Long distance filamentation of 400 nm femtosecond laser pulses in air

被引：11

作者：

Zhang, Z. ^{[1
]}

Lu, X. ^{[1
]}

Xi, T. -T. ^{[1
]}

Liang, W. -X. ^{[1
]}

Hao, Z. -Q. ^{[1
]}

Zhang, Y. ^{[1
]}

Zhou, M. -L. ^{[1
]}

Wang, Z. -H. ^{[1
]}

Zhang, J. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2009年 / 97卷 / 01期

基金：

中国国家自然科学基金;

关键词：

TRANSPARENT MEDIA; PROPAGATION; GENERATION; LIGHT; COMPRESSION; PHYSICS; ARGON; KTP;

D O I：

10.1007/s00340-009-3663-0

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The characteristics of the light filaments formed by lambda=400 nm blue femtosecond laser pulses are experimentally investigated. Both pre-focused and free propagation conditions are studied. The diameter, length and electron density were measured by using fluorescence signal imaging and longitudinal diffraction method. About 2x10(17) cm(-3) electron density in filaments was achieved with beam pre-focusing. In the free propagation case, the multi-filamentation can be observed over 70 m propagation distance, and the energy in the filament core is only about 30 mu J. The effects of energy reservoir on the filament core have been investigated by inserting a diaphragm in a selected single filament path to block the energy of the reservoir. The evolution of filamentation has been studied experimentally as a function of diaphragm size. The energy reservoir can be extended to about 10 mm from the filament core. The results indicate that the up conversion of laser is a possible way to enhance the utilization of laser energy for the generation of long filaments.

引用

页码：207 / 213

页数：7

共 31 条

[1] Portable ultrafast blue light sources designed with frequency doubling in KTP and KNbO3 [J].