The nature of emission from optical breakdown induced by pulses of fs and ns duration

Christopher Wren Carr; Michael D. Feit; Alexander M. Rubenchik; Paul P. DeMange; Sergei O. Kucheyev; Michael D. Shirk; Harry B. Radousky; Stavros G. Demos

doi:10.1117/12.585925

21 February 2005 The nature of emission from optical breakdown induced by pulses of fs and ns duration

Christopher Wren Carr, Michael D. Feit, Alexander M. Rubenchik, Paul P. DeMange, Sergei O. Kucheyev, Michael D. Shirk, Harry B. Radousky, Stavros G. Demos

Author Affiliations +

Proceedings Volume 5647, Laser-Induced Damage in Optical Materials: 2004; (2005) https://doi.org/10.1117/12.585925
Event: Boulder Damage Symposium XXXVI, 2004, Boulder, Colorado, United States

Abstract

Spectral emission from optical breakdown in the bulk of a transparent dielectric contains information about the nature of the breakdown medium. We have made time resolved measurements of the breakdown induced emission caused by nanosecond and femtosecond infrared laser pulses. We previously demonstrated that the emission due to ns pulses is blackbody in nature allowing determination of the fireball temperature and pressure during and after the damage event. The emission due to femtosecond pulse breakdown is not blackbody in nature; two different spectral distributions being noted. In one case, the peak spectral distribution occurs at the second harmonic of the incident radiation, in the other the distribution is broader and flatter and presumably due to continuum generation. The differences between ns and fs breakdown emission can be explained by the differing breakdown region geometries for the two pulse durations. The possibility to use spectral emission as a diagnostic of the emission region morphology will be discussed.

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Christopher Wren Carr, Michael D. Feit, Alexander M. Rubenchik, Paul P. DeMange, Sergei O. Kucheyev, Michael D. Shirk, Harry B. Radousky, and Stavros G. Demos "The nature of emission from optical breakdown induced by pulses of fs and ns duration", Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005); https://doi.org/10.1117/12.585925

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