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Wavelength stabilized high pulse power 48 emitter laser bars for automotive LiDAR application
Semiconductor Science and Technology ( IF 1.9 ) Pub Date : 2020-05-22 , DOI: 10.1088/1361-6641/ab8397
Andreas Klehr , Armin Liero , Heike Christopher , Hans Wenzel , Andre Maaßdorf , Pietro Della Casa , Jörg Fricke , Arnim Ginolas , Andrea Knigge

Diode lasers generating optical pulses with high peak power and lengths in the nanosecond range are key components for LiDAR (Light Detection and Ranging) systems, e.g., for autonomous driving and object detection. We present here an internally wavelength stabilized distributed Bragg reflector (DBR) broad area (BA) laser bar with 48 emitters. The vertical structure based on AlGaAs (confinement and cladding layers) and InGaAs (active quantum well) is specifically optimized for wavelength-stabilized pulsed operation applying a surface Bragg grating with high reflectivity. The bar is electrically driven by a new in-house developed high-speed driver based on GaN transistors providing current pulses with amplitudes of up to 1000 A and a repetition 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 with a centre wavelength of about 900 nm has a width of 0.15 nm (FWHM) with a side mode suppression ratio > 30 dB.

中文翻译:

用于汽车 LiDAR 应用的波长稳定高脉冲功率 48 个发射器激光棒

二极管激光器产生的光脉冲具有高峰值功率和纳秒范围内的长度,是 LiDAR(光检测和测距)系统的关键组件,例如用于自动驾驶和物体检测。我们在此展示了一种具有 48 个发射器的内部波长稳定分布式布拉格反射器 (DBR) 广域 (BA) 激光棒。基于 AlGaAs(限制和包覆层)和 InGaAs(有源量子阱)的垂直结构专门针对应用具有高反射率的表面布拉格光栅的波长稳定脉冲操作进行了优化。该条由基于 GaN 晶体管的全新内部开发高速驱动器进行电气驱动,可提供幅度高达 1000 A 和重复频率为 10 kHz 的电流脉冲。生成的 4 ns 至 10 ns 长光脉冲几乎呈矩形,在 25°C 时达到超过 600 瓦的脉冲峰值功率。中心波长约为 900 nm 的光谱宽度为 0.15 nm (FWHM),边模抑制比 > 30 dB。
更新日期:2020-05-22
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