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Proceedings Paper

Effects of nonlinear absorption in BK7 and color glasses at 355 nm
Author(s): John J. Adams; Tom J. McCarville; Justin R. Bruere; James N. McElroy; John Peterson
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Paper Abstract

We have demonstrated a simple experimental technique that can be used to measure the nonlinear absorption coefficients in glasses. We determine BK7, UG1, and UG11 glasses to have linear absorption coefficients of 0.0217 ± 10% cm-1, 1.7 ± 10% cm-1, and 0.82 ± 10% cm-1, respectively, two-photon absorption cross-sections of 0.025 ± 20% cm/GW, 0.035 ± 20% cm/GW, and 0.047 ± 20% cm/GW, respectively, excited-state absorption cross-sections of 8.0 x 10-18 ± 20% cm2, 2.8 x 10-16 ± 20% cm2, and 5 x 10-17 ± 20% cm2, respectively, and solarization coefficients of 8.5 x 10-20 ± 20% cm2, 2.5 x 10-18 ± 20% cm2, and 1.3 x 10-19 ± 20% cm2, respectively. For our application, nonlinear effects in 10-cm of BK7 are small (≤ 2%) for 355-nm fluences < 0.2 J/cm2 for flat-top pulses. However, nonlinear effects are noticeable for 355-nm fluences at 0.8 J/cm2. In particular, we determine a 20% increase in the instantaneous absorption from linear, a solarization rate of 4% per 100 shots, and a 10% temporal droop introduced in the pulse, for 355-nm flat-top pulses at a fluence of 0.8 J/cm2. For 0.5-cm of UG1 absorbing glass the non-linear absorption has a similar effect as that from 10-cm of BK7 on the pulse shape; however, the effects in UG11 are much smaller.

Paper Details

Date Published: 10 June 2004
PDF: 15 pages
Proc. SPIE 5273, Laser-Induced Damage in Optical Materials: 2003, (10 June 2004); doi: 10.1117/12.523870
Show Author Affiliations
John J. Adams, Lawrence Livermore National Lab. (United States)
Tom J. McCarville, Lawrence Livermore National Lab. (United States)
Justin R. Bruere, Lawrence Livermore National Lab. (United States)
James N. McElroy, Lawrence Livermore National Lab. (United States)
John Peterson, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 5273:
Laser-Induced Damage in Optical Materials: 2003
Gregory J. Exarhos; Arthur H. Guenther; Norbert Kaiser; Keith L. Lewis; M. J. Soileau; Christopher J. Stolz, Editor(s)

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