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Proceedings Article

Thermal lensing compensation optics for high power lasers

[+] Author Affiliations
Michael Scaggs

Neoteric Concepts, LLC (USA)

Gil Haas

Haas Laser Technologies, Inc. (USA)

Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 79130C (February 18, 2011); doi:10.1117/12.871370
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From Conference Volume 7913

  • Laser Resonators and Beam Control XIII
  • Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko
  • San Francisco, California, USA | January 22, 2011

abstract

Athermalization of focusing objectives is a common technique for optimizing imaging systems in the infrared where thermal effects are a major concern. The athermalization is generally done within the spectrum of interest and not generally applied to a single wavelength. The predominate glass used with high power infrared lasers in the near infrared of one micron, such as Nd:YAG and fiber lasers, is fused silica which has excellent thermal properties. All glasses, however, have a temperature coefficient of index of refraction (dn/dT ) where as the glass heats up its index of refraction changes. Most glasses, fused silica included, have a positive dn/dT . A positive dn/dT will cause the focal length of the lens to decrease with a temperature rise. Many of the fluoride glasses, like CaF2, BaF2, LiF2, etc. have a negative dn/dT. By applying athermalization techniques of glass selection and optical design, the thermal lensing in a laser objective of a high power laser system can be substantially mitigated. We describe a passive method for minimizing thermal lensing of high power laser optics.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Michael Scaggs and Gil Haas
"Thermal lensing compensation optics for high power lasers", Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 79130C (February 18, 2011); doi:10.1117/12.871370; http://dx.doi.org/10.1117/12.871370


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