Multi-channel lock-in based differential front-end for broadband Raman spectroscopy

In Broadband Stimulated Raman Spectroscopy, the intrinsic limit given by the laser shot noise is seldom reached due to the electronic noise of the front-end amplifier and the intensity fluctuations of the laser source. In this paper we present a low-noise multi-channel acquisition system, with an in...

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Bibliographic Details
Published inIntegration (Amsterdam) Vol. 67; pp. 44 - 49
Main Authors Ragni, A., Sciortino, G., Sampietro, M., Ferrari, G., Polli, D.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.07.2019
Elsevier BV
Subjects
Amplifier
Broadband
Differential
Electric power
Laser
Lasers
Lock-in
Noise
Photodiode
Raman spectroscopy
Shot noise
Signal to noise ratio
Spectrum analysis
Transimpedance
Variations
Lock-in
Broadband
Differential
Noise
Transimpedance
Laser
Photodiode
Raman spectroscopy
Amplifier
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Summary:In Broadband Stimulated Raman Spectroscopy, the intrinsic limit given by the laser shot noise is seldom reached due to the electronic noise of the front-end amplifier and the intensity fluctuations of the laser source. In this paper we present a low-noise multi-channel acquisition system, with an integration-oriented design, able to compensate the common-mode fluctuations of the laser output power with the pseudo-differential structure and reach a sensitivity better than 10 ppm thanks to the lock-in technique. •Low-noise multi-channel acquisition system for broadband Raman spectroscopy.•laser noise compensated with the balanced structure.•Shot-noise limited measurement obtained with lock-in technique.•Validation on a liquid phase methanol sample.•Also designed an ASIC in AMS CMOS 0.35 μm technology.
ISSN:0167-9260
1872-7522
DOI:10.1016/j.vlsi.2019.03.001