The extreme nonlinear optics of gases and femtosecond optical filamentation

被引：26

作者：

Milchberg, H. M. ^{[1
]}

Chen, Y-H. ^{[1
]}

Cheng, Y-H. ^{[1
]}

Jhajj, N. ^{[1
]}

Palastro, J. P. ^{[1
]}

Rosenthal, E. W. ^{[1
]}

Varma, S. ^{[1
]}

Wahlstrand, J. K. ^{[1
]}

Zahedpour, S. ^{[1
]}

机构：

[1] Univ Maryland, Inst Res Elect & Appl Phys, College Pk, MD 20742 USA

来源：

PHYSICS OF PLASMAS | 2014年 / 21卷 / 10期

基金：

美国国家科学基金会;

关键词：

SINGLE-SHOT; LASER-PULSES; SELF-COMPRESSION; REFRACTIVE-INDEX; MU-M; AIR; EVOLUTION; PHASE; EMISSION; DYNAMICS;

D O I：

10.1063/1.4896722

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Under certain conditions, powerful ultrashort laser pulses can form greatly extended, propagating filaments of concentrated high intensity in gases, leaving behind a very long trail of plasma. Such filaments can be much longer than the longitudinal scale over which a laser beam typically diverges by diffraction, with possible applications ranging from laser-guided electrical discharges to high power laser propagation in the atmosphere. Understanding in detail the microscopic processes leading to filamentation requires ultrafast measurements of the strong field nonlinear response of gas phase atoms and molecules, including absolute measurements of nonlinear laser-induced polarization and high field ionization. Such measurements enable the assessment of filamentation models and make possible the design of experiments pursuing applications. In this paper, we review filamentation in gases and some applications, and discuss results from diagnostics developed at Maryland for ultrafast measurements of laser-gas interactions. (C) 2014 AIP Publishing LLC.

引用

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