摘要
光束质量是评价高能激光系统指标的重要参数,准确测量激光功率密度时空分布是获取激光光束质量、验证改进激光系统设计及实际应用的重要依据。介绍了一种采用光电探测器阵列实现近红外波段高能激光束功率密度时空分布的测量方法,可实现波长范围为0.9-1.7μm、功率密度为mW/cm^2-kW/cm^2量级的激光光斑参数测量,并具有探测光斑面积大和测量不确定度小等特点。给出了系统的标定结果,在弱光标定情况下,测量值与激光器输出功率标称值偏差在3%以内。该方法可以作为近红外激光束功率密度时空分布测量的有效手段。
Beam quality is one of the critical characters for evaluation of high energy laser system.Accurately measuring the spatio-temporal distribution of laser power density is an important basis to obtain beam quality and improve design of high energy laser system.A method adopting detector array was introduced for measuring power density spatio-temporal distribution of near infrared high energy laser.The system was capable for absolutely measuring power density distribution of near infrared laser with response wavelength between 0.9 μm and 1.7 μm,the dynamic range of power density from scale of mW/cm^2 to kW/cm^2,and characterized by its capability of large detecting area and little uncertainty in power measurement.The calibration procedure and some nominal results were also given,along with the nominal deviation between measuring value and output power within 3% for low power laser.It can be one of effective ways to measure power density spatio-temporal distribution of near infrared high energy laser.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第5期935-938,共4页
Infrared and Laser Engineering
基金
国防预研基金
关键词
高能激光
时空分布
探测器阵列
激光功率密度
光束质量
high energy laser
spatio-temporal distribution
detector array
laser power density
beam quality
