Lü Xinjie, Bin Yang, Hongquan Yao, Xiaohan Wang, Hui Wu, Lingbing Bu, Shining Zhu. Dual-Wavelength Mid-Infrared Laser for Long-Range Gas Detection (Invited)[J]. Laser & Optoelectronics Progress, 2024, 61(1): 0114001
- Laser & Optoelectronics Progress
- Vol. 61, Issue 1, 0114001 (2024)
Fig. 1. Absorption lines of NO, NO2, and SO2 in the 2.6‒4.0 μm range
Fig. 2. Wavelength tunning of PPLN-OPO
Fig. 3. System schematic diagram
Fig. 4. Engineering of pump lasers
Fig. 5. Single-pulse waveform of pump laser
Fig. 6. Optical path and engineering design of dual-wavelength OPO
Fig. 7. OPO structure design. (a) ON-OPO design drawing; (b) ON-OPO physical drawing; (c) OFF-OPO design drawing; (d) OFF-OPO physical drawing
Fig. 8. Signal optical spectra of OPO. (a) Signal optical spectrum diagram of free-running OPO; (b) signal optical spectrum of OPO after seed injection
Fig. 9. Energy curves of ON-OPO
Fig. 10. Comparison between actual mass concentration and detected mass concentration[17]
Fig. 11. Measurement results of dynamic emissions［17］
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Table 1. ON-OFF wavelength and corresponding PPLN period
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Table 2. Spectra and absorption effects of different OPO mirrors' reflectance
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