A set of delay optical path device with long fiber of various lengths are developed. They are applied in the absolute distance measurement system based on the principle of optical balanced cross-correlation. Limited with the repetition rate scanning range of femtosecond laser, dead zone exists in the absolute distance measurement range via a femtosecond optical frequency comb. With the fixed scanning range of repetition rate, the measurement system introduced different length of long fiber can realize different space scanning distance and the resolution of corresponding space scanning distance are given. Meanwhile, the optical path fluctuation of delay optical path with different length is measured by optical balanced cross-correlation absolute distance measurement technology. From the results, it is possible to realize arbitrary absolute distance measurement.
We propose a method of measuring the optical thickness of stacked glass using an absolute distance measurement based on the principle optical balanced cross correlation. The optical balanced cross correlation system is mainly composed of a nonlinear crystal, which is used to generate two second-harmonic sub-pulses. The balanced cross correlation signal will be generated while the measurement pulses and the reference pulses are overlap by scanning the repetition rate. The signal is used as an error signal to lock the repetition rate of the laser by controlling the cavity length. In this study, multiple glasses are pasted one by one with different thickness and the thickness of each glass is measured with sub millimeter precision.
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