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2-μm Cr2+: CdSe passively Q-switched laser
Author(s): E. C. Ji; Q. Liu; Y. Yao; S. Lu; Q. T. Lue
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Paper 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 8.97×10-20 cm2, 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.

Paper Details

Date Published: 15 February 2018
PDF: 7 pages
Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105110Z (15 February 2018); doi: 10.1117/12.2284294
Show Author Affiliations
E. C. Ji, Harbin Institute of Technology (China)
Tsinghua Univ. (China)
Han's Laser Technology Co., Ltd. (China)
Q. Liu, Tsinghua Univ. (China)
Y. Yao, Harbin Institute of Technology (China)
S. Lu, Harbin Institute of Technology (China)
Han's Laser Technology Co., Ltd. (China)
Q. T. Lue, Harbin Institute of Technology (China)


Published in SPIE Proceedings Vol. 10511:
Solid State Lasers XXVII: Technology and Devices
W. Andrew Clarkson; Ramesh K. Shori, Editor(s)

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