Author(s): Wang, L (Wang, Liang); Qi, AY (Qi, Aiyi); Zhou, XY (Zhou, Xuyan); Fu, T (Fu, Ting); Xu, CW (Xu, Chuanwang); Han, RB (Han, Renbo); Qu, HW (Qu, Hongwei); Zheng, WH (Zheng, Wanhua)

Source: IEEE PHOTONICS JOURNAL Volume: 14 Issue: 4 Article Number: 1544306 DOI: 10.1109/JPHOT.2022.3192929 Published: AUG 2022

Abstract: 9xx nm laser diodes (LDs) with aluminum component continuous gradient photonic band crystal (CCG-PBC) waveguide structure are designed and fabricated. The simulation results indicate that the CCG-PBC structure can significantly reduce the heterojunction barrier and carrier accumulation at the interface of the conventional PBC structure. We demonstrate that the LD with CCG-PBC structure can achieve a narrow vertical divergence angle of 16.2 degrees at full width at half maximum, and the divergence angle changes with current not more than 0.5 degrees. Meanwhile, the power conversion efficiency (PCE) of the narrow divergence angle LD can reach 66.7%, and the PCE at 20 W is still over 60%. After optimizing the coating reflectivity and cavity length of the CCG-PBC structure LD, the peak PCE and power are 71.5% and 17.2 W at 25 degrees C and 77.7% and 23.3 W at 0 degrees C, respectively, which are optimal results for any edge-emitting LD. Our device provides valuable guidance for researching high power and high efficiency narrow vertical divergence angle LDs.

Accession Number: WOS:000838675800005

ISSN: 1943-0655

eISSN: 1943-0647

Full Text: https://ieeexplore.ieee.org/document/9834953/