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Thanks. Not chasing shg on this setup. It’s sum difference. But most of that applies. I will check it out today and it think your right on the interferometer. That could be half the problem.
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I've done that before to characterize hologram optical elements for diffraction efficiency vs. angle. Fixed input beam, HOE mounted on axis of a motor-driven rotation stage, arm with detector mounted on another motor-driven rotation stage (both axis' of rotation collinear), with the detector stage driven twice as fast as the first.
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