Abstract
We report on a radially polarized and passively Q-switched Nd:YAG/Cr4+:YAG
laser. The bulk Nd:YAG crystal is bonded with two undoped YAG crystal end caps to
weaken the thermal lens e?ect and thus, enhance the extraction of stored energy in
the bulk gain material. In the absence of active water cooling, the average laser
power reaches 383 mW with 33% slope e±ciency, and the laser pulse achieves 1.457-W
peak power, 18.9-ns duration, and 13.9-kHz repetition rate with 97.6% polarization
purity.
© 2011 Chinese Optics Letters
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