Measurements of fluence profiles in femtosecond laser filaments in air

被引：35

作者：

Liu, Xiao-Long ^{[1
,2
]}

Cheng, Weibo ^{[1
]}

Petrarca, Massimo ^{[3
]}

Polynkin, Pavel ^{[1
]}

机构：

[1] Univ Arizona, Coll Opt Sci, 1630 East Univ Blvd, Tucson, AZ 85721 USA

[2] Chinese Acad Sci, Acad Optoelect, Beijing 100094, Peoples R China

[3] Univ Roma La Sapienza, SBAI Dept, Via A Scarpa 14, I-00161 Rome, Italy

来源：

OPTICS LETTERS | 2016年 / 41卷 / 20期

基金：

中国国家自然科学基金;

关键词：

TRANSPARENT MEDIA; INTENSITY; ABLATION; PULSES; LIGHT;

D O I：

10.1364/OL.41.004751

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We introduce a technique to measure fluence distributions in femtosecond laser beams with peak intensity of up to several hundred terawatts per square centimeter. Our approach is based on the dependence of single-shot laser ablation threshold for gold on the angle of incidence of the laser beam on the gold sample. We apply this technique to the profiling of fluence distributions in femtosecond laser filaments at a wavelength of 800 nm in air. The peak intensity is found to be clamped at a level that depends on the external beam focusing. The limiting value of the peak intensity attainable in long-range 800 nm air filaments, under very loose focusing conditions (f-number above similar to 500), is about 55 TW/cm(2). (C) 2016 Optical Society of America

引用

页码：4751 / 4754

页数：4

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