General noise suppression scheme with reference detection in heterodyne nonlinear spectroscopy

We devised a novel two-step reference scheme that can greatly suppress the additive and convolutional noises in heterodyne nonlinear spectroscopy. To optimally remove additive noise, we fully utilized the spectral correlation in multi-channel reference data through a linear combination and regressio...

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Bibliographic Details
Published inOptics express Vol. 25; no. 21; pp. 26262 - 26279
Main Authors Feng, Yuan, Vinogradov, Ilya, Ge, Nien-Hui
Format Journal Article
LanguageEnglish
Published United States 16.10.2017
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Summary:We devised a novel two-step reference scheme that can greatly suppress the additive and convolutional noises in heterodyne nonlinear spectroscopy. To optimally remove additive noise, we fully utilized the spectral correlation in multi-channel reference data through a linear combination and regression algorithm. Using our pump-probe 2D IR spectrometer, we demonstrated that our scheme can improve the signal-to-noise ratio by 10-30 times and reach the noise floor of the signal detector. The new algorithm is guaranteed to reduce noise, enables the use of unmatched reference detectors, and does not introduce baseline shift or signal distortion. This scheme is applicable to many heterodyne spectroscopic techniques.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.026262