Abstract
We present a novel absolute-distance meter based on double heterodyne interferometry. The synthetic wavelength is obtained with a pair of tunable Nd:YAG lasers operating at 1.064 μm. The nonambiguity range of the measurement can be arbitrarily extended by subsequent measurements with different synthetic wavelengths. Experimental results from a prototype breadboard prove the feasibility of a large-nonambiguity-range, high-resolution absolute-distance meter.
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