Absorptance measurements of transmissive optical components by the surface thermal lensing technique

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The surface thermal lensing technique (STL) successfully resolved and measured the absorptance of transmissive optical components: near- normal angle-of-incidence anti-reflectors and beam splatters. The STL system uses an Ar ion laser to pump the components at 514.5 mn. The absorptance-induced surface deformation diffracts the HeNe probe beam into a photo-detector. The signal intensity was calibrated with a sample of known absorptance. The optical components were designed to function in a copper vapor laser (CVL) transport system, and were previously tested for absorptance with a high power CVL system at 511 rtm. To assure proper absorptance data from the STL system, ... continued below

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12 p.; Other: FDE: PDF; PL:

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Chow, R.; Taylor, J.R.; Wu, Z.L.; Han, Y. & Tian, L.Y. September 24, 1997.

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The surface thermal lensing technique (STL) successfully resolved and measured the absorptance of transmissive optical components: near- normal angle-of-incidence anti-reflectors and beam splatters. The STL system uses an Ar ion laser to pump the components at 514.5 mn. The absorptance-induced surface deformation diffracts the HeNe probe beam into a photo-detector. The signal intensity was calibrated with a sample of known absorptance. The optical components were designed to function in a copper vapor laser (CVL) transport system, and were previously tested for absorptance with a high power CVL system at 511 rtm. To assure proper absorptance data from the STL system, the pump laser power densities were set at the operational level of the coatings, absorptance time trends were monitored, and absorptance area scans were made. Both types of transmissive optics are more stable than the CVL high reflectors that were measured in another study. Parameter studies based on Fresnel diffraction theory were also performed to optimize experimental condition. The STL system was assessed to have 10 ppb sensitivity for absorption measurement given 2 W of pump power.

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12 p.; Other: FDE: PDF; PL:

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OSTI as DE98051545

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  • 29. annual Boulder damage symposium on optical materials for high power lasers, Boulder, CO (United States), 6-8 Oct 1997

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  • Other: DE98051545
  • Report No.: UCRL-JC--128008
  • Report No.: CONF-9710116--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 641340
  • Archival Resource Key: ark:/67531/metadc692438

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 24, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 16, 2016, 1:34 p.m.

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Chow, R.; Taylor, J.R.; Wu, Z.L.; Han, Y. & Tian, L.Y. Absorptance measurements of transmissive optical components by the surface thermal lensing technique, article, September 24, 1997; California. (digital.library.unt.edu/ark:/67531/metadc692438/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.