Abstract
A passively Q-switched Nd:YAG undirectional ring laser with external feedback is reported. The laser generates 50ns single-axial-mode pulses up to 6kHz, with energy 34μJ, M2<1.05, and pulse jitter <50 ns rms, which is quite remarkable for this class of devices. Jitter was effectively minimized by using relatively high-peak-power pump pulses of 10W, in agreement with a model considering both pump fluctuations and spontaneous emission noise. This represents an improvement by a factor of 8 with respect to a similar laser device we recently reported.
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