Very compact multi-junction VCSEL arrays

Hemashilpa Kalagara; Guowei Zhao; Jun Yang; Benjamin Kesler; Mohammad Ali Shirazi; Mahdad Mansouree; Qianhuan Yu; Matthew Peters

doi:10.1117/12.2614461

28 March 2022 Very compact multi-junction VCSEL arrays

Hemashilpa Kalagara, Guowei Zhao, Jun Yang, Benjamin Kesler, Mohammad Ali Shirazi, Mahdad Mansouree, Qianhuan Yu, Matthew Peters

Author Affiliations +

Proceedings Volume 12020, Vertical-Cavity Surface-Emitting Lasers XXVI; 1202002 (2022) https://doi.org/10.1117/12.2614461
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Lumentum’s short pulse single-junction VCSEL arrays are currently being deployed in Time of Flight (ToF) sensors for short-range Light Detection and Ranging (LIDAR) applications in consumer electronics. However, single-junction VCSEL devices have a slope efficiency (SE) of only around 1.1 W/A making them unsuitable for longer range, higher power applications. With the rise of autonomous vehicle market, there is a need for ultra-short pulse, high peak power VCSELs for medium to long-range LIDAR systems. Multi-junction VCSELs are ideal candidates for this segment. The multi-junction VCSEL consists of stacked gain regions connected by highly doped tunnel junctions. An electron which radiatively recombines with a hole in one gain region, generating a photon, can then tunnel back into the conduction band via the highly doped region and is again available to generate another photon in the subsequent gain region, and so on. The total photons or output power scales with the number of junctions in the device. The optical power density and chip size are critical parameters of a LIDAR module. In this paper, we report the results of compact multi-junction arrays capable of delivering very high peak power.

Conference Presentation

Citation Download Citation

Hemashilpa Kalagara, Guowei Zhao, Jun Yang, Benjamin Kesler, Mohammad Ali Shirazi, Mahdad Mansouree, Qianhuan Yu, and Matthew Peters "Very compact multi-junction VCSEL arrays", Proc. SPIE 12020, Vertical-Cavity Surface-Emitting Lasers XXVI, 1202002 (28 March 2022); https://doi.org/10.1117/12.2614461

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