Laser oscillation in Yb:YAG waveguide beam-splitters with variable splitting ratio

被引：36

作者：

Calmano, Thomas ^{[1
,2
]}

Kraenkel, Christian ^{[1
,2
]}

Huber, Guenter ^{[1
,2
]}

机构：

[1] Univ Hamburg, Inst Laser Phys, D-22761 Hamburg, Germany

[2] Hamburg Ctr Ultrafast Imaging, D-22761 Hamburg, Germany

来源：

OPTICS LETTERS | 2015年 / 40卷 / 08期

关键词：

EFFICIENCY; WRITTEN;

D O I：

10.1364/OL.40.001753

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this Letter, we report on laser emission from Yb:YAG beam-splitters fabricated by direct femtosecond-laser inscription. These devices consist of two adjacent mirrored s-curved waveguides merged into a section allowing for multi-mode interference (MMI) and a straight waveguide. Nine-millimeter-long one-to-two beam-splitters with radii of curvature between 10 and 80 mm have been fabricated resulting in separations between the two arms of up to 0.65 mm. Due to the MMI-section, the splitting ratio was variable by slightly changing the incoupling conditions. Maximum laser output powers of 2.29 W and slope efficiencies of 52% were achieved with the best beam-splitter waveguide laser. For all radii of curvature exceeding 10 mm, similar efficiencies were demonstrated. (C) 2015 Optical Society of America

引用

页码：1753 / 1756

页数：4

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