High reflector absorptance measurements by the surface thermal lensing technique

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Surface thermal lensing is an alternate configuration of a photothermal deflection system that was used to measure low levels of optical absorption. The thermal lensing configuration facilitated the alignment of the pump and probe laser beams by using a larger diameter probe beam. This technique was applied to high performance optical coatings, specifically high reflectors at 511 nm, zero degrees angle of incidence. The absorptance of these coatings was previously measured using a high power copper vapor laser system. A high power copper laser beam is focused onto a -2 mm diameter spot. A thermal camera senses the temperature rise ... continued below

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10 p.

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Chow, R.; Taylor, J.R.; Wu, Z.L.; Krupka, R. & Yang, T. November 1, 1996.

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Surface thermal lensing is an alternate configuration of a photothermal deflection system that was used to measure low levels of optical absorption. The thermal lensing configuration facilitated the alignment of the pump and probe laser beams by using a larger diameter probe beam. This technique was applied to high performance optical coatings, specifically high reflectors at 511 nm, zero degrees angle of incidence. The absorptance of these coatings was previously measured using a high power copper vapor laser system. A high power copper laser beam is focused onto a -2 mm diameter spot. A thermal camera senses the temperature rise with respect to the rest of the coating. The temperature change, power density and beam diameter were used with an empirical formula that yields optical absorption. The surface thermal lensing technique was able to resolve absorption levels lower than that achieved with the copper laser method.

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10 p.

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OSTI as DE97051383

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  • 28. annual symposium on optical materials for high power lasers - Boulder damage symposium, Boulder, CO (United States), 7-9 Oct 1996

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  • Other: DE97051383
  • Report No.: UCRL-JC--125736
  • Report No.: CONF-961070--5
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 461394
  • Archival Resource Key: ark:/67531/metadc687686

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  • November 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Feb. 16, 2016, 7:35 p.m.

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Chow, R.; Taylor, J.R.; Wu, Z.L.; Krupka, R. & Yang, T. High reflector absorptance measurements by the surface thermal lensing technique, article, November 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc687686/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.