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High-temperature performance of alexandrite lasers

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Abstract

The performance of a fiashlamp pumped alexandrite laser was evaluated at temperatures from approximately room temperature ambient to levels substantially in excess of those commonly en- countered in operation of solid-state lasers, e.g., from 34 to 310°C. To permit high-temperature operation, a close-coupled laser pump cavity was constructed using a 2.3-mm diam, 40-mm long cylindrical laser rod doped with 0.4 at. % chromium and incorporating single-layer magnesium fluoride anti reflection coatings. A 3-mm i.d., 5- mm o.d., 37.5-mm arc length fiashlamp pressurized with 400-Torr xenon provided optical excitation. A polished aluminum reflector surrounded the pump cavity to enhance efficiency. Temperature control was effected using a simple overt with an opening in each end for beam passage. The 30-cm long laser resonator consisted of flat mirrors external to the oven. The mirrors were coated for high reflectivity and 17% transmission, respectively, in the 720-790-nm spectral range, A 30-μF, 40-μH pulse forming network using a SCR switch was operated in the 450-1000-V range to provide fiashlamp drive.

© 1983 Optical Society of America

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