Femtosecond laser processing of fiber Bragg gratings with photo-induced gradient-index assisted focusing

被引：8

作者：

Cui, Wei ^{[1
]}

Chen, Tao

Si, Jinhai

Chen, Feng

Hou, Xun

机构：

[1] Xi An Jiao Tong Univ, Sch Elect & Informat Engn, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Key Lab Phys Elect & Devices,Minist Educ, Xian 710049, Peoples R China

来源：

JOURNAL OF MICROMECHANICS AND MICROENGINEERING | 2014年 / 24卷 / 07期

基金：

中国国家自然科学基金;

关键词：

fiber Bragg gratings; femtosecond laser processing; gradient index; OPTICAL-FIBER; IR LASER;

D O I：

10.1088/0960-1317/24/7/075015

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Gradient-index modulation prefabrication in the cladding of standard telecom fibers was proposed for femtosecond laser processing of Type II-IR fiber Bragg gratings. The refractive index of the prefabricated region in the cladding had a large gradient across the laser beam, which could act as a cylindrical lens to enhance the focusing of laser beam when writing Type II-IR gratings. With the help of prefabrication, the threshold pulse energy for processing Type II-IR FBGs was lowered from 750 mu J to 520 mu J. The fabricated FBGs showed good thermal stability at temperatures over 900 degrees C.

引用

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