Measurement of Far-field Divergence Angle of Gaussian Geam Based on Double-shearing Interference
双向剪切干涉法测量高斯光束远场发散角

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 double-shearing 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 an...