Quantum theory of coherent anti-Stokes Raman scattering in three-level system

Partha Sarathi Gupta; J. Dash

doi:10.1117/12.177161

2 June 1994 Quantum theory of coherent anti-Stokes Raman scattering in three-level system

Partha Sarathi Gupta, J. Dash

Proceedings Volume 2145, Nonlinear Optics for High-Speed Electronics and Optical Frequency Conversion; (1994) https://doi.org/10.1117/12.177161
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The optical mixing of sufficiently coherent radiations of frequency (omega) ₁ and (omega) ₂ inside a suitable molecular medium can result coherent radiation at new frequency (omega) ₃ equals [(omega) ₁ + ((omega) ₁ - (omega) ₂)]. If (omega) ₁ is kept fixed and (omega) ₂ is varied so that a condition (omega) ₁ - (omega) ₂ equals (omega) is reached where (omega) is a molecular frequency of the medium, then (omega) ₃ equals (omega) ₁ + (omega) equals 2(omega) ₁ - (omega) ₂. In this case (omega) ₃ coincides with the anti- Stokes Raman frequency associated with the molecular frequency (omega) . This process of coherent anti-Stokes Raman Scattering (CARS) is an important nonlinear optical process which provides intense collimated signal beams and is also an excellent spectroscopic tool. CARS being a four-wave mixing process, it is of interest to study the process in multi-level system to obtain a better insight into the problem. In the current paper we investigate the different quantum statistical properties of CARS in a inhomogeneously broadened three-level system based on density-matrix formalism where both the atomic system and the radiation fields are quantised. The photon-statistics, coherence characteristics and the occurrence of anti-bunching of the CARS field, in the steady state, are investigated.

Citation Download Citation

Partha Sarathi Gupta and J. Dash "Quantum theory of coherent anti-Stokes Raman scattering in three-level system", Proc. SPIE 2145, Nonlinear Optics for High-Speed Electronics and Optical Frequency Conversion, (2 June 1994); https://doi.org/10.1117/12.177161

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