Red, green, and blue edge-emitting devices for beam scanning light engine architectures: from single emitters to arrays

M. Rossetti; A. Castiglia; M. Malinverni; A. Ferhatovic; D. Martin; M. Duelk; C. Vélez

doi:10.1117/12.3000076

12 March 2024 Red, green, and blue edge-emitting devices for beam scanning light engine architectures: from single emitters to arrays

M. Rossetti, A. Castiglia, M. Malinverni, A. Ferhatovic, D. Martin, M. Duelk, C. Vélez

Author Affiliations +

Proceedings Volume 12913, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) V; 129130S (2024) https://doi.org/10.1117/12.3000076
Event: SPIE AR | VR | MR, 2024, San Francisco, California, United States

Abstract

Laser beam scanners are of strong interest, as they offer a compact and low-power consumption solution for head-worn AR-displays and, more in general, for efficient and focus-free projection displays. In this framework, EXALOS has been leading the research and development of active light sources, focusing on optimizing red, green, and blue edge-emitting devices, including superluminescent diodes (SLEDs) and laser diodes (LDs). This work provides an overview of the performance achieved by single-emitter SLEDs and low-threshold LDs based on GaN, as well as AlGaInP, III-V semiconductors. Furthermore, we report on the development of emitter arrays. In particular, narrow-pitch devices with an emitter-to-emitter spacing of 10 μm and also a novel device design featuring both anodes and cathodes on the top chip surface are reported. The individual cathodes are fully independent and electrically insulated, ensuring an emitter-to-emitter resistance close to 1MOhm. Compared to conventional arrays with common cathode, the new architecture allows for integration with industry-standard current-sink drivers for efficient multi-LD modulation.

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M. Rossetti, A. Castiglia, M. Malinverni, A. Ferhatovic, D. Martin, M. Duelk, and C. Vélez "Red, green, and blue edge-emitting devices for beam scanning light engine architectures: from single emitters to arrays", Proc. SPIE 12913, Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) V, 129130S (12 March 2024); https://doi.org/10.1117/12.3000076

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