Third-harmonic generation in a laser-pre-excited gas: the role of excited-state neutrals

被引：50
作者：
Fedotov, AB
Naumov, AN
Silin, VP
Uryupin, SA
Zheltikov, AM [1 ]
Tarasevitch, AP
von der Linde, D
机构：
[1] Moscow MV Lomonosov State Univ, Fac Phys, Ctr Int Laser, Moscow 119899, Russia
[2] Russian Acad Sci, PN Lebedev Phys Inst, Moscow 117924, Russia
[3] Univ Essen Gesamthsch, Inst Laser & Plasmaphys, D-45117 Essen, Germany
来源：
PHYSICS LETTERS A | 2000年 / 271卷 / 5-6期
基金：
俄罗斯基础研究基金会;
关键词：
harmonic generation; high-power laser pulses;
D O I：
10.1016/S0375-9601(00)00390-X
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The generation of the third harmonic of 150-fs 4-mJ Ti:sapphire laser pulses in the atmospheric air preliminary excited by 15-ns 100-mJ pulses of the second harmonic of a Nd:YAG laser is investigated. Preliminary laser excitation of a gas is shown to considerably increase the efficiency of frequency tripling of femtosecond pulses. Characteristic times corresponding to the maximum intensity of third-harmonic generation are shown to substantially exceed the characteristic plasma decay times, indicating the important role of excited-state neutrals in the enhancement of THG efficiency. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：407 / 412
页数：6
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