Delivery of 10-MW Nd:YAG laser pulses by large-core optical fibers: Dependence of the laser-intensity profile on beam propagation

被引：37

作者：

Richou, B ^{[1
]}

Schertz, I ^{[1
]}

Gobin, I ^{[1
]}

Richou, J ^{[1
]}

机构：

[1] CEA,F-77181 COURTRY,FRANCE

来源：

APPLIED OPTICS | 1997年 / 36卷 / 07期

关键词：

Nd:YAG beam delivery; laser beam profile; 15-ns pulses; multimode fiber optics; laser-induced damage threshold;

D O I：

10.1364/AO.36.001610

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A large-core multimode optical fiber of a few meters length is studied as a 10-MW beam delivery system for a 15-ns pulsed Nd:YAG laser. A laser-to-fiber vacuum coupler is used to inhibit air breakdown and reduce the probability of dielectric breakdown on the fiber front surface. Laser-induced damage inside the fiber core is observed behind the fiber front surface. An explanation based on a high power density is illustrated by a ray trace. Damaged spots and measurements of fiber output energies are reported for two laser beam distributions: a flat-hat type and a near-Gaussian type. Experiments have been performed to deliver a 100-pulse mean energy between 100 and 230 mJ without catastrophic damage. (C) 1997 Optical Society of America.

引用

页码：1610 / 1614

页数：5