Effects of laser-induced damage on optical windows in the presence of adhesives under simulated thermal-vacuum conditions

Chad Y. Sheng

doi:10.1117/12.695857

15 January 2007 Effects of laser-induced damage on optical windows in the presence of adhesives under simulated thermal-vacuum conditions

Chad Y. Sheng

Author Affiliations +

Proceedings Volume 6403, Laser-Induced Damage in Optical Materials: 2006; 64030H (2007) https://doi.org/10.1117/12.695857
Event: Boulder Damage Symposium XXXVIII: Annual Symposium on Optical Materials for High Power Lasers, 2006, Boulder, Colorado, United States

Abstract

The current research focused upon ascertaining the extent of induced laser damage that occurs due to the outgassing species from adhesives that will contaminate the optics. The adhesives that are being studied are actual flight materials that are being used in mounting optics in existing 1064nm LIDAR laser systems. Three different adhesives were tested in our vacuum system. Each sample was loaded onto an effusive source and a PID controller controls the set point temperature of the adhesive. The optics that were tested were anti-reflective coated BK7 windows. An oil free vacuum pump system was used to pump the system down to approximately 10^-5 Torr. The vacuum pressure of the system was measured by use of a thermocouple gauge and a Bayard Alpert ion gauge. The test windows were irradiated with a 20 Hz Nd:YAG laser at 1064 nm with a nominal fluence of 1 J-cm^-2 for at least 1 million shots. All sample windows are analyzed by use of bright field and dark field light microscope. Under the test conditions that were performed, varying extent of damage with different morphologies were observed; making it difficult to specify a single damage mechanism that would adequately explain the vast differences observed.

Citation Download Citation

Chad Y. Sheng "Effects of laser-induced damage on optical windows in the presence of adhesives under simulated thermal-vacuum conditions", Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 64030H (15 January 2007); https://doi.org/10.1117/12.695857

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