• Chinese Optics Letters
  • Vol. 23, Issue 6, 061401 (2025)
Hanlin Jiang1,2,3, Chao Ma1, Mingjian Wang1,3,*, Zhenzhen Yu1..., Yue Song1, Yan Feng2,3, Shiguang Li1, Jiqiao Liu1,3, Xia Hou1,3 and Weibiao Chen1,2,3|Show fewer author(s)
Author Affiliations
  • 1Wangzhijiang Innovation Center for Laser, Aerospace Laser Technology and System Department, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
  • 3Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
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    DOI: 10.3788/COL202523.061401 Cite this Article Set citation alerts
    Hanlin Jiang, Chao Ma, Mingjian Wang, Zhenzhen Yu, Yue Song, Yan Feng, Shiguang Li, Jiqiao Liu, Xia Hou, Weibiao Chen, "A kilohertz nanosecond 1645 nm KTA-OPO pumped by a 1064 nm pulse laser for methane detection," Chin. Opt. Lett. 23, 061401 (2025) Copy Citation Text show less
    (a) Schematic representation of the amplification process of the 1064 nm pump source. (b) Experimental setup diagram of the 1645 nm KTA-OPO.
    Fig. 1. (a) Schematic representation of the amplification process of the 1064 nm pump source. (b) Experimental setup diagram of the 1645 nm KTA-OPO.
    Pump beam waist spot for the 1064 nm pump light.
    Fig. 2. Pump beam waist spot for the 1064 nm pump light.
    Optical design of the OPO process.
    Fig. 3. Optical design of the OPO process.
    (a) Variation of the 1645 nm power with the pump power at 10 kHz, (b) variation of the 1645 nm power with the pump power at 9 kHz, and (c) variation of the 1645 nm power with the pump power at 8 kHz.
    Fig. 4. (a) Variation of the 1645 nm power with the pump power at 10 kHz, (b) variation of the 1645 nm power with the pump power at 9 kHz, and (c) variation of the 1645 nm power with the pump power at 8 kHz.
    Power stability of the 1645 nm signal light and the 1064 nm pump light.
    Fig. 5. Power stability of the 1645 nm signal light and the 1064 nm pump light.
    (a) Thermal imager observation of the temperature of the KTA crystals at T = 0 min. (b) Thermal imager observation of the temperature of the KTA crystals at T = 60 min.
    Fig. 6. (a) Thermal imager observation of the temperature of the KTA crystals at T = 0 min. (b) Thermal imager observation of the temperature of the KTA crystals at T = 60 min.
    (a) Pulse duration of the 1645 nm signal light. (b) 10 kHz repetition rate of the 1645 nm signal light.
    Fig. 7. (a) Pulse duration of the 1645 nm signal light. (b) 10 kHz repetition rate of the 1645 nm signal light.
    Spectrogram of the 1645 nm laser spectrum measured by a YOKOGAWA spectrometer.
    Fig. 8. Spectrogram of the 1645 nm laser spectrum measured by a YOKOGAWA spectrometer.
    Relationship between the rotation angle and the tuning wavelength of the KTA crystal.
    Fig. 9. Relationship between the rotation angle and the tuning wavelength of the KTA crystal.
    Near-field spot of the 1645 nm signal light.
    Fig. 10. Near-field spot of the 1645 nm signal light.
    Beam quality factor of the 1645 nm signal beam measured by the Spiricon M2-200 s.
    Fig. 11. Beam quality factor of the 1645 nm signal beam measured by the Spiricon M2-200 s.
    Hanlin Jiang, Chao Ma, Mingjian Wang, Zhenzhen Yu, Yue Song, Yan Feng, Shiguang Li, Jiqiao Liu, Xia Hou, Weibiao Chen, "A kilohertz nanosecond 1645 nm KTA-OPO pumped by a 1064 nm pulse laser for methane detection," Chin. Opt. Lett. 23, 061401 (2025)
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