An atomic sensor system comprising: a vapor cell comprising alkali metal atoms; a magnetic field generator for generating a bias magnetic field in the vapor cell; a pump laser configured to generate an optical pump beam (OPT PMB) that is provided through the vapor cell for spin-polarizing the alkali metal in the presence of said bias magnetic field; a probe laser configured to generate an optical probe beam (OPT PRB) that is modulated about a center frequency and which is provided through the vapor cell; a photodetector assembly comprising a polarizing beam-splitter, a first photodetector, and a second photodetector, the photodetector assembly configured to separate a detection beam (OPT DET) that is associated with the optical probe beam (OPT PRB) provided through the vapor cell as the optical probe beam (OPT PRB) exits the vapor cell into first and second orthogonal polarization signal components, wherein the first and second photodetectors (26, 28) are configured to generate a first intensity signal (INTS 1) and a second intensity signal (INTS 2) corresponding to the first and second orthogonal polarization signal components, respectively, and wherein the first and second intensity signals (INTS 1, INTS 2) correspond to a Faraday rotation associated with the detection beam (OPT DET) based on the alkali metal atoms; and a detection system (30, 150) comprising: - a summation component configured to add the first and second intensity signals (INTS 1, INTS 2) to generate a summation signal; and - a probe controller (32, 154) configured to demodulate the summation signal at a frequency corresponding to a modulation frequency of the optical probe beam (OPT PRB) and to generate a feedback signal (DFBK) based on the demodulated summation signal that is provided to the probe laser to stabilize the center frequency of the optical probe beam (OPT PRB) based on the feedback signal (DFBK). a vapor cell comprising alkali metal atoms; a magnetic field generator for generating a bias magnetic field in the vapor cell; a pump laser configured to generate an optical pump beam (OPT PMB) that is provided through the vapor cell for spin-polarizing the alkali metal in the presence of said bias magnetic field; a probe laser configured to generate an optical probe beam (OPT PRB) that is modulated about a center frequency and which is provided through the vapor cell; a photodetector assembly comprising a polarizing beam-splitter, a first photodetector, and a second photodetector, the photodetector assembly configured to separate a detection beam (OPT DET) that is associated with the optical probe beam (OPT PRB) provided through the vapor cell as the optical probe beam (OPT PRB) exits the vapor cell into first and second orthogonal polarization signal components, wherein the first and second photodetectors (26, 28) are configured to generate a first intensity signal (INTS 1) and a second intensity signal (INTS 2) corresponding to the first and second orthogonal polarization signal components, respectively, and wherein the first and second intensity signals (INTS 1, INTS 2) correspond to a Faraday rotation associated with the detection beam (OPT DET) based on the alkali metal atoms; and a detection system (30, 150) comprising: - a summation component configured to add the first and second intensity signals (INTS 1, INTS 2) to generate a summation signal; and - a probe controller (32, 154) configured to demodulate the summation signal at a frequency corresponding to a modulation frequency of the optical probe beam (OPT PRB) and to generate a feedback signal (DFBK) based on the demodulated summation signal that is provided to the probe laser to stabilize the center frequency of the optical probe beam (OPT PRB) based on the feedback signal (DFBK). - a summation component configured to add the first and second intensity signals (INTS 1, INTS 2) to generate a summation signal; and - a probe controller (32, 154) configured to demodulate the summation signal at a frequency corresponding to a modulation frequency of the optical probe beam (OPT PRB) and to generate a feedback signal (DFBK) based on the demodulated summation signal that is provided to the probe laser to stabilize the center frequency of the optical probe beam (OPT PRB) based on the feedback signal (DFBK).