Methods of using optical frequency comb for angle measurement are discussed. Autocollimation is the most commonly used method for angular displacement measurement. Here, a diffraction grating is attached to the measurement target instead of a mirror, which is used in the conventional autocollimation method. Each mode of the optical frequency comb with a wide wavelength bandwidth is angularly dispersed by the grating. The angular displacement of the target is determined from the most strongly detected optical frequency modes.
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