Pulse length dependence of laser conditioning and bulk damage in KD2PO4

John J. Adams; Timothy L. Weiland; Joel R. Stanley; Walter D. Sell; Ronald L. Luthi; James L. Vickers; Christopher Wren Carr; Michael D. Feit; Alexander M. Rubenchik; Mary L. Spaeth; Richard P. Hackel

doi:10.1117/12.585904

21 February 2005 Pulse length dependence of laser conditioning and bulk damage in KD₂PO₄

John J. Adams, Timothy L. Weiland, Joel R. Stanley, Walter D. Sell, Ronald L. Luthi, James L. Vickers, Christopher Wren Carr, Michael D. Feit, Alexander M. Rubenchik, Mary L. Spaeth, Richard P. Hackel

Author Affiliations +

Proceedings Volume 5647, Laser-Induced Damage in Optical Materials: 2004; (2005) https://doi.org/10.1117/12.585904
Event: Boulder Damage Symposium XXXVI, 2004, Boulder, Colorado, United States

Abstract

An experimental technique has been developed to measure the damage density ρ(Φ) variation with fluence from scatter maps of bulk damage sites in plates of KD₂PO₄ (DKDP) crystals combined with calibrated images of the damaging beam's spatial profile. Unconditioned bulk damage in tripler-cut DKDP crystals has been studied using 351 nm (3ω) light at pulse lengths of 0.055, 0.091, 0.30, 0.86, 2.6, and 10 ns. It is found that there is less scatter due to damage at fixed fluence for longer pulse lengths. The results also show that for all the pulse lengths the scatter due to damage is a strong function of the damaging fluence. It is determined that the pulse length scaling for bulk damage scatter in unconditioned DKDP material varies as τ^0.24±0.05 over two orders of magnitude of pulse lengths. The effectiveness of 3ω laser conditioning at pulse lengths of 0.055, 0.096, 0.30, 0.86, 3.5, and 23 ns is analyzed in term of damage density ρ(Φ) at 3ω, 2.6 ns. The 860 ps conditioning to a peak irradiance of 7 GW/cm² had the best performance under 3ω, 2.6 ns testing. It is shown that the optimal conditioning pulse length appears to lies in the range from 0.3 to 1 ns with a low sensitivity of 0.5 J/cm²/ns to the exact pulse length.

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John J. Adams, Timothy L. Weiland, Joel R. Stanley, Walter D. Sell, Ronald L. Luthi, James L. Vickers, Christopher Wren Carr, Michael D. Feit, Alexander M. Rubenchik, Mary L. Spaeth, and Richard P. Hackel "Pulse length dependence of laser conditioning and bulk damage in KD₂PO₄", Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005); https://doi.org/10.1117/12.585904

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