Abstract
We report, what is to our knowledge, the first passively Q-switched operation of a 2.3-μm laser by using a saturable absorber. In the experiments, a tunable laser was used to end pump the gain medium inside an cavity. A saturable absorber was also included in the cavity to initiate passive Q switching. At all pump power levels above lasing threshold, passively Q-switched operation of the laser could be obtained at 2309 nm with pulse durations and repetition frequencies in the ranges of 1.2–1.4 μs and 0.3–2.1 kHz, respectively. Analysis of power dependent repetition rate data further gave an estimated value of 3.1% for the round-trip saturable loss of the saturable absorber.
© 2017 Optical Society of America
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