Monolithic fiber end cap collimator for high-power free-space fiber-fiber coupling

被引：15
作者：
Zhou, Xuanfeng [1 ]
Chen, Zilun [1 ]
Wang, Zefeng [1 ]
Hou, Jing [1 ]
机构：
[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China
来源：
APPLIED OPTICS | 2016年 / 55卷 / 15期
基金：
中国国家自然科学基金;
关键词：
SPOT-SIZE; LASERS; MODES; LIGHT;
D O I：
10.1364/AO.55.004001
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, we present the design, construction, and testing of a monolithic fiber end cap collimator for high-power free-space fiber-fiber coupling applications. The collimator is based on a large-sized fiber end cap and a spherical lens design on the output facet. Values of the spot size and working distance are theoretically analyzed based on Gaussian approximation and ABCD transmission matrix. The free-space fiber-fiber coupling process is also analyzed for different lens curvature radii and coupling distances. In the experiment, a collimated laser beam is obtained with Rayleigh length of about 400 mm. A high-power laser with 1.1 kW output is tested on the end cap collimator, which only heats up by 7 degrees C at the output facet without active cooling. Free-space fiber-fiber coupling between two 20/400 mu m fibers is achieved based on these collimators, with measured coupling loss lower than 0.3 dB. (C) 2016 Optical Society of America
引用
收藏
页码：4001 / 4004
页数：4
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