20 April 1998 Investigation of optical calorimetric absorptance of Suprasil and CaF2 substrates in the UV range
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Calorimetric absorption measurements are a valuable supplement for investigation of laser damage processes at substrate materials in the UV region. Our investigations for the influence of the measurement arrangement and irradiation parameters on the absorption and its wavelength dependence were carried out in the frame of standardization project CHOCLAB. The measurement set-up was presented at the Boulder Damage Symposium last year. To investigate the influence of the spectral dependence of absorptance in the UV range comparison measurements at different excimer laser wavelengths 193 nm, 248 nm and 351 nm were carried out. Suprasil and CaF2 were investigated at different sample thicknesses under variation of irradiation parameters. The measured absorptance of Suprasil at 248 nm and 193 nm increases at growing repetition rates and equal energy density. At a fixed rap rate absorptance is proportional to energy density. Absorptance of CaF2 under irradiation with 193 nm depends on energy density. For both materials the described effects are enhancing with increasing sample thickness.
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Ute Pfeifer, Ute Pfeifer, Bernhard Steiger, Bernhard Steiger, } "Investigation of optical calorimetric absorptance of Suprasil and CaF2 substrates in the UV range", Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); doi: 10.1117/12.307012; https://doi.org/10.1117/12.307012


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