COMD-free continuous-wave high-power laser diodes by using a multi-section waveguide method

Abdullah Demir; Kaveh Ebadi; Yuxian Liu; Ali Kaan Sünnetçioğlu; Sinan Gündoğdu; Serdar Şengül; Yuliang Zhao; Yu Lan; Guowen Yang

doi:10.1117/12.2650619

14 March 2023 COMD-free continuous-wave high-power laser diodes by using a multi-section waveguide method

Abdullah Demir, Kaveh Ebadi, Yuxian Liu, Ali Kaan Sünnetçioğlu, Sinan Gündoğdu, Serdar Şengül, Yuliang Zhao, Yu Lan, Guowen Yang

Author Affiliations +

Proceedings Volume 12403, High-Power Diode Laser Technology XXI; 124030D (2023) https://doi.org/10.1117/12.2650619
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Catastrophic optical mirror damage (COMD) limits the output power and reliability of laser diodes (LDs). The self-heating of the laser contributes to the facet temperature, but it has not been addressed so far. This study investigates a two-section waveguide method targeting significantly reduced facet temperatures. The LD waveguide is divided into two electrically isolated sections along the cavity: laser and passive waveguide. The laser section is pumped at high current levels to achieve laser output. The passive waveguide is biased at low injection currents to obtain a transparent waveguide with negligible heat generation. This design limits the thermal impact of the laser section on the facet, and a transparent waveguide allows lossless transport of the laser to the output facet. Fabricated GaAs-based LDs have waveguide dimensions of (5-mm) x (100-μm) with passive waveguide section lengths varied from 250 to 1500 μm. The lasers were operated continuous-wave up to the maximum achievable power of around 15 W. We demonstrated that the two-section waveguide method effectively separates the heat load of the laser from the facet and results in much lower facet temperatures (T_f). For instance, at 8 A of laser current, the standard laser has T_f = 90 °C, and a two-section laser with a 1500 μm long passive waveguide section has T_f = 60 °C. While traditional LDs show COMD failures, the multi-section waveguide LDs are COMD-free. Our technique and results provide a pathway for high-reliability LDs, which would find diverse applications in semiconductor lasers.

Conference Presentation

Citation Download Citation

Abdullah Demir, Kaveh Ebadi, Yuxian Liu, Ali Kaan Sünnetçioğlu, Sinan Gündoğdu, Serdar Şengül, Yuliang Zhao, Yu Lan, and Guowen Yang "COMD-free continuous-wave high-power laser diodes by using a multi-section waveguide method", Proc. SPIE 12403, High-Power Diode Laser Technology XXI, 124030D (14 March 2023); https://doi.org/10.1117/12.2650619

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