摘要
对双向剪切干涉理论和高斯光束传输特性进行了研究.提出了一种测量高斯光束远场发散角的方法:利用双向剪切干涉仪分别在激光传输路径上两个特定位置测出波前曲率半径,然后由曲率半径得出发散角.通过理论推导建立了相应的检测模型,并对模型进行了实验验证.实验测量和误差分析表明该方法的测量准确度能达到10″;发散角测量准确度的主要影响因素为干涉条纹宽度测量误差.
Propagation characteristics of Gaussian beam and double-shearing interference theories were studied, A method for measuring the far-field divergence angle of Gaussian beam was presented. A doubleshearing interferometer was used in this method to measure wavefront radiuses of curvature at two certain positions in the path of the laser beam. Then,the divergence angle can be obtained from the radiuses. The measurement model was built by theoretical derivation and verified by experiment. Experimental measurement and error analysis show that this method has an accuracy of 10＂, It also shows that the error of shearing interference fringe width is the major factor which affects the divergence angle measuring accuracy. The measurement accuracy can be greatly improved by reducing the fringe width error.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2008年第11期2327-2331,共5页
Acta Photonica Sinica
关键词
光学测量
双向剪切干涉
发散角
高斯光束
Optical measurement
Double-shearing interference
Divergence angle Gaussian beam
