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520 mJ langasite electro-optically Q-switched Cr, Tm, Ho:YAG laser

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Abstract

A flash lamp pumped 2.09 μm Cr, Tm, Ho:YAG laser utilizing a self-grown La3Ga5SiO14 crystal as the electro-optic Q-switch generator is proposed and demonstrated for the first time. Operating at 3 Hz repetition rate, 520 mJ pulse energy with 35 ns pulse width is achieved by optimizing the Q-switch delay time and compensating for the thermal depolarization with a quarter-wave plate. The corresponding peak power is 14.86 MW, and the Q-switched-to-normal-mode energy extraction efficiency is 66.3%. To our knowledge, this Q-switched giant pulse is the best result reported to date in 2.09 μm laser resonator.

©2012 Optical Society of America

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