Aiming at the wavelength locking of vertical cavity surface emitting lasers (VCSEL), the principle of atomic transition spectrum locking based on low frequency modulation and demodulation was analyzed, and the laser wavelength locking circuits were designed and realized by using digital phase detection algorithm. VCSEL wavelength locking circuits were mainly composed of temperature control circuit, laser driven current source and digital phase detector, and the principle design of each circuit was given respectively. The designed VCSEL wavelength locking circuits have been tested and successfully applied to coherent population trapping (CPT) atomic clock, locked the multi-spectrum of 133Cs and realized the observation of CPT signal.
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