2-μm Cr2+: CdSe passively Q-switched laser

E. C. Ji; Q. Liu; Y. Yao; S. Lu; Q. T. Lue

doi:10.1117/12.2284294

15 February 2018 2-μm Cr²⁺: CdSe passively Q-switched laser

E. C. Ji, Q. Liu, Y. Yao, S. Lu, Q. T. Lue

Proceedings Volume 10511, Solid State Lasers XXVII: Technology and Devices; 105110Z (2018) https://doi.org/10.1117/12.2284294
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

We demonstrate the bleaching characteristics of Cr²⁺: CdSe (Cr: CdSe) crystal around 2 μm and prove that Cr: CdSe crystal is an effective saturable absorber to obtain Q-switched pulsed output in Tm³⁺-doped fiber laser pumped Ho: YAG system. The saturable absorption property of Cr: CdSe is investigated with a pulsed source at 2090 nm. The laserinduced damage threshold of uncoated Cr: CdSe is estimated around 9.92 J/cm² at 2090 nm with the pulse duration of 30 ns. With the measured bleaching curve, the estimated pulse saturation fluence is around 1.06 J/cm², and the estimated ground-state absorption cross section is 8.97×10^-20cm², which is very close to the experimental value. The preliminary laser experiments are all finished with an antireflection coated Cr: CdSe crystal to reduce the insertion loss. The maximum output pulse energy is about 1.8 mJ with repetition frequency of 685 Hz, pulse duration of 15.4 ns, and pulse peak power of 115 kW. The pulsed laser wavelength is measured to be 2090.2 nm.

Conference Presentation

Citation Download Citation

E. C. Ji, Q. Liu, Y. Yao, S. Lu, and Q. T. Lue "2-μm Cr²⁺: CdSe passively Q-switched laser", Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105110Z (15 February 2018); https://doi.org/10.1117/12.2284294

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