Progress in research on laser damage mechanisms and contamination problem

T. Jitsuno; H. Murakami; K. Kato; E. Sato; K. Mikami; S. Motokoshi; N. Miyanaga; H. Azechi

doi:10.1117/12.2073663

22 September 2014 Progress in research on laser damage mechanisms and contamination problem

T. Jitsuno, H. Murakami, K. Kato, E. Sato, K. Mikami, S. Motokoshi, N. Miyanaga, H. Azechi

Proceedings Volume 9238, Pacific Rim Laser Damage 2014: Optical Materials for High-Power Lasers; 923802 (2014) https://doi.org/10.1117/12.2073663
Event: Pacific-rim Laser Damage, 2014, Yokohama, Japan

Abstract

In high power laser systems, the laser-induced damage threshold (LIDT) in optical coating is very important parameters for obtaining high performances. Recently, LIDT was found to have strong temperature dependences in the bulk, surface of substrates, and in coatings. These temperature dependences of LIDT were carefully measured, and the damage formation model was constructed regarding to this temperature dependence. To explain this temperature dependence of LIDT, the temperature dependences of the initial electron generation and electron multiplication in the avalanche process were taken into account. On the other hand, LIDT in optical coating is very sensitive to organic contaminations accumulated in coating layers during storage and using condition. This paper also introduces the oil-contamination problem in LFEX laser system for First Ignition scheme in the laser fusion. We have analyzed contaminants and evaluated the effects of the contamination. We also developed new cleaning methods to remove contamination from the coating, and we have succeeded to prevent the degradation in LIDT for the duration of evacuation with Silica-gel in the chamber. The quantitative analysis of contamination on LIDT was made. We have investigated the characteristics of LIDT in dielectric coatings under the controlled contamination with several materials.

Citation Download Citation

T. Jitsuno, H. Murakami, K. Kato, E. Sato, K. Mikami, S. Motokoshi, N. Miyanaga, and H. Azechi "Progress in research on laser damage mechanisms and contamination problem", Proc. SPIE 9238, Pacific Rim Laser Damage 2014: Optical Materials for High-Power Lasers, 923802 (22 September 2014); https://doi.org/10.1117/12.2073663

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KEYWORDS

Contamination

Optical coatings

Laser induced damage

Laser systems engineering

Dielectrics

Nitrogen

Pulsed laser operation

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