Measurements of UV induced absorption in dielectric coatings

M. H. Bakshi

doi:10.1117/12.2294461

1 November 1990 Measurements of UV induced absorption in dielectric coatings

M. H. Bakshi

Proceedings Volume 1438, Laser-Induced Damage in Optical Materials 1989; 14381G (1990) https://doi.org/10.1117/12.2294461
Event: Laser-Induced Damage in Optical Materials 1989, 1989, Boulder, CO, United States

Abstract

We discuss the first results obtained from a new testing fa- cility for measuring the induced absorption in multilayer dielec- tric coatings exposed to intense UV radiation. The absorption loss is measured in-situ during exposure, as a function of time for var- ious UV photon energies, intensities, and sample materials. The sample is irradiated by the direct beam from the TOK undulator at NSLS and measured in-vacuo. The undulator is typically run at K = 1 (so that the harmonic emission is low) to simplify the data anal- ysis. The test chamber is separated from the undulator beamline by a differentially pumped line which permits the introduction of car- bonaceous gases into the chamber at pressures up to 10-5 Torr. By varying the current and energy of the stored electrons, one can ad- just the intensity and photon energy of the undulator first harmonic in the range up to 1.2 w/cm2, and between about 5 eV and 35 eV.

Citation Download Citation

M. H. Bakshi "Measurements of UV induced absorption in dielectric coatings", Proc. SPIE 1438, Laser-Induced Damage in Optical Materials 1989, 14381G (1 November 1990); https://doi.org/10.1117/12.2294461

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