纳秒级脉冲型群红外量子级联激光器驱动电源  

Nanosecond driver for multiple pulse-modulated Infrared quantum cascade lasers

作　　者：党敬民[1] 翟冰[1] 高宗丽[1] 陈晨[2] 王一丁[1] 

机构地区：[1]吉林大学电子科学与工程学院集成光电子学国家重点联合实验室,吉林长春130012 [2]吉林大学仪器科学与电气工程学院,吉林长春130026

出　　处：《光学精密工程》2013年第9期2209-2216,共8页Optics and Precision Engineering

基　　金：国家863高技术研究发展计划资助项目(No.2007AA06Z112;No.2007AA03Z446;No.2009AA03Z442);吉林省科技厅资助项目(No.20090422)

摘　　要：由于红外混合气体的检测方法要求电源具有驱动群红外量子级联激光器(QCL)的能力,本文设计并研制了一种新型群QCL驱动电源。为了避免驱动电流多路输出的交叉影响,该电源采用了时分复用控制方案,并结合高速模拟比例-积分(PI)反馈,实现了每一条输出支路电流的独立调节。系统采用脉冲频率调制(PFM)与脉冲宽度调制(PWM)相结合的方法,改善了驱动脉冲的频率及脉宽特性,确保了各支路激光器均工作在最佳状态。利用该驱动电源对中国科学院半导体所研制的中心波长分别为4.8,7.49,7.71和10.7μm的4种QCL进行了驱动测试。结果表明:在长时间(220h)运行中,系统驱动电流长期稳定度为4.62×10-6,线性度为0.029 1%,满足驱动群量子级联激光器的要求,为红外混合气体的检测提供了可靠的保障。A driving generator to drive multiple infrared Quantum Cascade Lasers （QCLs） was de- signed under an experimental validation for detection of mixed infrared gases. To avoid the cross-in- fluence of the driving currents among multi-channels, the Time Division Multiplexing （TDM） method integrating with the fast analog proportional-integral （PI） control theory was used to adjust the regu- lating output currents in each branch independently. A control method combined pulse frequency mod- ulation （PFM） and Pulse Width Modulation （PWM） was proposed to improve the characteristics of the operating frequency and the pulse width of driving pulse and to guarantee the lasers of each branch to operate in an optimum condition. By utilizing the illustrated driver, a driving test was performed on four QCLs with center wavelengths at 4.8, 7.49, 7.71 and 10.7 μm respectively fabricated by Institu- te of Semiconductor, Chinese Academy of Sciences. Experimental results demonstrate that the stabili-ty of driving current is 4.62× 10-6 and the linearity of power system is O. 029 1 %during a long-term operation （220 h）, which meets the requirements of driving multiple QCLs and provide~ a strong guarantee for mixed infrared gas detection.

关 键 词：红外混合气体检测 群红外量子级联激光器（QCL） 驱动电源 时分复用（TDM） 

分 类 号：TN245[电子电信—物理电子学]