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A compact self-aligning laser radar has been constructed for coheren ranging and velocimetry using a laser diode modulated by feedback from light scattered from a diffusing target. The phenomenology of beat-signal generation in the device is discussed from both experimental and theoretical points of view. The ac-coupled modulation waveform is asymmetric (similar to a sawtooth) and different for the two propagation directions of the light leaving the diode. Atheoreticalmodel, based on the mode structure ofathree-mirrorFabry-Perot cavity, describes signal generation in these experiments and accounts for the asymmetric waveform.
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Groot et al. (1988) studied this question.
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