Abstract:Laser frequency stabilization technology is one of the key technologies for quantum precision measurement systems such as high-precision atomic spin inertial, magnetic field, and gravity measurements. Especially when the system has significant pressure shifts, detuned laser frequency stabilization is crucial for achieving high-precision measurements. This paper proposes a detuned laser frequency stabilization method based on a Mach-Zehnder (M-Z) interferometer. By establishing frequency references, frequency shifting, and detuned frequency stabilization control, the method locks the detuned laser frequency required by the system. The paper analyzes the method of establishing a reference frequency based on saturated absorption spectroscopy in a vacuum atomic gas cell. It optimizes the selection of detuned points through optical modulation and finally achieves the locking and noise suppression of the detuned frequency through the M-Z interferometer. The proposed detuned laser frequency stabilization method is based on classical atomic absorption spectroscopy with frequency shifting control. It is simple, reliable, and minimally affected by external environmental factors. This method provides crucial technical support for efficient atomic optical pumping and high-precision atomic spin detection in high-precision atomic spin inertial/magnetic field measurements.