Chen Weiwei, Liu Hongxu, Song De
Jilin Key Laboratory of Solid-State Laser Technology and Application, School of Science, Changchun, 130022, Jilin, China.
Sci Rep. 2025 Jan 3;15(1):656. doi: 10.1038/s41598-024-84875-2.
The response mechanism of a Four-Quadrant Photodetector (QPD) in an experimental setting was studied by irradiating a single QPD cell with a millisecond-pulsed laser. The response signal of the irradiated QPD cell varied with energy flux, pulse width, and applied bias, and comprised four main stages: an initial stage, decreasing barrier stage, holding stage, and recovery stage. Not only was the response signal of the irradiated cell affected by laser irradiation, but also the responses of the other three cells. This response in non-irradiated cells is mainly related to the common region structure, electric field, carrier generation and recombination in the QPD. The performance of each cell in the QPD can be distinguished, due to the differences in response signals between the irradiated cell and the other three. The research results have good application prospects in the fields of laser guidance and atomic force microscopy.
通过用毫秒脉冲激光照射单个象限光电探测器（QPD）单元，研究了实验环境中QPD的响应机制。被照射的QPD单元的响应信号随能量通量、脉冲宽度和施加偏压而变化，包括四个主要阶段：初始阶段、势垒降低阶段、保持阶段和恢复阶段。不仅被照射单元的响应信号受激光照射影响，其他三个单元的响应也受影响。未照射单元中的这种响应主要与QPD中的公共区域结构、电场、载流子产生和复合有关。由于被照射单元与其他三个单元之间响应信号的差异，可以区分QPD中每个单元的性能。研究结果在激光制导和原子力显微镜领域具有良好的应用前景。
