In-junction-plane beam divergence stabilization by lateral periodic structure in wide-stripe laser diodes

A. Malag, G. Sobczak, E. Dąbrowska, M. Teodorczyk
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Abstract

This paper describes the way to stabilize in-junction-plane optical field distribution and emitted beam divergence in high-power 970-nm-band laser diodes (LDs). This is done by introducing a lateral periodic structure into the LD‟s wide-stripe-waveguide, designed to prefer and stabilize the selected (resonant) high-order lateral mode. According to modeling, in CW operation the gain equalization of lateral modes due to thermal index guiding leads to beam divergence stabilization by incorporating the modes up to the resonant one and cutting out higher ones. This was demonstrated experimentally in a wide drive current range. Such stability of a non-Gaussian laser beam profile with steep slopes can be interesting for many applications. Thanks to the drive current flow control by the periodic structure, the effects typical for conventional wide-stripe LDs, such as lateral current crowding, carrier accumulation at stripe edges and optical far-field blooming are not observed.
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宽条纹激光二极管中横向周期结构的连接面光束发散稳定
本文介绍了稳定大功率970 nm波段激光二极管结面光场分布和发射光束散度的方法。这是通过在LD的宽条纹波导中引入横向周期结构来实现的,该结构旨在优选和稳定所选的(谐振)高阶横向模式。根据建模,在连续波工作中,由于热指数引导导致的横向模式的增益均衡通过合并谐振模式和切割更高的模式来实现光束发散稳定。在较宽的驱动电流范围内,实验证明了这一点。具有陡坡的非高斯激光束轮廓的这种稳定性对于许多应用来说是有趣的。由于采用周期结构控制驱动电流,传统宽条纹ld的横向电流拥挤、条纹边缘载流子积累和远场光晕等效应没有出现。
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来源期刊
AIMS Electronics and Electrical Engineering
AIMS Electronics and Electrical Engineering Engineering-Control and Systems Engineering
CiteScore
2.40
自引率
0.00%
发文量
19
审稿时长
8 weeks
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