一种高稳定连续可调半导体激光器驱动源

摘要

In continuous variables coherent optical systems, the stability of semiconductor laser directly influences the test results. Injection current and working temperature are the main factors that affect the stability of semiconductor laser. Therefore the laser driver should be highly stable constant current source. Using current feedback control technology, the constant current source has the following advantages:goed constant current characteristics, small ripple, strong anti-interference capability ,etc. And the temperature control circuit is adopted to control the temperature of the laser,which can ensure the stability of output power. In addition, a series of protection electric circuit is adopted to ensure the reliable operation of the laser. In the system, the monolithic computer is adopted as the main controller. Using digital voltmeter as monitor,the driver has perfect protection function and is easy to use.%在连续变量相干光系统中,半导体激光器工作的稳定与否直接影响着检测结果.注入电流和工作温度是影响半导体激光器工作稳定的主要因素.因此激光器的驱动电源应是长时间、高稳定的恒流源,且带有恒温控制.采用电流串联负反馈技术,对控制量进行闭环控制,可实现高稳定和低纹波系数的驱动电流源,具有恒流特性好、纹波小、抗干扰能力强等优点.并采用自动温度控制电路对半导体激光器进行恒温控制,从而保证输出功率稳定,同时还采用了一系列的保护措施,实现半导体激光器的可靠运行.该系统采用单片机为主机,检测电路异常和控制保护电路,选择电压参数送入数字电压表显示,具有保护电路完善、操作直观的特点.