Journal article
Edge-pixel referencing suppresses correlated baseline noise in heterodyned spectroscopies
The Journal of chemical physics, Vol.152(9), pp.094201-094201
03/07/2020
DOI: 10.1063/1.5134987
PMID: 33480715
Abstract
Referencing schemes are commonly used in heterodyned spectroscopies to mitigate correlated baseline noise arising from shot-to-shot fluctuations of the local oscillator. Although successful, these methods rely on careful pixel-to-pixel matching between the two spectrographs. A recent scheme introduced by Feng et al. [Opt. Express 27(15), 20323-20346 (2019)] employed a correlation matrix to allow free mapping between dissimilar spectrographs, leading to the first demonstration of floor noise limited detection on a multichannel array used in heterodyned spectroscopy. In addition to their primary results using a second reference spectrometer, Feng et al. briefly demonstrated the flexibility of their method by referencing to same-array pixels at the two spectral edges (i.e., edge-pixel referencing). We present a comprehensive study of this approach, which we term edge-pixel referencing, including optimization of the approach, assessment of the performance, and determination of the effects of background responses. We show that, within some limitations, the distortions due to background signals will not affect the 2D IR line shape or amplitude and can be mitigated by band narrowing of the pump beams. We also show that the performance of edge-pixel referencing is comparable to that of referencing to a second spectrometer in terms of noise suppression and that the line shapes and amplitudes of the spectral features are, within the measurement error, identical. Altogether, these results demonstrate that edge-pixel referencing is a powerful approach for noise suppression in heterodyned spectroscopies, which requires no new hardware and, so, can be implemented as a software solution for anyone performing heterodyned spectroscopy with multichannel array detectors already.
Details
- Title: Subtitle
- Edge-pixel referencing suppresses correlated baseline noise in heterodyned spectroscopies
- Creators
- Kevin C Robben - Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USAChristopher M Cheatum - Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA
- Resource Type
- Journal article
- Publication Details
- The Journal of chemical physics, Vol.152(9), pp.094201-094201
- DOI
- 10.1063/1.5134987
- PMID
- 33480715
- ISSN
- 0021-9606
- eISSN
- 1089-7690
- Grant note
- DOI: 10.13039/100000001, name: National Science Foundation, award: CHE-1707598
- Language
- English
- Date published
- 03/07/2020
- Academic Unit
- Liberal Arts and Science Admin; Chemistry
- Record Identifier
- 9984216596802771
Metrics
11 Record Views