Patent ID: 11967799
Assignee: PILOT PHOTONICS LIMITED
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 26:
27. An apparatus for performing spectroscopy, the apparatus comprising:
an optical frequency comb source configured to provide an optical frequency comb,
an element configurable to direct the optical frequency comb through or at a sample,
a gain-switched laser diode that is driven with a radio frequency (RF) signal,
wherein the comb source uses the gain-switched laser diode to injection lock the optical frequency comb, thereby providing an injection locked gain switched optical frequency comb,
wherein a comb spacing of the injection locked gain switched optical frequency comb is reconfigured by altering frequency of the RF signal, and
wherein spectroscopic measurements representative of interaction of one or more comb lines in the injection locked gain switched optical frequency comb with the sample are obtained when the injection locked gain switched optical frequency comb is directed through or at the sample, and
a controller configured to:
adjust center frequency of the injection locked gain switched optical frequency comb to a known absorption band or gap;
adjust a comb source to cause one or more comb lines to interact with molecular absorption bands of the molecule;
determine distances to absorption peaks by monitoring changes in transmission; and
determine presence of a molecule and its relative concentration based on the distances to the absorption peaks.