Transient measurement of phononic states with covariance-based stochastic spectroscopy.
Light Sci Appl
; 11(1): 44, 2022 Mar 01.
Article
en En
| MEDLINE
| ID: mdl-35228519
ABSTRACT
We present a novel approach to transient Raman spectroscopy, which combines stochastic probe pulses and a covariance-based detection to measure stimulated Raman signals in alpha-quartz. A coherent broadband pump is used to simultaneously impulsively excite a range of different phonon modes, and the phase, amplitude, and energy of each mode are independently recovered as a function of the pump-probe delay by a noisy-probe and covariance-based analysis. Our experimental results and the associated theoretical description demonstrate the feasibility of 2D-Raman experiments based on the stochastic-probe schemes, with new capabilities not available in equivalent mean-value-based 2D-Raman techniques. This work unlocks the gate for nonlinear spectroscopies to capitalize on the information hidden within the noise and overlooked by a mean-value analysis.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Light Sci Appl
Año:
2022
Tipo del documento:
Article
País de afiliación:
Italia