强飞秒激光大气传输成丝特性研究

J4 ›› 2011, Vol. 28 ›› Issue (5): 544-550.

强飞秒激光大气传输成丝特性研究

王海涛范承玉乔春红张京会张鹏飞马慧敏

中国科学院安徽光学精密机械研究所大气成分与光学重点实验室, 安徽合肥 230031

出版日期:2011-09-28 发布日期:2011-08-18
通讯作者: 范承玉（1965- ）博士生导师，研究员，主要从事激光大气传输与自适应光学校正方面的研究。 E-mail:cyfan@aiofm.ac.cn
作者简介:王海涛（1982-）博士生，主要从事飞秒激光传输方面的研究。E-mail:haitaow@mail.ustc.edu.cn
基金资助:
国家高技术研究发展计划(批准号：A825021，A825011)和中国科学院合肥物质科学研究院计算科学中心（0330405002-7）资助

Properties of filamentation of intense femtosecond laser pulses propagation in air

WANG Hai-Tao, Fan Cheng-Yu, QIAO Chun-Hong, ZHANG Jing-Hui, ZHANG Peng-Fei, MA Hui-Min

Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

Published:2011-09-28 Online:2011-08-18

摘要/Abstract

摘要：

基于对强飞秒激光大气传输的非线性薛定谔方程的变分法，模拟研究飞秒激光大气传输成丝特性.研究了在是否考虑多光子吸收损耗的情况下，激光成丝状态的演化。研究表明：多光子吸收损耗会破坏自聚焦与等离子体散焦之间的动态平衡，进而引起成丝的不稳定性；在不同的入射功率下，成丝的起点位置会发生移动；在实验室条件下，Pin大于等于3Pcr 时才可能形成多次聚焦成丝传输。在继续增加激光入射功率时，光束因强烈聚焦发生崩塌而成多丝结构。

关键词: 激光技术, 自聚焦, 等离子体散焦, 飞秒激光成丝, 多光子吸收

Abstract:

Based on the variational principle of nonlinear shrödinger(NLS) equation describing laser pulses propagation in air, the properties of femtosecond filaments have been studied by using numerical simulation method. Numerical results were derived on the developing process of filamentation under the situations of whether or not taking account of multiphoton absorption dissipation (MPA). It shows that a dynamic equilibrium between optical self-focusing and plasma defocusing will be broken due to the MPA, which will induce instability of femtosecond filamentation. The first foci of the filaments are displaced for different incidence laser power. Further investigate reveals that stably filamentation propagation described by defocusing-refocusing cycles can only arise for power in laboratory. With the incidence power gradually increasing, the beam will undergo optical collapse due to intense focusing, and then the formation of femtosecond multiple filamentation(MF) can be obtained.

Key words: laser techniques, self-focusing, plasmas defocusing, femtosecond laser filamentation, multiphoton absorption

中图分类号:

O437

王海涛范承玉乔春红张京会张鹏飞马慧敏. 强飞秒激光大气传输成丝特性研究[J]. J4, 2011, 28(5): 544-550.

WANG Hai-Tao, Fan Cheng-Yu, QIAO Chun-Hong, ZHANG Jing-Hui, ZHANG Peng-Fei, MA Hui-Min. Properties of filamentation of intense femtosecond laser pulses propagation in air[J]. J4, 2011, 28(5): 544-550.

参考文献

[1] Ackermann R, Salmon E, Lascoux N, et al. Optimal control of filamentation in air[J]. Appl. Phys. Lett, 2006, 89, 171117.
[2] A. Couairon, and A. Mysyrowicz, Femtosecond filamentation in transparent media[J]. Phys. Rep. 441(2-4), 47–189 (2007).
[3] Wöste L,Wedekind C, Wille H, et al. Femtosecond atmospheric lamp[J]. Laser und Optoelektronik , 1997, 29 (5):51–53.
[4] Chin S.L, Chen Y, Kosareva O, Kandidov V.P, and Théberge F, What is a Filament[J]. Laser Physics, 2008,18(8), 962–964.
[5] Braun A, Korn G, Liu X, et al. Self-channeling of high-peak-power femtosecond laser pulses in air[J]. Opt. Lett，1995, 20 (1):73–75.
[6] Peñano J R, Sprangle P, Serafim P, et al. Stimulated Raman scattering of intense laser pulses in air[J]. Phys. Rev. E, 2003, 68 (5), 056502.
[7] Kelley P L. Self-focusing of optical beams[J]. Phys. Rev. Lett, 1965, 15 (26):1005–1008.
[8] Perelomov A M, Popov V S, Terent’ev M V. Ionization of atoms in an alternating electric field[J]. Sov. Phys. JETP, 1966, 23 (5): 924–934.
[9] Ammosov M V, Delone N B, Krainov V P.Tunnel ionization of complex atoms and of atomic ions in an alternating electromagnetic field[J]. Sov. Phys. JETP, 1986, 64 (6): 1191–1194.
[10] Sprangle P, Esarey E, Hafizi B. intense laser pulse propagation and stability in partially stripped plasmas[J]. Phys. Rev. Lett, 1997, 79(6):1046–1049.
[11] Mlejnek M, Wright E M, Moloney J V. Dynamic spatial replenishment of femtosecond pulses propagating in air[J]. Opt. Lett, 1998, 23 (5):382–384.
[12] Feng Q, Moloney J V, Newell A C, et al. Theory andsimulation on the threshold of water breakdown induced by focused ultrashort laser pulses. IEEE J. Quant. Electron, 1997, 33 (2):127–137.
[13] Aközbek N, Bowden C M, Talebpour A, et al. Femtosecond pulse propagation in air: variational analysis. Phys. Rev. E, 2000, 61 (4):4540–4549.
[14] Duan Z L,Chen J P,Fang Z B, et al. Envolvement of filamentation of femtosecond laser pulses of a kHz repletion rate propagating in air[J]. Acta Physica Sinica, 2004, 53 (02):473-477 (in chinese).
[15] Méchain G,Olivier T, Franco M, et al. Femtosecond filamentation in air at low pressures: Part II: Laboratory experiments[J]. Opt. Commun, 2006, 261:322–326.