Fast computational phase and timing correction for multiheterodyne spectroscopy
US11499867B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2021 |
| Grant date | Nov 15, 2022 |
| Priority date | — |
| Expiry date | May 12, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/104
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed herein is an all-digital phase and timing correction procedure for coherent averaging in dual-comb and multiheterodyne spectroscopy—applicable to any dual-comb spectroscopy setup. It can account for large frequency/phase instabilities of the used sources, yielding a significant reduction of the noise pedestal and an increase in signal-to-noise ratio (SNR) of the radio frequency (RF) beat notes. This technique is computationally efficient and can be conveniently implemented either as a post-processing algorithm or in a real-time data acquisition and processing platform without the necessity of adding any additional optical elements to the dual-comb spectroscopy system. By implementing this technique, the performance of any comb- or comb-like-source-based DCS system with a sufficient degree of mutual coherence between the optical modes can be improved in terms of SNR and number of spectroscopically-usable RF beat notes. The described technique is compatible with a DC-centered RF spectrum, where the negative frequencies are folded to the positive domain to double the number of beat notes within the detector bandwidth. The technique enables coherent averaging over extended ti…
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