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2.3-μm Tm<sup>3+</sup>:YLF laser passively Q-switched with a Cr<sup>2+</sup>:ZnSe saturable absorber.
Optics Letters 2017 May 2
We report, what is to our knowledge, the first passively Q-switched operation of a 2.3-μm Tm<sup>3+</sup>:YLF laser by using a Cr<sup>2+</sup>:ZnSe saturable absorber. In the experiments, a tunable Ti<sup>3+</sup>:sapphire laser was used to end pump the Tm<sup>3+</sup>:YLF gain medium inside an x cavity. A Cr<sup>2+</sup>:ZnSe 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 Tm<sup>3+</sup>:YLF 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 Cr<sup>2+</sup>:ZnSe saturable absorber.
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