Abstract

Stable passive Q-switching of a Tm:LiYF4 laser is obtained using polycrystalline Cr2+:ZnS as a saturable absorber. The achieved maximum pulse energy of 0.9 mJ and peak power of 65 kW for a pulse duration of 14ns represent substantial improvement and highest values for a passively Q-switched diode-pumped Tm laser operating at 1.9μm.

© 2012 Optical Society of America

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