combining is not subject to the scaling limits imposed on passive-phasing systems.

© 2012 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(140.2010) Lasers and laser optics : Diode laser arrays
(140.3290) Lasers and laser optics : Laser arrays
(140.3298) Lasers and laser optics : Laser beam combining
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Diffraction and Gratings

Original Manuscript: November 18, 2011
Manuscript Accepted: February 2, 2012
Published: April 5, 2012

Virtual Issues
April 30, 2012 Spotlight on Optics

Juan Montoya, Steven J. Augst, Kevin Creedon, Jan Kansky, Tso Yee Fan, and Antonio Sanchez-Rubio, "External cavity beam combining of 21 semiconductor lasers using SPGD," Appl. Opt. 51, 1724-1728 (2012)

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