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  • Received: Oct. 31, 2019

    Accepted: Dec. 11, 2019

    Posted: Mar. 9, 2020

    Published Online: Mar. 10, 2020

    The Author Email: Qiang Liu (qiangliu@mail.tsinghua.edu.cn)

    DOI: 10.3788/COL202018.031403

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    Hengkang Zhang, Encai Ji, Bin Zhang, Yi Chen, Baoquan Yao, Qiang Liu. Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho3+:YAG laser pumped gain-switched Cr2+:CdSe laser[J]. Chinese Optics Letters, 2020, 18(3): 031403

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Chinese Optics Letters, Vol. 18, Issue 3, 031403 (2020)

Generation of nanosecond 2.65 μm pulses and pulse narrowing in fiber-bulk Ho3+:YAG laser pumped gain-switched Cr2+:CdSe laser

Hengkang Zhang1,2, Encai Ji3, Bin Zhang1,2, Yi Chen4, Baoquan Yao4, and Qiang Liu1,2,*

Author Affiliations

  • 1Key Laboratory of Photonic Control Technology (Tsinghua University), Ministry of Education, Beijing 100084, China
  • 2State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  • 3School of Electronic and Information Engineering, Harbin Institute of Technology, Shenzhen 518055, China
  • 4National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China

Abstract

The generation of mid-infrared pulsed lasers was achieved in a Ho3+:YAG laser pumped gain-switched Cr2+:CdSe laser system with the shortest pulse duration of 4.15 ns. With a pump pulse duration of 50 ns and pump power of 2.7 W, the gain-switched Cr2+:CdSe laser achieved over 10 times pulse narrowing, obtaining the maximum peak power of 5.7 kW. The optical-to-optical conversion efficiency was 3.7%, which could be further improved with better crystal surface polishing quality. The laser central wavelength was measured to be 2.65 μm with a bandwidth (FWHM) of 50 nm. In addition, the parameter optimization for suppressing the pulse tail was discussed, while the long cavity and high output transmissivity contributed to obtaining the single-peak pulses.

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