Single transverse mode GaSb-based ridge waveguide lasers with low lateral beam divergence

Tian-fang Wang; Cheng-ao Yang; Yi-hang Chen; Jian-mei Shi; Hong-guang Yu; Xiang-bin Su; Yu Zhang; Ying-qiang Xu; Hai-qiao Ni; Zhi-chuan Niu

doi:10.1117/12.2643841

27 December 2022 Single transverse mode GaSb-based ridge waveguide lasers with low lateral beam divergence

Tian-fang Wang, Cheng-ao Yang, Yi-hang Chen, Jian-mei Shi, Hong-guang Yu, Xiang-bin Su, Yu Zhang, Ying-qiang Xu, Hai-qiao Ni, Zhi-chuan Niu

Author Affiliations +

Proceedings Volume 12311, Semiconductor Lasers and Applications XII; 123110V (2022) https://doi.org/10.1117/12.2643841
Event: SPIE/COS Photonics Asia, 2022, Online Only

Abstract

GaSb-based narrow Ridge Waveguide (RW) laser diodes providing high optical power with low lateral beam divergence single-transverse-mode operation are fabricated and characterized. The typical Separate-Confinement-Heterostructure (SCH) Multi-Quantum-Well (MQW) structure is grown by the solid-state Molecular Beam Epitaxy (MBE). The 1 mm long uncoated RW lasers yield single-transverse-mode output power exceeding 170 mW in the 1950 nm wavelength range under continuous-wave (cw) operation at an injection current of 800 mA and room temperature of 20 ℃. The shallow-etched 7 μm width RW design produces a lateral beam divergence angle as narrow as 9° Full Width at Half Maximum (FWHM) with an excellent beam quality of M²factor < 2 at the maximum output power, enabling it for simple and inexpensive bulk coupling into the typical SM1950 or PM1950 fiber which has a core diameter of 7 μm and numerical aperture (NA) of 0.2. The RW lasers with high output power, good beam quality, and low divergence are promising candidates for a wide range of demanding and advanced applications including pumping fiber amplifiers and solid-state lasers, seeding external cavity lasers, and frequency conversion.

Citation Download Citation

Tian-fang Wang, Cheng-ao Yang, Yi-hang Chen, Jian-mei Shi, Hong-guang Yu, Xiang-bin Su, Yu Zhang, Ying-qiang Xu, Hai-qiao Ni, and Zhi-chuan Niu "Single transverse mode GaSb-based ridge waveguide lasers with low lateral beam divergence", Proc. SPIE 12311, Semiconductor Lasers and Applications XII, 123110V (27 December 2022); https://doi.org/10.1117/12.2643841

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