Nonlinear absorption phenomena in optical materials for the UV-spectral range

Eric Eva; Klaus R. Mann

doi:10.1117/12.259933

20 November 1996 Nonlinear absorption phenomena in optical materials for the UV-spectral range

Eric Eva, Klaus R. Mann

Proceedings Volume 2870, Third International Workshop on Laser Beam and Optics Characterization; (1996) https://doi.org/10.1117/12.259933
Event: Third International Workshop on Laser Beam and Optics Characterization, 1996, Quebec City, Canada

Abstract

A laser calorimetric technique is employed to measure absorptance and laser-induced changes therein on optical components at 248 nm. In BaF₂ a linear increase of absorptance with intensity is observed, but a pure two- photon absorption mechanism can be ruled out because the slope lessens towards shorter pulse lengths. Fused silica, at moderate energy densities, exhibits a reversible, linear absorption increase with energy density; an AR-coated sample mirrors the behavior of the uncoated substrate but discloses an added offset due to coating imperfections. In a series of measurements at constant irradiation parameters, uncoated substrates of Suprasil and CaF₂ reveal a slight exponential decrease in absorptance which might be attributed to surface cleaning or conditioning effects, and absolute absorptance is virtually independent of the sample thickness.

Citation Download Citation

Eric Eva and Klaus R. Mann "Nonlinear absorption phenomena in optical materials for the UV-spectral range", Proc. SPIE 2870, Third International Workshop on Laser Beam and Optics Characterization, (20 November 1996); https://doi.org/10.1117/12.259933

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