Abstract
We report self-Q-switching operation in a diode-pumped Tm:YLF bulk laser by exploiting saturable re-absorption under the quasi-three-level regime. Robust self-Q-switched pulse output at 1.91μm in fundamental mode is demonstrated experimentally with 1.5at.% doped Tm:YLF crystal. At maximum absorbed pump power of 4.5W, the average output power and pulse energy are obtained as high as 610mW and 29μJ, respectively, with the corresponding slope efficiency of 22%. Pulse repetition rate is tunable in the range of 3–21kHz with changing the pump power. The dynamics of self-Q-switching of Tm:YLF laser are discussed with the help of a rate equation model showing good agreement with the experiment. The compact self-Q-switched laser near 2 μm has potential application in laser radar systems for accurate wind velocity measurements.
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