Patent ID: 11913835
Assignee: VECTOR ATOMIC, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. A method, comprising:
modulating input light to generate a modulated pump optical signal;
transmitting the modulated pump optical signal and an unmodulated reference optical signal through a vapor cell in a spectroscopy system using separate and non-crossing optical paths;
determining amplitude filter parameters from optical signals resulting from transmitting the modulated pump optical signal and the unmodulated reference optical signal through the vapor cell;
determining a phase difference from the resulting optical signals, wherein determining the amplitude filter parameters and the phase difference is performed during a calibration phase, the method further comprising, during an operational phase:
detecting a first optical signal resulting from the unmodulated reference optical signal passing through the vapor cell and a second optical signal resulting from the modulated pump optical signal passing through the vapor cell;
phase shifting at least one of the first or second optical signals based on the phase difference;
scaling at least one of the first or second optical signal based on the amplitude filter parameters; and
performing vector subtraction of the first optical signal and the second optical signal to suppress noise.