Abstract

An efficient passively Q-switched Yb:LuAG microchip laser with Cr4+:YAG as saturable absorber was demonstrated for the first time to our knowledge. Slope efficiencies of 40% and 28% were measured for the initial transmission of Cr4+:YAG, T0=95% and 90%, respectively. Laser pulses with a pulse energy of 19μJ and a pulse width of 610ps at the repetition rate of 12.8kHz were achieved for T0=90%; the corresponding peak power of over 31kW was obtained. The lasers oscillated at two or three longitudinal modes owing to the broad emission spectra of Yb:LuAG and mode selection by Cr4+:YAG thin plate acting as an intracavity etalon.

© 2007 Optical Society of America

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