<styled-content style-type="number">1064</styled-content> nm泵浦乙烷1.55 μm拉曼激光研究

王海洋; 徐明; 蔡向龙; 刘栋; 孙景露; 钱飞宇; 李俊涛; 郭敬为

doi:10.11884/HPLPB202537.240232

1064 nm泵浦乙烷1.55 μm拉曼激光研究

doi: 10.11884/HPLPB202537.240232

王海洋^{1, 3,},
徐明¹,
蔡向龙¹,
刘栋¹,
孙景露^{1, 3},
钱飞宇^{1, 2},
李俊涛^{1, 3},
郭敬为^1, ,

1.
中国科学院大连化学物理研究所化学激光重点实验室，大连 116023
2.
中国科学技术大学化学与材料科学学院，合肥 230026
3.
中国科学院大学，北京 100049

基金项目: 一体化多波长高脉冲能量激光技术研究（5091401010112）

详细信息

作者简介:
王海洋，359379146@qq.com

通讯作者:
郭敬为，jingweiguo@dicp.ac.cn。

中图分类号: TN248
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- 被引次数: 0
出版历程
- 收稿日期: 2024-07-17
- 修回日期: 2024-12-02
- 录用日期: 2024-11-04
- 网络出版日期: 2024-12-09

Study on 1.55 μm Raman laser in ethane gas pumped by 1064 nm pulsed laser

Wang Haiyang^{1, 3
,},
Xu Ming¹,
Cai Xianglong¹,
Liu Dong¹,
Sun Jinglu^{1, 3},
Qian Feiyu^{1, 2},
Li Juntao^{1, 3},
Guo Jingwei^{1
, ,}

1.
Key Laboratory of Chemical Lasers, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
2.
School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 受激拉曼散射（SRS）作为一种高效的激光频率改变方法，受到广泛关注。但是拉曼激光也存在着明显的不足，其波长缺少连续调谐的能力，因此需要开发更多的拉曼活性介质，提高拉曼频移覆盖密度。以波长为1064 nm的激光作为泵浦源，以高压乙烷作为拉曼活性介质，产生了波长为1550 nm的一阶拉曼（S₁），实验过程中未发现明显后向拉曼和高阶拉曼，通过优化实验条件，降低激光诱导击穿（LIB），使S₁的光子转化效率提高到了20.7%，最高脉冲能量达到21.2 mJ。并且首次测量了乙烷对1.55 μm激光的吸收系数和吸收截面，它们分别是5.71$ \times {{10}}^{-{8}} $ m⁻¹ Pa⁻¹和$ {2.35} \times {{10}}^{-{24}}{\text{ cm}}^{{2}} $。
- 受激拉曼散射 /
- 1.55μm激光 /
- 转化效率 /
- 吸收系数 /
- 乙烷
Abstract: Stimulated Raman scattering is an effective non-linear frequency conversion method, and has received much attention. However, Raman lasers also have drawbacks, such as wavelength of Raman lasers could not be tuned continuously, therefore, the coverage of Raman laser wavelength is limited. So more Raman active media are required to improve the coverage of Raman lasers. In this work, 1064 nm laser was used as pump source, and pressurized ethane was used as Raman active medium, and 1550 nm Raman laser was produced. No obvious backward Raman laser, nor higher orders of Stokes Raman lasers were observed in this experiment. By the optimization of experimental parameters, laser induced breakdown was meliorated; S₁ Raman laser photon conversion efficiency was improved to 20.7%, and the maximum S₁ energy was 21.2 mJ. Ethane was found having significant absorption at wavelength of 1550 nm, this was the major reason for the limited photon conversion efficiency and pulse energy of S₁ Raman laser. The absorption coefficient of ethane at 1550 nm was measured to be 5.71$ \times {{10}}^{-{8}} $ m⁻¹ Pa⁻¹, and the absorption cross section was measured to be $ {2.3}{5} \times {{10}}^{-{24}}{\text{ cm}}^{{2}} $.
- stimulated Raman scattering /
- 1.55 μm laser /
- conversion efficiency /
- absorption coefficient /
- ethane

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图 1 实验装置示意图

Figure 1. Schematic diagrams of experimental setup

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图 2 使用f₁=1.0m单透镜聚焦时，不同乙烷气压条件下S₁光子转化效率随着泵浦激光脉冲能量变化曲线

Figure 2. S₁ photon conversion efficiencies of ethane under different pump energies and ethane pressures with single f₁=1.0 m focal lens

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图 3 不同焦距透镜聚焦条件下S₁光子转化效率随着泵浦激光脉冲能量变化曲线

Figure 3. S₁ photon conversion efficiencies of ethane under different pump energies and focal lens

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图 4 使用双次聚焦条件下S₁光子转化效率随着泵浦激光脉冲能量变化曲线

Figure 4. S₁ photon conversion efficiencies of ethane under double focusing configuration

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图 5 不同焦距透镜聚焦条件下归一化总光子转化效率随泵浦激光脉冲能量变化的曲线

Figure 5. Normalized total photon number curves under different focus configurations

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图 6 不同气压条件下乙烷对1.55 μm激光的吸收曲线

Figure 6. Effect of ethane on 1.55 μm laser under different pressure

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表 1 经过吸收池后脉冲能量和透过率随乙烷气压的变化

Table 1. Residual 1.55 μm energiesand transmission rates after passing through the absorption cell under different ethane pressures

pressure/MPa	pulse energy after passing through the absorption pool/mJ	transmission rate $ {T_{\text{r}}} $	$ \lg \left( {\dfrac{1}{{{T_{\text{r}}}}}} \right) $
2.0	5.82	0.62	0.20
1.8	6.28	0.67	0.17
1.6	6.63	0.70	0.15
1.4	6.89	0.73	0.13
1.2	7.18	0.76	0.11
1.0	7.73	0.82	0.08

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