原子磁力仪系统高增益平衡光电探测器的设计  

Design of a high gain balanced photoelectric detecor for atomic magnetometer system

作　　者：张鹏[1,2,3] 陈洪娟[1,2] 桂永雷 孙立凯[3] ZHANG Peng CHEN Hong-juan GUI Yong-lei SUN Li-kai(College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China The NO. 49th Research Institute of China Electronics Technology Group Corporation, Harbin 150001, China)

机构地区：[1]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001 [2]哈尔滨工程大学水声技术重点实验室,黑龙江哈尔滨150001 [3]中国电子科技集团公司第四十九研究所,黑龙江哈尔滨150001

出　　处：《激光与红外》2017年第6期755-760,共6页Laser & Infrared

基　　金：国家863高新技术研究发展计划项目(No.2015AA8112005)资助

摘　　要：为了实现对原子磁力仪系统中微弱、发散、快速调制的光信号的精密检测,克服传统平衡探测器接光面积小、增益小、光电管间距不可调及与自由空间光信号探测不兼容等缺点,采用基于基尔霍夫定律的平衡差分放大法和基于平行轨道焊盘的精调方法,设计并制作了高增益平衡光电探测器,并介绍了其工作原理和结构组成。首先,针对光斑发散大和调制速率快的特点确定了具有10 mm×10 mm大接光面积的高速光电管;然后设计了双管中心间距从20~60 mm连续可调的平行轨道焊盘,增强其对各种光学系统的兼容性;最后,利用两级放大电路设计实现了高增益特性。实验结果表明,该探测器-3 dB带宽达到800 k Hz,信号跨阻增益达0.91 MΩ,在70 kHz时的信噪比为38.5 dB,能够满足原子磁力仪系统光信号检测的要求。In order to achieve precision detection of the weak, divergent and fast modulated optical signal in atomic magnetometer systems and overcome the disadvantages of traditional balanced detectors with small light-receiving areas, small gains, nonadjustable center distances between eachpair of photodiodes and incompatible with free space optical signal detection, anapproachbased on Kirchhoff＇s law of balanced differential amplification and a fine tuning methodbased on parallel tracks pads are adopted. Ahigh-gain balanced photodetectorisdesigned and produced, and the working principle and structure composition are introduced. First, for the features of large spot divergence and high modulation rate, a high-speed photodiode with a 10 mm x 10 mm large light-receiving area isdetermined;then a pair of parallel track padswhich enabledouble-diode center spaeeto be continuously adjusted from 20 mm to 60 mm isde- signed ,which enhancesthe compatibilitywith a variety of optical systems ; Finally, a two-stage amplifier circuit is de- signed to achieve the high gain characteristic. Experimental results show that the detector achieves a - 3 dB band- width of 800 kHz,a signal transimpedanee gain of 0. 91 Ml2,and a SNR of 38.5 dB@ 70 kHz. Therefore,this bal- anced photodetector fairly meets the needs of optical signal detection of atomic magnetometer systems.

关 键 词：平衡光电探测器 原子磁力仪 接光面积 高增益 信噪比 

分 类 号：TN247[电子电信—物理电子学]