Laser damage of dichroic coatings in a high average power laser vacuum resonator

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In our application, dichroics in a high average power, near-infrared, laser system have short operating lifetimes. These dichroics were used as the resonator fold mirrors and permitted the transmission of the pumping argon (Ar) ion laser light. Representative samples of two different dichroic optics were taken off-line and the transmission performance monitored in various scenarios. Irradiating these optics under resonator vacuum conditions, ({le}1 mT, 11.7 kW/cm{sup 2}, Ar laser running all wavelengths) resulted in a degradation of transmission with time. Irradiating these optics in a rarefied oxygen atmosphere (1 to 10 T of oxygen, 11.7 kW/cm{sup 2}, Ar laser running ... continued below

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895 Kilobytes pages

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Arnold, P A; Berzins, L V; Chow, R & Erbert, G V July 28, 1999.

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In our application, dichroics in a high average power, near-infrared, laser system have short operating lifetimes. These dichroics were used as the resonator fold mirrors and permitted the transmission of the pumping argon (Ar) ion laser light. Representative samples of two different dichroic optics were taken off-line and the transmission performance monitored in various scenarios. Irradiating these optics under resonator vacuum conditions, ({le}1 mT, 11.7 kW/cm{sup 2}, Ar laser running all wavelengths) resulted in a degradation of transmission with time. Irradiating these optics in a rarefied oxygen atmosphere (1 to 10 T of oxygen, 11.7 kW/cm{sup 2}, Ar laser running all wavelengths) the transmission remained steady over a period of days. The transmission loss observed in the optic tested in vacuum was somewhat reversible if the optic was subsequently irradiated in a rarefied oxygen atmosphere. This reversibility was only possible if the transmission degradation was not too severe. Further tests demonstrated that an atmosphere of 10 T of air also prevented the transmission degradation. In addition, tests were performed to demonstrate that the optic damage was not caused by the ultra-violet component in the Ar ion laser. Mechanisms that may account for this behavior are proposed.

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895 Kilobytes pages

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  • 31st Annual Boulder Damage Symposium: Annual Symposium on Optical Materials for High Power Lasers, Boulder, CO (US), 10/04/1999--10/07/1999

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  • Report No.: UCRL-JC-135699
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 14688
  • Archival Resource Key: ark:/67531/metadc618931

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Office of Scientific & Technical Information Technical Reports

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

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  • July 28, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 2:40 p.m.

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Arnold, P A; Berzins, L V; Chow, R & Erbert, G V. Laser damage of dichroic coatings in a high average power laser vacuum resonator, article, July 28, 1999; California. (digital.library.unt.edu/ark:/67531/metadc618931/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.