The wavemeter can measure a wavelength of a tuned laser and an unknown laser. Due to the Doppler shift, the wavemeter operates and establishes coherent interference fringes on the detectors according to the Michelson interference principle. The electronic signals of the reference laser and an unknown laser both are multiplied frequency by PLL(Phase-Locked Loop) unit so as to enhance the resolutions of the wavemeter. PLL unit consists of NE564 and 74LS193.The movable reflector of the wavemeter is driven by a voice-coin motor. The closed loop feedback design can ensure the movable reflector to move in constant speed all the time. Experiment results show that precision of this wavemeter is super to 1×10-6, approaching to 2×10-7.
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