Abstract

We report >50mJ Q-switched energy output from a 2.09µm Ho:YAG oscillator, resonantly pumped at 1.9µm by a diode-pumped Tm:YLF laser. We demonstrate a Q-switched-to-normal-mode extraction efficiency of 100% at an output energy of 30 mJ and over 64% at the 50-mJ output level. Operating at 50 mJ (60 Hz) of output, a pulse width of 14 ns is achieved from the holmium oscillator, which corresponds to 3.6 MW of peak power. At the 50-mJ output level, a beam-propagation factor M21.2 is achieved.

© 2003 Optical Society of America

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