High spectral purity GaSb-based blazed grating external cavity laser with tunable single-mode operation around 1940nm

被引：7

作者：

Wang, Tianfang ^{[1
,2
]}

Yang, Chengao ^{[1
,2
]}

Zhang, Yi ^{[1
,2
]}

Chen, Yihang ^{[1
,2
]}

Shang, Jinming ^{[1
,2
]}

Zhang, Yu ^{[1
,2
]}

Xu, Yingqiang ^{[1
,2
]}

Niu, Zhichuan ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

来源：

OPTICS EXPRESS | 2021年 / 29卷 / 21期

基金：

中国国家自然科学基金;

关键词：

DIODE-LASER; MU-M; SEMICONDUCTOR-LASERS;

D O I：

10.1364/OE.439255

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this article, we present a tunable GaSb-based blazed grating external cavity laser (BG-ECL) with high spectral purity and high output power single-mode operation around 1940nm. The drastic increase in spectral selectivity and optical power results from the employment of a single-transverse-mode operating narrow ridge waveguide laser diode with an optimized AR coating on the front facet. The stable fundamental spatial mode output beam from the laser diode enables efficient collimation and high coupling efficiency with the blazed grating, leading to stronger wavelength-selective feedback. The AR coating with proper low reflectivity on the straight waveguide effectively suppresses the internal cavity mode lasing without causing extra optical loss. As a result, the BG-ECL device exhibits excellent comprehensive performance with a side mode suppression ratio (SMSR) over 50dB with optical power exceeding 30 mW within a 70 nm tuning range. A maximum SMSR of 56.26 dB with 35.12 mW output power was observed in continuous-wave operation. By increasing the working temperature of the diode laser, the tuning range can be further extended to over 100 nm without noticeable degradation in spectral and output power performance. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：33864 / 33873

页数：10

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