• Chinese Journal of Quantum Electronics
  • Vol. 40, Issue 4, 483 (2023)
TANG Jingling1,2, QI Yue1,2, BAI Zhenxu1,2,*, QI Yaoyao1,2..., DING Jie1,2, YAN Bingzheng1,2, WANG Yulei1,2 and LYU Zhiwei1,2|Show fewer author(s)
Author Affiliations
  • 1Center for Advanced Laser Technology, Hebei University of Technology, Tianjin 300401, China
  • 2Hebei Key Laboratory of Advanced Laser Technology and Equipment, Tianjin 300401, China
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    DOI: 10.3969/j.issn.1007-5461.2023.04.007 Cite this Article
    Jingling TANG, Yue QI, Zhenxu BAI, Yaoyao QI, Jie DING, Bingzheng YAN, Yulei WANG, Zhiwei LYU. Passively Q⁃switched sub⁃nanosecond laser based on YAG/Nd: YAG/Cr4+: YAG composite crystal[J]. Chinese Journal of Quantum Electronics, 2023, 40(4): 483 Copy Citation Text show less
    (a)-(d) Schematic of laser crystal; (e)-(h) Pin=10.72 W, Schematic diagram of temperature distribution inside laser crystals; (i)-(l) Pin=10.72 W, Schematic diagram of thermal stress distribution of laser crystals
    Fig. 1. (a)-(d) Schematic of laser crystal; (e)-(h) Pin=10.72 W, Schematic diagram of temperature distribution inside laser crystals; (i)-(l) Pin=10.72 W, Schematic diagram of thermal stress distribution of laser crystals
    (a) Experimental setup; (b) Physical diagram of composite crystal YAG/Nd: YAG/Cr4+: YAG
    Fig. 2. (a) Experimental setup; (b) Physical diagram of composite crystal YAG/Nd: YAG/Cr4+: YAG
    (a) Average output power versus pump power; (b) Pulse duration versus pump power
    Fig. 3. (a) Average output power versus pump power; (b) Pulse duration versus pump power
    Schematic diagram of single pulse trace (10 ns/div)
    Fig. 4. Schematic diagram of single pulse trace (10 ns/div)
    Repetition rate versus pump power
    Fig. 5. Repetition rate versus pump power
    Laser's beam distribution versus pump power (a) 3.8 W; (b) 10.72 W; (c) 13.5 W; (d) 14.8 W; (e)16.7 W; (f) 17.8 W
    Fig. 6. Laser's beam distribution versus pump power (a) 3.8 W; (b) 10.72 W; (c) 13.5 W; (d) 14.8 W; (e)16.7 W; (f) 17.8 W
    Schematic diagram of beam quality factor
    Fig. 7. Schematic diagram of beam quality factor
    End face diagram of composite crystal
    Fig. 8. End face diagram of composite crystal
    Laser's beam distribution versus focus position
    Fig. 9. Laser's beam distribution versus focus position
    Laser's threshold versus focus position (insert: focus position along crystal axis)
    Fig. 10. Laser's threshold versus focus position (insert: focus position along crystal axis)
    ParameterComposite crystal
    Nd: YAGYAG/Nd: YAGNd: YAG/ YAGYAG/Nd: YAG/ YAG
    Crystal length/mm72+55+21+5+1
    Table 1. Laser crystal's length
    Output parameterComposite crystal
    Nd: YAGYAG/Nd: YAGNd: YAG/ YAGYAG/Nd: YAG/ YAG
    Threshold/W3.013.173.23.2
    Output power/W5.034.924.784.83
    Thermal focal length/mm27.6933.9529.8834.49
    Spot radius/μm56.6058.2059.6060.80
    Beam quality M21.191.131.751.17
    Table 2. Simulation results of laser output characteristics corresponding to different composite crystals
    Measured parameterComposite crystal
    YAG/Nd: YAG/Cr4+: YAGYAG/Nd: YAG/Cr4+: YAG/YAG[16]YAG/Nd: YAG/Cr4+: YAG[14]
    Crystal size/mm33×3×(2+5+2)3×3×(1+7+1+1)3×3×(2+5.5+1.5)
    Cavity length/mm91025
    Single pulse energy/μJ69118.2425.8
    Pulse width/ns1.421.231.9
    M 21.131.181.7
    Table 3. Comparison of simulation result of YAG/Nd: YAG/Cr4+: YAG passively Q⁃switched lasers and other research results
    Jingling TANG, Yue QI, Zhenxu BAI, Yaoyao QI, Jie DING, Bingzheng YAN, Yulei WANG, Zhiwei LYU. Passively Q⁃switched sub⁃nanosecond laser based on YAG/Nd: YAG/Cr4+: YAG composite crystal[J]. Chinese Journal of Quantum Electronics, 2023, 40(4): 483
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