Calculation of the signal time-profile in transient CARS experiments
Anno: 1991
Autori: Torre R., Righini R., Foggi P., Angeloni L.
Affiliazione autori: European Laboratory for Non Linear Spectroscopy (LENS), Università di Firenze, Florence, I-50125, Italy; Dipartimento di Fisica, Università di Firenze, Florence, I-50125, Italy; Dipartimento di Chimica, Università di Firenze, Florence, I-50121, Italy
Abstract: The expressions for the resonant and non-resonant contributions to the CARS signal in a time-resolved CARS experiment are derived on the basis of a diagrammatic perturbative expansion of the polarization. The laser fields are assumed to be off-resonance with respect to any electronic level of the system. The probe pulse is supposed to be derived from one of the two pump pulses (?1). Under this assumption the effect of the noise content of ?1 laser pulses on the signal time-profile (coherence artefact) is correctly reproduced by modelling the noise as a stationary stochastic process. The choice of appropriate polarization geometries is shown to allow for direct measurement of the individual contributions to the CARS signal; the experiments performed on a KClO4 single crystal fully confirm the results of the calculation based on our theoretical treatment.
Giornale/Rivista: APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY
Volume: 52 (2) Da Pagina: 132 A: 137
Parole chiavi: Laser Beams – Polarization; Light – Nonlinear Optical Effects; Potassium Compounds – Spectroscopic Analysis, Coherent Anti-Stokes Raman Spectroscopy; Nonlinear Polarization, Spectroscopy, RamanDOI: 10.1007/BF00357667Citazioni: 3dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-05Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui