High reliability of 1550nm triple junction laser diode for long-range automotive LiDAR

Sidi Aboujja; Seth Pappas; Daniel Chu

doi:10.1117/12.2649168

14 March 2023 High reliability of 1550nm triple junction laser diode for long-range automotive LiDAR

Sidi Aboujja, Seth Pappas, Daniel Chu

Proceedings Volume 12403, High-Power Diode Laser Technology XXI; 1240308 (2023) https://doi.org/10.1117/12.2649168
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

We have developed the world-leading Triple Junction laser diode based on AlInGaAs/InP material systems for LiDAR applications. The monolithic laser structure with tunnel junction layers is designed to reduce the stress and improve the heat dissipation. It has 3x the output power and 2x the wall plug efficiency of a single junction laser due to its low operating voltage and high slope efficiency at 1W/A. A single Triple Junction laser diode at eye-safe 1550nm allows a LiDAR to achieve over 200m detection range in all-weather conditions. It can drastically improve and simplify the LiDAR design compared to other laser choices such as 905nm or fiber lasers. For mass adoption by the automotive industry here we demonstrate the high reliability required for Triple Junction high power laser diodes at 1550nm. The life test was performed on 95um aperture Triple Junction with 2.5mm cavity length in a TO9 package. They were driven at an average power of 700mW with the pulse width of 100 micro-seconds and 10% duty cycle at 90°C. Such stressed electrical and temperature condition is almost 20 times higher than standard operation for automotive LiDAR. We have accumulated for more than 1000 hours of life test on 30 devices. Based on Chi squared distribution analysis and Arrhenius equation the estimated MTTF (mean time to failure) is 248k hours at 20°C and 57k hours at 50°C operating temperature, which is respectively 31x and 7 more than the required 8k hours in automotive applications. We also tested Triple Junction laser diodes up to 100°C without performance degradation and without COD (catastrophic optical damage).

Conference Presentation

Citation Download Citation

Sidi Aboujja, Seth Pappas, and Daniel Chu "High reliability of 1550nm triple junction laser diode for long-range automotive LiDAR", Proc. SPIE 12403, High-Power Diode Laser Technology XXI, 1240308 (14 March 2023); https://doi.org/10.1117/12.2649168

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