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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 6 — Feb. 20, 2014
  • pp: 1242–1246

Thermal tuning of volume Bragg gratings for spectral beam combining of high-power fiber lasers

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


Applied Optics, Vol. 53, Issue 6, pp. 1242-1246 (2014)
http://dx.doi.org/10.1364/AO.53.001242


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Abstract

High-radiance lasers are desired for many applications in defense and manufacturing. Spectral beam combining (SBC) by volume Bragg gratings (VBGs) is a very promising method for high-radiance lasers that need to achieve 100 kW level power. Laser-induced heating of VBGs under high-power radiation presents a challenge for maintaining Bragg resonance at various power levels without mechanical realignment. A novel thermal tuning technique and apparatus is presented that enables maintaining peak efficiency operation of the SBC system at various power levels without any mechanical adjustment. The method is demonstrated by combining two high-power ytterbium fiber lasers with high efficiency from low power to full combined power of 300 W (1.5 kW effective power), while maintaining peak combining efficiency within 0.5%.

© 2014 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:
Diffraction and Gratings

History
Original Manuscript: November 29, 2013
Revised Manuscript: January 12, 2014
Manuscript Accepted: January 13, 2014
Published: February 20, 2014

Citation
Derrek R. Drachenberg, Oleksiy Andrusyak, George Venus, Vadim Smirnov, and Leonid B. Glebov, "Thermal tuning of volume Bragg gratings for spectral beam combining of high-power fiber lasers," Appl. Opt. 53, 1242-1246 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-6-1242


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