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We demonstrate the phase measurement of a tunable CW-THz radiation at multiple frequencies. The error of the phase measurement with is less than 1 degree at each frequency under correction of the cyclic error. We further applied this method for the absolute distance measurement of a target.
The authors proposed a novel method of phase measurement of terahertz intermode beat in optical frequency comb, to enhance the dynamic-range of distance meter. Utilizing nonlinear optical process, distance measurement with 130 GHz equivalent frequency was realized.
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