摘要
光束质量是评价高能激光系统综合指标的重要参数,准确测量激光远场功率密度的时空分布是获取其光束质量和研究高能激光大气传输效应的有效手段之一。采用室温中红外光电探测器阵列,研制了可用于中红外激光远场光斑测量的光电阵列靶斑仪系统,系统主要由光学衰减单元、光电探测器阵列、信号调理单元、数据采集系统、无线数传单元、数据处理单元等组成。为解决中红外光电探测器响应率随温度变化敏感的难题,提出了基于探测器元阻抗的响应率自适应实时校正模型,拓展了测量系统的工作温度。该系统可测激光波长为1～5μm,空间分辨率为2.5cm,数据刷新频率为25 Hz,测量动态范围为1000倍,工作温度为-60～40℃,测量不确定度小于20%。
Beam quality and intensity are critical characters of high energy laser system. Accurately measuring the far-field laser beam spatial profile is an effective way to diagnose laser beam quality and study the atmospheric transmission effects for a high energy laser system In this paper, a detector array system for mid-infrared laser beam profile measuring is developed. The system is consisted of optic attenuators, photoconductive HgCdTe detectors, amplifiers, analog to digital converter unit, wireless transmission unit, and data processing end. Considering the responsivity and resistance sensitivity of HgCdTe detector with temperature, a responsivity adaptive calibration model is proposed to solve the temperature sensitivity of HgCdTe detector. The system is capable for absolutely measuring far-field power density distribution of infrared laser with response wavelength between 1 μm and 5 μm, the dynamic range of power density which it can measure of above 10^3 , the refresh rate of 25 Hz, along with the measurement uncertainty of less than 20% in the temperature range of -60-40 ℃.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第2期521-525,共5页
Chinese Journal of Lasers
基金
国防预研基金(22110501)资助项目
关键词
测量
中红外激光
功率密度时空分布
靶斑仪
响应率自适应校正模型
碲镉汞探测器
measurement
mid-infrared laser
power density spatial-time distribution
detector array
responsivity adaptive calibration model
photoconductive HgCdTe detector
