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Proceedings Paper

Nonlinear absorption phenomena in optical materials for the UV-spectral range
Author(s): Eric Eva; Klaus R. Mann
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Paper 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.

Paper Details

Date Published: 20 November 1996
PDF: 7 pages
Proc. SPIE 2870, Third International Workshop on Laser Beam and Optics Characterization, (20 November 1996); doi: 10.1117/12.259933
Show Author Affiliations
Eric Eva, Laser-Lab. Goettingen eV (Germany)
Klaus R. Mann, Laser-Lab. Goettingen eV (Germany)

Published in SPIE Proceedings Vol. 2870:
Third International Workshop on Laser Beam and Optics Characterization
Michel Morin; Adolf Giesen, Editor(s)

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