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Title: A Summary of Recent Damage-Initiation Experiments on KDP Crystals

Abstract

We summarize recent investigations of the density and morphology of bulk damage in KDP crystals as a function of pulse duration, temporal profile, wavelength, and energy fluence. As previously reported by Runkel et al., we also find that the size of bulk damage sites varies roughly linearly with pulse duration for pulses between 1 ns and 9 ns. However this trend no longer applies at pulse durations below 1 ns. Experiments measuring the damage density and size distribution as a function of wavelength confirm many previous works which indicated a strong dependence of damage density with wavelength. However, we also find that the size of damage sites is relatively insensitive to wavelength. Further we see damage due to Flat-In-Time (FIT) pulses has different pulse length and fluence dependence than Gaussian pulses. We demonstrate that a simple thermal diffusion model can account for observed differences in damage densities due to square and Gaussian temporally shaped pulses of equal fluence. Moreover, we show that the key laser parameter governing size of the bulk damage sites is the length of time the pulse remains above a specific intensity. The different dependences of damage density and damage site size on laser parameters suggest differentmore » absorption mechanisms early and late in the damaging pulse.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
887280
Report Number(s):
UCRL-PROC-216929
Journal ID: ISSN 0277-786X; TRN: US200618%%44
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 5991; Conference: Presented at: Boulder Damage Symposium XXXVII, Boulder, CO, United States, Sep 19 - Sep 22, 2005
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ABSORPTION; DISTRIBUTION; LASERS; MORPHOLOGY; THERMAL DIFFUSION; WAVELENGTHS

Citation Formats

Carr, C W, Feit, M D, Rubenchik, A M, Trenholme, J B, and Spaeth, M L. A Summary of Recent Damage-Initiation Experiments on KDP Crystals. United States: N. p., 2005. Web. doi:10.1117/12.638829.
Carr, C W, Feit, M D, Rubenchik, A M, Trenholme, J B, & Spaeth, M L. A Summary of Recent Damage-Initiation Experiments on KDP Crystals. United States. doi:10.1117/12.638829.
Carr, C W, Feit, M D, Rubenchik, A M, Trenholme, J B, and Spaeth, M L. Mon . "A Summary of Recent Damage-Initiation Experiments on KDP Crystals". United States. doi:10.1117/12.638829. https://www.osti.gov/servlets/purl/887280.
@article{osti_887280,
title = {A Summary of Recent Damage-Initiation Experiments on KDP Crystals},
author = {Carr, C W and Feit, M D and Rubenchik, A M and Trenholme, J B and Spaeth, M L},
abstractNote = {We summarize recent investigations of the density and morphology of bulk damage in KDP crystals as a function of pulse duration, temporal profile, wavelength, and energy fluence. As previously reported by Runkel et al., we also find that the size of bulk damage sites varies roughly linearly with pulse duration for pulses between 1 ns and 9 ns. However this trend no longer applies at pulse durations below 1 ns. Experiments measuring the damage density and size distribution as a function of wavelength confirm many previous works which indicated a strong dependence of damage density with wavelength. However, we also find that the size of damage sites is relatively insensitive to wavelength. Further we see damage due to Flat-In-Time (FIT) pulses has different pulse length and fluence dependence than Gaussian pulses. We demonstrate that a simple thermal diffusion model can account for observed differences in damage densities due to square and Gaussian temporally shaped pulses of equal fluence. Moreover, we show that the key laser parameter governing size of the bulk damage sites is the length of time the pulse remains above a specific intensity. The different dependences of damage density and damage site size on laser parameters suggest different absorption mechanisms early and late in the damaging pulse.},
doi = {10.1117/12.638829},
journal = {},
number = ,
volume = 5991,
place = {United States},
year = {Mon Nov 07 00:00:00 EST 2005},
month = {Mon Nov 07 00:00:00 EST 2005}
}

Conference:
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