Abstract
Shear plates described by Murty1 conveniently provide for the collimation of beams relatively free of higher-order aberrations by measuring the angle of the fringes. By automating the measurement of this angle, shear plates may be used in automated control loops for collimating high power laser beams. We have developed a video based optical processor that yields the Fourier transform of the shearing interferogram at video frame rates. The output from the processor can readily yield the radius of curvature or the sag of the test beam from the centroids of diffraction spots in the Fourier transform plane.
© 1990 Optical Society of America
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