Visible Broadband Raman Lasers of H2∶CH4∶CO2 Gas Mixture Pumped by 532-nm Laser

Tiancheng Zheng; Xianglong Cai; Zhonghui Li; Chencheng Shen; Dong Liu; Jingbo Liu; Jingwei Guo

doi:10.3788/CJL202148.2101006

Chinese Journal of Lasers, Volume. 48, Issue 21, 2101006(2021)

Visible Broadband Raman Lasers of H₂∶CH₄∶CO₂Gas Mixture Pumped by 532-nm Laser

Tiancheng Zheng^1,3, Xianglong Cai^1,2, Zhonghui Li¹, Chencheng Shen^1,3, Dong Liu¹, Jingbo Liu^1、*, and Jingwei Guo^1、**

Author Affiliations

¹Key Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China

²School of Science, Changchun University of Science and Technology, Changchun, Jilin 130022, China

³University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(8)

Fig. 1. Schematic diagram of stimulated Raman scattering experimental setup

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Fig. 2. Steady-state Raman gain coefficients for H₂, CO₂, and CH₄ varying with gas pressure.(a)Forward direction; (b)backward direction

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Fig. 3. Curves of energy conversion efficiency of each order Raman component of three gases varying with pressure. (a) H₂; (b) CH₄; (c) CO₂

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Fig. 4. Energy conversion efficiency of each order Raman component of three gases varying with pump energy. (a) H₂; (b) CH₄; (c) CO₂

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Fig. 5. Curves of conversion efficiency of main Raman light varying with pump energy and laser spectrum in gas mixture. (a) Variation curve; (b) laser spectrogram

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Fig. 6. Energy level diagram and phase matching diagram for 853 nm laser generation by four-wave mixing. (a) Energy level diagram; (b) phase matching diagram

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Table 1. Parameters related to Raman gain of H₂,CH₄and CO₂at 25 ℃ and 0.5 MPa
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Table 1. Parameters related to Raman gain of H₂,CH₄and CO₂at 25 ℃ and 0.5 MPa
Gas Δυ_R /cm^-1 $\frac{d σ}{d Ω}$ / $(10^{- 31} c m^{2} \cdot S r^{- 1})$ g_FR/ $(cm \cdot G W^{- 1})$ g_BR/ $(cm \cdot G W^{- 1})$
H₂ Forward:0.0112/p+1.58p×10^-3Backward:1.768/p+1.58p×10^-3 7.9 2.157 0.0161
CH₄ 0.32+0.0118×p^a 27 0.236 0.0645
CO₂ 0.005773×p^a 2. 52^b 0.217 0.0061

Table 2. Output wavelengths of Raman laser in mixed gas

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Table 2. Output wavelengths of Raman laser in mixed gas

Wavelength /nm	Identification	Wavelength /nm	Identification
435	AS1(H₂,532 nm)	683	S1 (H₂, 532 nm)
461	AS1 (CH₄, 532 nm)	690	S1 (CH₄,574 nm); S1 (CO₂, 630 nm)
495	AS1 (CO₂, 532 nm)	754	S1 (H₂,574 nm); S1 (CO₂, 683 nm)
532	S0(pump)	771	S2 (CH₄, 532 nm)
574	S1 (CO₂, 532 nm)	853	S1 (H₂,630 nm); S1 (CH₄, 683 nm)
624*	S2 (CO₂, 532 nm)	954	S2 (H₂, 532 nm)
630*	S1 (CH₄, 532 nm)

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Tiancheng Zheng, Xianglong Cai, Zhonghui Li, Chencheng Shen, Dong Liu, Jingbo Liu, Jingwei Guo. Visible Broadband Raman Lasers of H₂∶CH₄∶CO₂Gas Mixture Pumped by 532-nm Laser[J]. Chinese Journal of Lasers, 2021, 48(21): 2101006

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