TY - JOUR
T1 - Four-Channel Differential Lock-in Amplifiers With Autobalancing Network for Stimulated Raman Spectroscopy
AU - Sciortino, Giuseppe
AU - Ragni, Andrea
AU - De Cadena la, Alejandro
AU - Sampietro, Marco
AU - Cerullo, Giulio
AU - Polli, Dario
AU - Ferrari, Giorgio
N1 - KAUST Repository Item: Exported on 2021-02-16
Acknowledged KAUST grant number(s): OSR2016-CRG5-3017-01
Acknowledgements: This work was supported in part by the European Research Council Consolidator Grant VIBRA (ERC-2014-CoG No. 648615) headed by D. P.;
in part by the EU Project NEBULA under Grant 871658; in part by the EU project TRAINING4CRM H2020 under Grant 722779; in part by the
H2020 project GRAPHENE Flagship (n◦ 785219); in part by the King Abdullah University of Science and Technology (KAUST, project n◦ OSR2016-CRG5-3017-01); and in part by the Italian Ministry of University and Research, Framework per l’Attrazione e il Rafforzamento delle Eccellenze in Italia (FARE) and “Coherent H2 Raman Metrology” project (CH2ROME, no. R164WYYR8N).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2021
Y1 - 2021
N2 - We introduce a multi-channel integrated circuit for fast stimulated Raman scattering (SRS) microscopy on multiple simultaneous frequencies at a frame rate higher than 1 frame/s. The chip is a four-channel differential readout system, based on the lock-in technique. It is able to measure down to 10 ppm SRS signal, over a wide range of input optical powers (50-600 μW per channel), with a pixel dwell time of only 30 μs. Each acquisition channel includes two low-noise preamplifiers, two variable-gain amplifiers, a fully differential voltage subtractor, and a lock-in demodulator. The differential readout electronics rejects the power fluctuations of the laser, and it is automatically balanced by an analog feedback loop over ±30% input power mismatches. Due to the autobalancing network, the pixel dwell time is reduced by a factor up to 225 with a settling time of only 10 μs. The chip is fabricated in AMS 0.35 μm CMOS technology, and it is included in a combined electronics and optical system. Both single-pixel spectral measurements and multi-spectral imaging measurements are presented to validate the full SRS microscope.
AB - We introduce a multi-channel integrated circuit for fast stimulated Raman scattering (SRS) microscopy on multiple simultaneous frequencies at a frame rate higher than 1 frame/s. The chip is a four-channel differential readout system, based on the lock-in technique. It is able to measure down to 10 ppm SRS signal, over a wide range of input optical powers (50-600 μW per channel), with a pixel dwell time of only 30 μs. Each acquisition channel includes two low-noise preamplifiers, two variable-gain amplifiers, a fully differential voltage subtractor, and a lock-in demodulator. The differential readout electronics rejects the power fluctuations of the laser, and it is automatically balanced by an analog feedback loop over ±30% input power mismatches. Due to the autobalancing network, the pixel dwell time is reduced by a factor up to 225 with a settling time of only 10 μs. The chip is fabricated in AMS 0.35 μm CMOS technology, and it is included in a combined electronics and optical system. Both single-pixel spectral measurements and multi-spectral imaging measurements are presented to validate the full SRS microscope.
UR - http://hdl.handle.net/10754/667439
UR - https://ieeexplore.ieee.org/document/9319874/
UR - http://www.scopus.com/inward/record.url?scp=85099549360&partnerID=8YFLogxK
U2 - 10.1109/jssc.2020.3046484
DO - 10.1109/jssc.2020.3046484
M3 - Article
SN - 0018-9200
SP - 1
EP - 1
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
ER -