大功率激光功率测量常用量热法,但溯源复杂.介绍了具有较高测量精度的基于光压原理的大功率激光功率测量方法,设计了利用1/105精度天平大功率激光测量实验,测试了基于GaAs半导体材料制作的反射镜的反射率及损伤阈值,确定了基于GaAs半导体材料反射镜的相关性能.得到了普通实验室条件下的功率测量重复性及线性,验证了1/105精度天平用于大功率激光测量的可行性.通过实验结果结合理论计算,得出利用1/105精度天平的光压测量功率的测量上限可以达到3×104?W以上.

Junction temperatures and spectral characteristics of InGaN+YAG white LEDs were measured at various driving currents and a constant environmental temperature,and the spectral curve under different junction temperatures was obtained,which indicated the dependence of InGaN+YAG white LEDs spectral characteristics on junction temperature.The experiment results show that the line width of blue spectrum is dependent on junction temperature,while the one of phosphor spectrum exhibits a weak dependence;the peak wavelengths of blue and phosphor spectrum have no dependence on junction temperature,while the peak intensity ratio of phosphor to blue spectrum has a good linearity.

The spetrum distribution of second harmonic waves genearaed in nonlinear crystals is studied.An aplication of phase extraction and Fourier transform is described.

In this paper we describe an effective approach for obtaining the pulse temporal profile of ultra short laser pulses from a t raditional autocorrelation measurement.The extraction of the pulse shape does no t depend on additional spectral measurement or assumptions,which classify a form for the pulse.

从理论上分析光源的光谱宽度对滤光片测量结果的影响,给出光源光谱曲线及滤光片透过率曲线为正态分布时测得的滤光片光谱分布曲线.

本文介绍几种短、超短激光脉冲的测试方法.