温度对飞秒激光脉冲在NaCl溶液中成丝产生的超连续谱的影响

李贺; 陈安民; 于丹; 李苏宇; 金明星

doi:10.7498/aps.67.20180686

摘要

利用飞秒激光脉冲在NaCl溶液中成丝，研究了溶液温度对飞秒激光成丝过程中产生的超连续谱的影响.发现在激光脉冲能量较低时，溶液温度对超连续谱的影响几乎可以忽略；而在激光脉冲能量较高时，随着NaCl溶液温度的升高，超连续谱呈现出被压缩的趋势.此外，在激光脉冲能量较高的情况下，NaCl中会产生大量的气泡.通过分析，得出了飞秒激光在溶液中成丝产生的气泡是影响超连续谱发射的主要因素.

关键词:

Supercontinuum generation is an important nonlinear phenomenon that occurs during the femtosecond laser filamentation in transparent medium, and its potential and promising applications like remote sensing, biomedical imaging and generation of few-cycle femtosecond pulses, etc. have aroused a great deal of interest. With the extensive and thorough theoretical simulation and experimental research of the supercontinuum generation in air, the mechanism of the supercontinuum induced by femtosecond laser filament in gaseous medium has become clear. However, the femtosecond laser filament-induced supercontinuum in liquid is still an open question. In this work, by taking NaCl solution for example, we investigate the influence of solution temperature on the supercontinuum induced by the femtosecond laser filamentation in solution. It is found that when the laser pulse energy is relatively low (e.g. 20 and 50 J), the influence of solution temperature on supercontinuum generation can be neglected. In contrast, when the laser pulse energy is relatively high (e.g. 200 J), with the increase of solution temperature, the supercontinuum generation shows a suppression tendency. The water molecules in NaCl solution are photo-ionized due to the high intensity of femtosecond laser filament, generating a great deal of oxygen (O2), hydrogen (H2) and water vapor (H2O), and thus forming bubbles that float upwards. In the case of lower pulse energy, the multi-photon ionization rate is low, therefore, only a few bubbles are generated, and they are small in size, which hardly affects the supercontinuum generation. In the case of higher pulse energy, a large number of bubbles can be observed in the NaCl solution, and their sizes become increasingly large when the temperature of NaCl solution increases. The generation of bubbles leads to the reflection and refraction of light, which inevitably influences the spectral intensity. Furthermore, the components (e.g. O2, H2 and H2O) in the bubbles also absorb the supercontinuum, which further lowers the spectral intensity. This work reveals that the main factors leading to the supercontinuum suppression in solution can be attributed to the generation of bubbles during femtosecond laser filamentation and the scattering and absorption of light caused by water vapor in bubbles. When we detect the components in solution via the femtosecond laser filament-induced supercontiunum, the influence of tempera-ture can be effectively eliminated by adjusting the incident pulse energy. Moreover, in the case of high pulse energy, the supercontinuum generation can be controlled by adjusting the solution temperature. This study is conducible to the application of supercontinuum as well as its generation.

Keywords:

作者及机构信息

1.
吉林大学电子科学与工程学院, 长春 130012;

2.
吉林大学原子与分子物理研究所, 长春 130012;

3.
吉林省应用原子分子光谱重点实验室, 长春 130012;

4.
中国人民解放军空军航空大学, 长春 130022

通信作者: 李苏宇, sylee@jlu.edu.cn;mxjin@jlu.edu.cn ; 金明星, sylee@jlu.edu.cn;mxjin@jlu.edu.cn

基金项目: 国家自然科学基金（批准号：11704145，11474129，11674124）和中国博士后科学基金（批准号：2017M610190）资助的课题.

Authors and contacts

1.
College of Electronic Science and Engineering, Jilin University, Changchun 130012, China;

2.
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;

3.
Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy, Changchun 130012, China;

4.
Aviation University of Air Force, Changchun 130022, China

Corresponding author: Li Su-Yu, sylee@jlu.edu.cn;mxjin@jlu.edu.cn ; Jin Ming-Xing, sylee@jlu.edu.cn;mxjin@jlu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11704145, 11474129, 11674124) and the China Postdoctoral Science Foundation (Grant No. 2017M610190).

参考文献

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[6]	Li S Y, Guo F M, Yang Y J, Jin M X 2015 Chin. Phys. B 24 114207
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[16]	Li H, Shi Z, Wang X W, Sui L Z, Li S Y, Jin M X 2017 Chem. Phys. Lett. 681 86
[17]	Qin Y D, Zhu C J, Yang H, Gong Q H 2000 Chin. Phys. Lett. 17 413
[18]	Li D, Zhang L, Zafar S, Song H, Hao Z, Xi T, Gao X, Lin J 2017 Chin. Phys. B 26 074213
[19]	Luo Q, Liu W, Chin S L 2003 Appl. Phys. B 76 337
[20]	Yao J P, Zeng B, Xu H L, Zhang H S, Chin S L, Cheng Y, Xu Z Z 2011 Phys. Rev. A 84 051802
[21]	Mitryukovskiy S, Liu Y, Ding P J, Houard A, Mysyrowicz A 2014 Opt. Express 22 12750
[22]	Kasparian J, Rodriguez M, Mjean G, Yu J, Salmon E, Wille H, Bourayou R, Frey S, Andr Y B, Mysyrowicz A, Sauerbrey R, Wolf J P, Wste L 2003 Science 301 61
[23]	Tu H, Boppart S A 2013 Laser Photon. Rev. 7 628
[24]	Berg L, Rolle J, Khler C 2013 Phys. Rev. A 88 023816
[25]	Xu F, Liu J S, Li R X, Xu Z Z 2007 Chin. Opt. Lett. 5 490
[26]	Gaeta A L 2000 Phys. Rev. Lett. 84 3582
[27]	Liu W, Petit S, Becker A, Akozbek N, Bowdenb C M, Chin S L 2002 Opt. Commun. 202 189
[28]	Kandidov V P, Kosareva O G, Golubtsov I S, Liu W, Becker A, Akozbek N, Bowden C M, Chin S L 2003 Appl. Phys. B 77 149
[29]	Santhosh C, Dharmadhikari A K, Dharmadhikari J, Alti K, Mathur D 2010 Appl. Phys. B 99 427
[30]	Cui Q N, Yao J P, Ni J L, Cheng Y 2012 J. Opt. 14 075205
[31]	Lagac S, Chin S L 1996 Appl. Opt. 35 907
[32]	Mizushima Y, Saito T 2015 Appl. Phys. Lett. 107 114102

施引文献

[1]	Fork R L, Shank C V, Hirlimann C, Yen R, Tomlinson W J 1983 Opt. Lett. 8 1
[2]	Braun A, Korn G, Liu X, Du D, Squier J, Mourou G 1995 Opt. Lett. 20 73
[3]	Couairona A, Mysyrowicz A 2007 Phys. Rep. 441 47
[4]	Chin S L, Wang T J, Marceau C, Wu J, Liu J S, Kosareva O, Panov N, Chen Y P, Daigle J F, Yuan S, Azarm A, Liu W W, Seideman T, Zeng H P, Richardson M, Li R, Xu Z Z 2012 Laser Phys. 22 1
[5]	Couairon A, Brambilla E, Corti T, Majus D, Ramrez-Gngora O D J, Kolesik M 2011 Eur. Phys. J. Special Topics 199 5
[6]	Li S Y, Guo F M, Yang Y J, Jin M X 2015 Chin. Phys. B 24 114207
[7]	Liu W W 2014 Chin. J. Phys. 52 465
[8]	Xu H, Cheng Y, Chin S L, Sun H B 2015 Laser Photon. Rev. 9 275
[9]	Li H, Li S Y, Li S C, Liu D L, Tian D, Chen A M, Wang Y, Wang X W, Zhang Y F, Jin M X 2016 High Power Laser Sci. Eng. 4 e7
[10]	Shi Y, Chen A, Jiang Y, Li S, Jin M 2016 Opt. Commun. 367 174
[11]	Li M, Li A Y, He B Q, Yuan S, Zeng H P 2016 Chin. Phys. B 25 044209
[12]	Wang T J, Yuan S, Chen Y P, Chin S L 2013 Chin. Opt. Lett. 11 011401
[13]	Zhang Z, Chen Y, Chen M, Zhang Z, Yu J, Sheng Z, Zhang J 2016 Phys. Rev. Lett. 117 243901
[14]	Zhao J, Guo L, Chu W, Zeng B, Gao H, Cheng Y, Liu W 2015 Opt. Lett. 40 3838
[15]	Liu Z Y, Ding B W, Hu B T 2013 Chin. Phys. B 22 075204
[16]	Li H, Shi Z, Wang X W, Sui L Z, Li S Y, Jin M X 2017 Chem. Phys. Lett. 681 86
[17]	Qin Y D, Zhu C J, Yang H, Gong Q H 2000 Chin. Phys. Lett. 17 413
[18]	Li D, Zhang L, Zafar S, Song H, Hao Z, Xi T, Gao X, Lin J 2017 Chin. Phys. B 26 074213
[19]	Luo Q, Liu W, Chin S L 2003 Appl. Phys. B 76 337
[20]	Yao J P, Zeng B, Xu H L, Zhang H S, Chin S L, Cheng Y, Xu Z Z 2011 Phys. Rev. A 84 051802
[21]	Mitryukovskiy S, Liu Y, Ding P J, Houard A, Mysyrowicz A 2014 Opt. Express 22 12750
[22]	Kasparian J, Rodriguez M, Mjean G, Yu J, Salmon E, Wille H, Bourayou R, Frey S, Andr Y B, Mysyrowicz A, Sauerbrey R, Wolf J P, Wste L 2003 Science 301 61
[23]	Tu H, Boppart S A 2013 Laser Photon. Rev. 7 628
[24]	Berg L, Rolle J, Khler C 2013 Phys. Rev. A 88 023816
[25]	Xu F, Liu J S, Li R X, Xu Z Z 2007 Chin. Opt. Lett. 5 490
[26]	Gaeta A L 2000 Phys. Rev. Lett. 84 3582
[27]	Liu W, Petit S, Becker A, Akozbek N, Bowdenb C M, Chin S L 2002 Opt. Commun. 202 189
[28]	Kandidov V P, Kosareva O G, Golubtsov I S, Liu W, Becker A, Akozbek N, Bowden C M, Chin S L 2003 Appl. Phys. B 77 149
[29]	Santhosh C, Dharmadhikari A K, Dharmadhikari J, Alti K, Mathur D 2010 Appl. Phys. B 99 427
[30]	Cui Q N, Yao J P, Ni J L, Cheng Y 2012 J. Opt. 14 075205
[31]	Lagac S, Chin S L 1996 Appl. Opt. 35 907
[32]	Mizushima Y, Saito T 2015 Appl. Phys. Lett. 107 114102

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