Edge-emitting blue laser diode with high CW wall-plug efficiency of 50 %

Yoshitaka Nakatsu; Yoji Nagao; Tsuyoshi Hirao; Kazuma Kozuru; Tatsuya Kanazawa; Shingo Masui; Eiichiro Okahisa; Tomoya Yanamoto; Shin-ichi Nagahama

doi:10.1117/12.2601154

5 March 2022 Edge-emitting blue laser diode with high CW wall-plug efficiency of 50 %

Yoshitaka Nakatsu, Yoji Nagao, Tsuyoshi Hirao, Kazuma Kozuru, Tatsuya Kanazawa, Shingo Masui, Eiichiro Okahisa, Tomoya Yanamoto, Shin-ichi Nagahama

Author Affiliations +

Proceedings Volume 12001, Gallium Nitride Materials and Devices XVII; 1200109 (2022) https://doi.org/10.1117/12.2601154
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

This paper reports the latest device performance of high-power blue laser diodes (LDs). The epitaxial structures of LDs were grown by metal organic chemical vapor deposition (MOCVD) on C-plane free-standing GaN substrates. And a ridge type structure was formed at the top of p-type layers. The ridge width of the LD was 45 μm. Electrodes of the n-type and p-type were formed at the substrate and the ridge respectively. And the front and rear sides were obtained by cleavage at the m-plane surface. These faces were covered by dielectric mirrors. Every LD chip was mounted on a heat sink using a junction down method in a TO-Φ9 mm package for suppressing thermal resistance. We optimized the epitaxial and the device structures for high efficiency and high optical output power. A New developed 455 nm blue LD showed the optical output power and the voltage of 5.73 W and 3.82 V at the forward current of 3 A under Continuous Wave (CW) operation. The wall-plug efficiency (WPE) of the 455 nm blue LD was 50.0 % at 3 A. This is the highest WPE reported so far. The peak WPE of the 455 nm LD was 51.2 % at the forward current of 2 A.

Conference Presentation

Citation Download Citation

Yoshitaka Nakatsu, Yoji Nagao, Tsuyoshi Hirao, Kazuma Kozuru, Tatsuya Kanazawa, Shingo Masui, Eiichiro Okahisa, Tomoya Yanamoto, and Shin-ichi Nagahama "Edge-emitting blue laser diode with high CW wall-plug efficiency of 50 %", Proc. SPIE 12001, Gallium Nitride Materials and Devices XVII, 1200109 (5 March 2022); https://doi.org/10.1117/12.2601154

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