Dual-comb spectroscopy
US11650101B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2022 |
| Grant date | May 16, 2023 |
| Priority date | — |
| Expiry date | Dec 8, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/4332
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dual-comb spectrometer comprising two lasers outputting respective frequency combs having a frequency offset between their intermode beat frequencies. One laser acts as a master and the other as a follower. Although the master laser is driven nominally with a DC drive signal, the current on its drive input line nevertheless oscillates with an AC component that follows the beating of the intermode comb lines lasing in the driven master laser. This effect is exploited by tapping off this AC component and mixing it with a reference frequency to provide the required frequency offset, the mixed signal then being supplied to the follower laser as the AC component of its drive signal. The respective frequency combs in the optical domain are thus phase-locked relative to each other in one degree of freedom, so that the electrical signals obtained by multi-heterodyning the two optical signals are frequency stabilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.