Abstract
Pulsed laser sources for space applications such as doppler wind lidar require excellent performances including high beam quality and single longitudinal mode (SLM) operation. In conventional lasers, thermally induced phase distortions often corrupt the beam quality at high-power and/or high energy. SLM operation is obtained by injection seeding with an electronic feedback loop control that permits to adjust the cavity length of the oscillator on that of the seed laser. It has been shown that self-adaptive laser resonators (SALR), in which phase conjugation, or more generally, four-wave mixing, is self generated by the intra-cavity field, allow to obtain excellent beam quality, self Q-switching, and SLM operation [1,2]· However, the optical frequency of SALR can change from pulse to pulse due to environment pertubations. In this communication we report on a new scheme to lock the frequency of the SALR on the frequency of a reference low power cw laser with no piezo-mirror to control the cavity length and no electronic feedback loop control.
© 2007 IEEE
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