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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 30 — Oct. 20, 2013
  • pp: 7233–7242

Ultimate efficiency of spectral beam combining by volume Bragg gratings

Derrek R. Drachenberg, Oleksiy Andrusyak, George Venus, Vadim Smirnov, Julien Lumeau, and Leonid B. Glebov  »View Author Affiliations


Applied Optics, Vol. 52, Issue 30, pp. 7233-7242 (2013)
http://dx.doi.org/10.1364/AO.52.007233


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Abstract

Spectral beam combining (SBC) by volume Bragg gratings (VBGs) recorded in photo-thermo-refractive (PTR) glass is a powerful tool for laser applications that require higher radiance than a single laser unit can achieve. The beam-combining factor (BCF) is introduced as a tool to compare various beam-combining methods and experiments. It describes the change of radiance provided by a beam-combining system but is not affected by the initial beam quality of the combined lasers. A method of optimization of VBGs providing the maximum efficiency of SBC has been described for an arbitrary number of beams. An experiment confirming the proposed modeling for a two-beam SBC system by a single VBG has demonstrated a total combined power of 301 W with a channel separation of 0.25 nm, combining efficiency of 97%, close to diffraction limited divergence with M2=1.18, BCF of 0.77, and spectral radiance of 770TW/(sr·m2·nm), the highest to date for SBC.

© 2013 Optical Society of America

OCIS Codes
(090.2890) Holography : Holographic optical elements
(140.3510) Lasers and laser optics : Lasers, fiber
(160.2750) Materials : Glass and other amorphous materials
(230.1480) Optical devices : Bragg reflectors
(140.3298) Lasers and laser optics : Laser beam combining

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: July 16, 2013
Revised Manuscript: September 11, 2013
Manuscript Accepted: September 14, 2013
Published: October 14, 2013

Citation
Derrek R. Drachenberg, Oleksiy Andrusyak, George Venus, Vadim Smirnov, Julien Lumeau, and Leonid B. Glebov, "Ultimate efficiency of spectral beam combining by volume Bragg gratings," Appl. Opt. 52, 7233-7242 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-30-7233


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