The intrinsic sensitivity limit of Stimulated Raman Spectroscopy (SRS) is given by the shot noise of the optical stimulation. However, it is seldom reached due to the electronic noise of the front-end amplifier and the intensity fluctuations of the laser source. Here, we present and test a low-noise pseudo-differential amplifier, for Raman spectroscopy applications, able to compensate the common-mode fluctuations given by the laser and to reach a sensitivity better than 10 ppm thanks to the lock-in technique.

Lock-In Based Differential Front-End for Raman Spectroscopy Applications

Ragni, A.;SCIORTINO, GIUSEPPE;Sampietro, M.;Ferrari, G.;Crisafi, F.;Kumar, V.;Polli, D.
2018-01-01

Abstract

The intrinsic sensitivity limit of Stimulated Raman Spectroscopy (SRS) is given by the shot noise of the optical stimulation. However, it is seldom reached due to the electronic noise of the front-end amplifier and the intensity fluctuations of the laser source. Here, we present and test a low-noise pseudo-differential amplifier, for Raman spectroscopy applications, able to compensate the common-mode fluctuations given by the laser and to reach a sensitivity better than 10 ppm thanks to the lock-in technique.
2018
PRIME 2018 - 14th Conference on Ph.D. Research in Microelectronics and Electronics
9781538653869
amplifier; differential; laser; lock-in; noise; photodiode; Raman Spectroscopy; transimpedance; Electrical and Electronic Engineering; Electronic, Optical and Magnetic Materials; Instrumentation
File in questo prodotto:
File Dimensione Formato  
Andrea Ragni - conference_Prime2018_AR.pdf

accesso aperto

Dimensione 917.4 kB
Formato Adobe PDF
917.4 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1088189
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 2
social impact