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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 30 — Oct. 20, 2011
  • pp: 5905–5911

Near-IR absorption in high-purity photothermorefractive glass and holographic optical elements: measurement and application for high-energy lasers

Julien Lumeau, Larissa Glebova, and Leonid B. Glebov  »View Author Affiliations


Applied Optics, Vol. 50, Issue 30, pp. 5905-5911 (2011)
http://dx.doi.org/10.1364/AO.50.005905


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Abstract

Volume Bragg gratings (VBGs) in photothermorefractive (PTR) glass are widely used for laser beam control including high-power laser systems. Among them, spectral beam combining based on VBGs is one of the most promising. Achieving 100 + kW of combined laser beams requires the development of PTR glass and VBGs with an extremely low absorption coefficient and therefore methods of its measurement. This paper describes the calorimetric method that was developed for measuring a low absorption coefficient in PTR glass and VBGs. It is based on transmission monitoring of the intrinsic Fabry–Perot interferometer produced by the plane-parallel surfaces of the measured optical elements when heated by high-power laser radiation. An absorption coefficient at 1085 nm as low as 5 × 10 5 cm 1 is demonstrated in pristine PTR glass while an absorption coefficient as low as 1 × 10 4 cm 1 is measured in high-efficiency reflecting Bragg gratings with highest purity. The actual level of absorption in PTR glass allows laser beam control at the 10 kW level, while the 100 kW level would require active cooling and/or decreasing the absorption in PTR Bragg gratings to a value similar to that in virgin PTR glass.

© 2011 Optical Society of America

OCIS Codes
(050.7330) Diffraction and gratings : Volume gratings
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3940) Instrumentation, measurement, and metrology : Metrology
(140.3460) Lasers and laser optics : Lasers
(160.2900) Materials : Optical storage materials
(300.1030) Spectroscopy : Absorption

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 5, 2011
Revised Manuscript: September 13, 2011
Manuscript Accepted: September 13, 2011
Published: October 18, 2011

Citation
Julien Lumeau, Larissa Glebova, and Leonid B. Glebov, "Near-IR absorption in high-purity photothermorefractive glass and holographic optical elements: measurement and application for high-energy lasers," Appl. Opt. 50, 5905-5911 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-30-5905

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