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.

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

Ragni A.;Sciortino G.;Sampietro M.;Ferrari G.;Polli D.
2019

Abstract

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.
Amplifier; Broadband; Differential; Laser; Lock-in; Noise; Photodiode; Raman spectroscopy; Transimpedance
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/1095841
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