Loss and gain signals in broadband stimulated-Raman spectra: Theoretical analysis


Autoria(s): Harbola, Upendra; Umapathy, Siva; Mukamel, Shaul
Data(s)

02/07/2013

Resumo

Stimulated optical signals obtained by subjecting the system to a narrow band and a broadband pulse show both gain and loss Raman features at the red and blue side of the narrow beam, respectively. Recently observed temperature-dependent asymmetry in these features Mallick et al., J. Raman Spectrosc. 42, 1883 (2011); Dang et al., Phys. Rev. Lett. 107, 043001 (2011)] has been attributed to the Stokes and anti-Stokes components of the third-order susceptibility, chi((3)). By treating the setup as a steady state of an open system coupled to four quantum radiation field modes, we show that Stokes and anti-Stokes processes contribute to both the loss and gain resonances. chi((3)) predicts loss and gain signals with equal intensity for electronically off-resonant excitation. Some asymmetry may exist for resonant excitation. However, this is unrelated to the Stokes vs anti-Stokes processes. Any observed temperature-dependent asymmetry must thus originate from effects lying outside the chi((3)) regime.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/46960/1/Phys_Rev_A_88-1_011801_2013.pdf

Harbola, Upendra and Umapathy, Siva and Mukamel, Shaul (2013) Loss and gain signals in broadband stimulated-Raman spectra: Theoretical analysis. In: Physical Review A, 88 (1). 011801_1-011801_4.

Publicador

American Physical Society

Relação

http://dx.doi.org/ 10.1103/PhysRevA.88.011801

http://eprints.iisc.ernet.in/46960/

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Tipo

Journal Article

PeerReviewed