研究目的
Investigating the development of wavelength stabilized high pulse power 48 emitter laser bars for automotive LiDAR application.
研究成果
DBR BA laser bars with internal wavelength stabilisation were realized, capable of generating optical pulses with high peak power and narrow spectral width. The presented properties enable their use in automotive line scanning LiDAR systems, despite the challenges of electrical power losses and inhomogeneous current distribution.
研究不足
The conversion efficiency of the complete pulse driver module is low (1.2%), resulting in significant electrical power losses and heating of the assembly. The output power depends on the position of the emitter on the bar, indicating an inhomogeneous current distribution.
1：Experimental Design and Method Selection:
The design of layer structure and Bragg grating of the laser bar is optimized for wavelength-stabilized pulsed operation. A surface Bragg grating with high reflectivity is applied. The bar is electrically driven by a high-speed driver based on GaN transistors.
2：Sample Selection and Data Sources:
A DBR BA laser bar with 48 emitters is used. The vertical structure is based on AlGaAs and InGaAs.
3：List of Experimental Equipment and Materials:
High-speed electrical pulse driver based on GaN transistors, DBR BA laser bar, optical spectrum analyser, streak camera, temperature controller, and water cooled heat sink.
4：Experimental Procedures and Operational Workflow:
The laser bar is characterized for its power-current characteristics, temporal behaviour of the generated optical pulses, and spectral behaviour under different injection conditions.
5：Data Analysis Methods:
The optical pulse power and pulse current are calculated from the measured average optical power and average current. The temporal shape of the optical pulses is analyzed using a streak camera.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
