【摘要】 用迈克尔逊干涉仪及照相法研究了Q 开关Nd:YAG 倍频激光的相干特性。在该实验研究中,测量了相干度|γ(τ)|与程差及输入能量和输入阈值能量比值的函数关系,在输入能量和阈值输入能量比值为3.2时,测得相干长度是40mm,用一迈克尔逊干涉仪,激光束旋转180°后再与自己干涉,从所成干涉条纹可以推断光束的空间相干性。本文对实验结果作了物理解释。更多还原

【Abstract】 The coherence properties of a Q-switched frequency-doubled Nd:YAG laser havebeen investigated by a Michelson interferometer and photography.In this experi-mental study,coherence degree |γ_τ| was measured as a function of pathlengthdifference and of ratio of input energy to threshold input energy.The coherencelength measured was 40mm at a ratio of input energy to threshold energy of 3.2.Spatial coherence of beam was deduced from the fringes formed by a Michelson inter-ferometer in which the laser beam interferes with itself after being rotated 180°,Theexperimental results were physically interpreted.更多还原