Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Picosecond Mid-Infrared 3.8 ㎛ MgO:PPLN Optical Parametric Oscillator Laser with High Peak Power

  • Chen, Bing-Yan (Jilin Key Laboratory of Solid Laser Technology and Application, College of Science, Changchun University of Science and Technology) ;
  • Wang, Yu-Heng (Jilin Key Laboratory of Solid Laser Technology and Application, College of Science, Changchun University of Science and Technology) ;
  • Yu, Yong-Ji (Jilin Key Laboratory of Solid Laser Technology and Application, College of Science, Changchun University of Science and Technology) ;
  • Jin, Guang-Yong (Jilin Key Laboratory of Solid Laser Technology and Application, College of Science, Changchun University of Science and Technology)
  • Received : 2020.12.30
  • Accepted : 2021.02.05
  • Published : 2021.04.25
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Abstract

In this study, a compact, picosecond, mid-infrared 3.8 ㎛ MgO:PPLN optical parametric oscillator (OPO) laser output with high peak power is realized using a master oscillator power amplifier (MOPA) 1 ㎛ solid-state laser seeded by a picosecond fiber laser as the pump source. The pump source was a 50 MHz and 10 ps fiber seed source. After AOM pulse selection and two-stage solid-state amplification, a 1,064 nm laser output with a repetition frequency of 1-2 MHz, pulse width of 9.5 ps, and a maximum average power of 20 W was achieved. Furthermore, a compact short cavity with a unsynchronized pump is adopted through the design of an OPO cavity structure. When the injection pump power was 15 W and the repetition frequency was 1 MHz, the average output power of idler light was 1.19 W, and the corresponding peak power was 119 kW. The optical conversion efficiency was 7.93%. When the repetition frequency was increased to 2 MHz, the average output power of idler light was 1.63 W, the corresponding peak power was 81.5 kW, and the optical conversion efficiency was 10.87%. At the same time, the output wavelength was measured at 3,806 nm, and the beam quality was MX2 = 3.21 and MY2 = 3.34.

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References

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