H. Wenzel, A. Klehr, A. Liero, H. Christopher, J. Fricke, A. Maaßdorf, A. Zeghuzi, and A. Knigge

Published in:

IEEE High Power Diode Lasers and Systems Conference (HPD 2019), Coventry, UK, Oct. 9-10, pp. 7-8, ISBN: 978-1-7281-3097-2 (2019).

Abstract:

Key components of LiDAR (Light Detection and Ranging) systems, e.g., for autonomous driving and robotics are diode lasers capable of generating nanoseconds-long optical pulses with peak powers of 100 W and more. We present here an internally wavelength stabilized distributed Bragg reflector (DBR) broad area (BA) laser bar with 48 emitters electrically driven by a new in-house developed high-speed driver based on GaN transistors providing electrical pulses with peak currents of up to 1000 A and a repitition frequency of 10 kHz. The generated 4 ns to 10 ns long optical pulses are nearly rectangular shaped and reach a pulse peak power in excess of 600 Watts at 25°C. The optical spectrum of a single emitter with a center wavelength of about 900 nm has a width of 0.6 nm with a side mode suppression ratio >30 dB.

Index Terms:

Bragg gratings, diode lasers, electronic circuits, laser radar, pulse generation, quantum well lasers.

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