水中受激拉曼散射的能量增强及受激布里渊散射的光学抑制

史久林; 许锦; 罗宁宁; 王庆; 张余宝; 张巍巍; 何兴道

doi:10.7498/aps.68.20181548

摘要

为提高液体介质中受激拉曼散射的输出能量, 提出了通过温度调控来抑制受激布里渊散射的方法, 设计了532 nm多纵模宽带脉冲激光泵浦的受激拉曼散射发生系统, 测量了不同温度下水中前向受激拉曼散射及后向受激布里渊散射的输出能量, 分析了水温、泵浦激光线宽及热散焦效应对受激拉曼散射输出能量影响的物理机制. 实验结果表明: 通过降低水温可实现对受激布里渊散射过程的有效抑制, 同时减小热散焦效应带来的光束畸变, 从而有效提高受激拉曼散射的输出能量. 研究结果对液体介质中的受激拉曼散射多波长转换具有重要意义.

关键词:

Abstract

Stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) are two kinds of emblematic inelastic scattering processes resulting from the interaction of high-intensity laser with matter. Generally, competition between SBS and SRS is a common phenomenon in many substances. In liquid or high-pressure gas, if a single longitudinal mode laser is used as a pump source, both SBS and SRS can be excited, but the SBS will become very strong due to higher gain and optical phase conjugation. In comparison, the SRS gain is typically 2 orders of magnitude smaller than the SBS gain so that most of the pump laser energy is spent on the SBS and the SRS is greatly suppressed. To improve the output energy of SRS in liquid medium, a method of suppressing the SBS process by controlling temperature of medium is proposed. The SRS generation system using broadband pulse laser of 532 nm in wavelength as a pumping source is designed, the output energy of forward SRS (FSRS) and backward SBS (BSBS) in water with different temperatures are measured, and the physical mechanisms of the influences of water temperature, pumping linewidth and thermal defocusing on the output energy of SRS are analyzed. The experimental results indicate that by reducing the water temperature, the SBS process can be significantly suppressed, and the beam distortion caused by thermal defocusing effect can be reduced, thus effectively improving the output energy of SRS. Unlike the single longitudinal mode laser, when the pump source is handled in multiple longitudinal modes with a wide linewidth, the gain of FSRS is higher than that of the backward SRS (BSRS). Meanwhile, since the SBS gain coefficient is restricted by the linewidth of the pump laser, the FSRS process is dominant and both backward SBS and BSRS are significantly suppressed. It is necessary to state that none of the influence of backward SRS, self-focusing, optical breakdown and other non-linear effects on the output energy of SRS is considered in this paper, and only the effectiveness of reducing temperature to improve the energy output of forward SRS is verified from the perspective of temperature change. The results are of great significance for the multi-wavelength conversion of SRS in liquid medium.

Keywords:

作者及机构信息

1.
南昌航空大学, 江西省光电检测技术工程实验室, 南昌　330063

2.
南昌航空大学, 无损检测技术教育部重点实验室, 南昌　330063

通信作者: 史久林, jiulinshi@126.com ; 何兴道, xingdaohe@126.com

基金项目: 国家自然科学基金(批准号: 41776111, 41666004, 61865013, 41576033, 61665008)、江西省自然科学基金(批准号: 20171BAB202039, 20161BBH80036)、江西省杰出青年基金(批准号: 20171BCB23053)和航空基金(批准号: 2016ZD56007, 2016ZD56006)资助的课题.

Authors and contacts

1.
Jiangxi Engineering Laboratory for Optoelectronics Testing Technology, Nanchang Hangkong University, Nanchang 330063, China

2.
Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China

Corresponding author: Shi Jiu-Lin, jiulinshi@126.com ; He Xing-Dao, xingdaohe@126.com

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 41776111, 41666004, 61865013, 41576033, 61665008), the Natural Science Foundation of Jiangxi Province, China(Grant Nos. 20171BAB202039, 20161BBH80036), the Distinguished Young Fund of Jiangxi Province, China (Grant No. 20171BCB23053) and the Aeronautical Science Foundation of China (Grant Nos. 2016ZD56007, 2016ZD56006).

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参考文献

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施引文献

图 1 实验测量原理图

Fig. 1. Principle diagram of experimental measurement.

下载: 全尺寸图片幻灯片

图 2 (a)泵浦光时域轮廓; (b)水的受激拉曼散射归一化光谱图, 泵浦能量为100 mJ/Pulse

Fig. 2. (a) Temporal profile of pump leaser; (b) normalized SRS spectrum of distilled water at pump energy of 100 mJ/Pulse.

下载: 全尺寸图片幻灯片

图 3 不同温度下SRS输出能量随入射泵浦光能量变化

Fig. 3. Output energy of SRS versus the incident pump energy at different temperatures.

下载: 全尺寸图片幻灯片

图 4 不同温度下SBS输出能量随入射泵浦光能量变化

Fig. 4. Output energy of SBS versus the incident pump energy at different temperatures.

下载: 全尺寸图片幻灯片

图 5 入射泵浦能量为50 mJ时, 不同温度下水池出光口剩余泵浦光强度的远场分布轮廓 (a) 5 °C; (b) 35 °C

Fig. 5. Far-field profiles of intensity distribution of residual pump beam at the exit of the cell window at different temperatures,when the incident pump energy is 50 mJ/Pulse: (a) 5 °C; (b) 35 °C.

下载: 全尺寸图片幻灯片

图 6 入射泵浦能量为150 mJ时, 不同温度下的SRS输出光斑分布 (a) 5 °C; (b) 35 °C

Fig. 6. Facula profiles of SRS at different temperatures when the incident pump energy is 150 mJ/Pulse: (a) 5 °C; (b) 35 °C.

下载: 全尺寸图片幻灯片

map

[1]	Boyd R W 2008 Nonlinear Optics (Third Edition) (Burlington: Academic Press) pp 429-471
[2]	Penzkofer A, Laubereau A, Kaiser W 1979 Prog. Quant. Electron. 6 55 Google Scholar
[3]	Pasiskevicius V, Fragemann A, Laurell F, Butkus R, Smilgevicius V, Piskarskas A 2003 Appl. Phys. Lett. 82 325 Google Scholar
[4]	Kalosha V P, Herrmann J 2000 Phys. Rev. Lett. 85 1226 Google Scholar
[5]	Findeisen J, Eichler H J, Kaminskii A A 1998 Nonlinear Optics 98: Materials, Fundamentals and Applications Topical Meeting (Cat. No. 98CH36244), USA, August 10-14, 1998 p381
[6]	黄衍堂, 彭隆祥, 庄世坚, 李强龙, 廖廷俤, 许灿华, 段亚凡 2017 66 244208 Google Scholar Huang Y T, Peng L X, Zhuang S J, Li Q L, Liao T D, Xu C H, Duan Y F 2017 Acta Phys. Sin. 66 244208 Google Scholar
[7]	Vasa N J, Hatada A, Nakazono S, Oki Y, Maeda M 2002 Appl. Opt. 41 2328 Google Scholar
[8]	陈蔚, 陈学岗, 史久林, 何兴道, 莫小凤, 刘娟 2013 62 104213 Google Scholar Chen W, Chen X G, Shi J L, He X D, Mo X F, Liu J 2013 Acta Phys. Sin. 62 104213 Google Scholar
[9]	Woodbury E J, Ng W K 1962 Proc. Inst. Rad. Eng. 50 2367
[10]	Ganot Y, Bar I 2015 Appl. Phys. Lett. 107 131108 Google Scholar
[11]	Ganot Y, Shrenkel S, Barmashenko B D, Bar I 2014 Appl. Phys. Lett. 105 061107 Google Scholar
[12]	Helle M H, Jones T G, Penano J R, Kaganovich D, Ting A 2013 Appl. Phys. Lett. 103 121101 Google Scholar
[13]	Shi J, Chen W, Mo X, Liu J, He X, Yang K 2012 Opt. Lett. 37 2988 Google Scholar
[14]	Walsh C J, Villeneuve D M, Baldis H A 1984 Phys. Rev. Lett. 53 1445 Google Scholar
[15]	Snow J B, Qian S X, Chang R K 1985 Opt. Lett. 10 37 Google Scholar
[16]	Yehud L B, Belker D, Ravnitzki G, Ishaaya A A 2014 Opt. Lett. 39 1026 Google Scholar
[17]	Shi J, Tang Y, Wei H, Zhang L, Zhang D, Shi J, Gong W, He X, Yang K, Liu D 2012 Appl. Phys. B 108 717 Google Scholar
[18]	He X, Tang Y, Shi J, Liu J, Cheng W, Mo X 2012 J. Mod. Opt. 59 1410 Google Scholar
[19]	Shi J, Ouyang M, Chen X, Liu B, Xu Y, Jing H, Liu D 2009 Opt. Lett. 34 977 Google Scholar
[20]	Liu D, Shi J, Ouyang M, Chen X, Liu J, He X 2009 Phys. Rev. A 80 033808 Google Scholar
[21]	Shi J L, Liu J, Li S J, Jian X, Jian L, Wei F, Ke Y, He X D 2011 J. Opt. 13 075201 Google Scholar
[22]	Damzen M J, Vlad V I, Babin V, Mocofanescu A 2003 Stimulated Brillouin Scattering: Fundamentals and Applications (Bristol: Institute of Physics Pub.) pp 39-50
[23]	Colles M J 1969 Opt. Commun. 1 169 Google Scholar
[24]	Richerzhagen B, Delacretaz G, Salathe R P 1996 Opt. Eng. 35 2058 Google Scholar
[25]	Abbate G, Bernini U, Ragozzino E, Somma F 1978 J. Phy. D: Appl. Phys. 11 1167 Google Scholar

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水中受激拉曼散射的能量增强及受激布里渊散射的光学抑制