Abstract

A laser-diode-pumped watt-level single-frequency combined actively and passively Q-switched (CAPQ) laser with a wavelength of 1064  nm that simultaneously uses a codoped Cr4+,Nd3+:YAG crystal as the gain medium and mode selector is presented. The optimum repetition period of the CAPQ laser is approximately 1.5 times the natural repetition period of the passively Q-switched laser. The averaged timing jitter is approximately 400   ns in the CAPQ laser and the repetition rate of the CAPQ laser is experimentally shown to reach a time instability of 0 .2% over 106 pulses. The output is a stable single frequency with a linewidth of 400  MHz at 20   W pump power.

© 2006 Optical Society of America

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