Variations with Laser Pulse Duration of the Thresholds at 350-NM and 1064-NM for Bulk Damage in Crystals of KDP (Potassium Dihydrogen Phosphate).

摘要

Five separate laser facilities were used to measure 350-nm and 1064-nm thresholds for bulk damage in crystals of potassium dihydrogen phosphate (KDP). At 1064 nm, tests were made with single laser pulses having durations from 1 to 20 ns and with 9-ns incident at 10 Hz. At 350 nm tests were made with single pulses having durations of 0.6, 5 and 25 ns and with 25-ns pulses incident at rates up to 50 Hz. Over the range from 0.6 to 25 ns, 350-nm thresholds increased by factors of approximately 2 to 3, and 350-nm thresholds were almost independent of laser repetition rate. The 1064-nm thresholds increased by a factor of 2 as pulse duration increased from 1 to 20 ns. Laser hardening of thresholds at 1064-nm was observed after hardening at both 350 nm and 1064 nm. (ERA citation 14:001097)