Offset locked dual laser system for mts spectroscopy
AssigneeVector Atomic, Inc.
InventorsArman CINGOZ, Martin Machai BOYD, Abijith Sudarsan KOWLIGY, Jonathan David ROSLUND
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Abstract
Embodiments herein describe photonic systems with two laser sources that are tasked with generating the pump and probe optical signals for MTS spectroscopy. However, instead of having the same frequency, a control system can introduce a frequency offset which can be used to filter out interference between the optical signals that can occur before they pass through a vapor cell. In one embodiment, the optical signals are combined and detected at a photodiode that generates a beatnote that can be used to ensure the frequency offset is maintained.
Claims24
A photonic system, comprising:
- a first laser source configured to generate a pump optical signal for modulation transfer spectroscopy (MTS);
- a second laser source configured to generate a probe optical signal for MTS;
- an optical combiner configured to optically combine a portion of the pump and probe optical signals to generate a combined optical signal;
- a photodiode configured to receive the combined optical signal and output a beatnote;
- a control system configured to, based on receiving the beatnote, adjust a parameter of at least one of the first or second laser sources to set a desired frequency offset between the pump and probe optical signals;
- and
- a vapor cell used by the pump and probe optical signals to perform MTS.
A PIC, comprising:
- waveguides configured to:
- direct a first portion of a pump optical signal to a vapor cell for MTS;
- combine a second portion of the pump optical signal with a first portion of a probe optical signal to generate a combined optical signal;
- direct the combined optical signal to a photodiode configured to output a beatnote for maintaining a frequency offset between the pump and probe optical signals;
- and
- direct a second portion of the probe optical signal to the vapor cell for MTS.
A method, comprising:
- receiving two laser signals from two separate laser sources;
- generating a beatnote between the two laser signals using a photodiode;
- setting a desired frequency offset between the two laser signals based on the beatnote;
- modulating one of the two laser signals to generate a pump optical signal, wherein the other of the two laser signals is unmodulated to generate a probe optical signal;
- and
- transmitting the pump optical signal and the probe optical signal to a vapor cell to perform modulation transfer spectroscopy (MTS).
Dependencies are inferred from the claim text.