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Mid-infrared self-Q-switched Er, Pr:CaF<sub>2</sub> diode-pumped laser.
Optics Letters 2016 October 16
A diode-end-pumped self-Q-switched mid-infrared laser was demonstrated with Er<sup>3+</sup>, Pr<sup>3+</sup> co-doped CaF<sub>2</sub> crystal for, to the best of our knowledge, the first time. Maximum average output power of 262 mW was achieved and the corresponding slope efficiency was 14.9%. Stable self-Q-switched laser pulses as short as 718 ns were obtained with a repetition rate of 52.63 kHz at the center wavelength of 2803.7 nm. This highly compact nanosecond laser using a 3 at. % Er<sup>3+</sup> and 0.03 at. % Pr<sup>3+</sup> co-doped CaF<sub>2</sub> crystal is free from any active or passive modulators in cavity, potentially promising for a micro and integrated diode-pumped mid-infrared laser system.
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