半导体激光器阈值电流测试方法研究

介绍了一种基于单片机和虚拟仪器技术的半导体激光器阈值电流的测量方法,以单片机为核心设计了半导体激光器的驱动电路以及驱动电流和光功率的的采集电路,并实现了与PC机的通信。利用虚拟仪器技术实现对单片机的控制、参数设定、数据处理和存储、PI曲线的显示以及阈值电流的求解。实验结果表明:利用两段直线拟合法求得的阈值电流最准确,重复测量时可靠性最好。

Research on the measurement of semiconductor laser threshold current

A system is developed to measuer the threshold current of semianductor laser.The system is based on Single Chip Microcomputer (SCM) and Virtual Instrument (VI) technology.Driver for semiconductor laser,control and sampling circuit were developed.With the VI technology,commuiction between test unit and process and control unit (PC) is realized.PC is used to set up the test current,process the measured data sent by the SCM.Three kinds of processing method were programed and tested.Results show that the bi-linear fit method has the most accuracy and the best stability to determine the threshold curent.