Effects of nonlinear absorption in BK7 and color glasses at 355 nm

John J. Adams; Tom J. McCarville; Justin R. Bruere; James N. McElroy; John Peterson

doi:10.1117/12.523870

10 June 2004 Effects of nonlinear absorption in BK7 and color glasses at 355 nm

John J. Adams, Tom J. McCarville, Justin R. Bruere, James N. McElroy, John Peterson

Author Affiliations +

Proceedings Volume 5273, Laser-Induced Damage in Optical Materials: 2003; (2004) https://doi.org/10.1117/12.523870
Event: XXXV Annual Symposium on Optical Materials for High Power Lasers: Boulder Damage Symposium, 2003, Boulder, Colorado, United States

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.

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John J. Adams, Tom J. McCarville, Justin R. Bruere, James N. McElroy, and John Peterson "Effects of nonlinear absorption in BK7 and color glasses at 355 nm", Proc. SPIE 5273, Laser-Induced Damage in Optical Materials: 2003, (10 June 2004); https://doi.org/10.1117/12.523870

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