Quantum theory of coherent anti-Stokes Raman scattering in three level system
Book
·
OSTI ID:94453
- Indian School of Mines, Dhanbad (India). Dept. of Applied Physics
The optical mixing of sufficiently coherent radiations of frequency {omega}{sub 1} and {omega}{sub 2} inside a suitable molecular medium can result coherent radiation at new frequency {omega}{sub 3} = [{omega}{sub 1} + ({omega}{sub 1} {minus} {omega}{sub 2})]. If {omega}{sub 1} is kept fixed and {omega}{sub 2} is varied so that a condition {omega}{sub 1} {minus} {omega}{sub 2} = {omega} is reached where {omega} is a molecular frequency of the medium, then {omega}{sub 3} = {omega}{sub 1} + {omega} = 2{omega}{sub 1} {minus} {omega}{sub 2}. In this case {omega}{sub 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 the authors 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 quantized. The photon-statistics, coherence characteristics and the occurrence of anti-bunching of the CARS field, in the steady state, are investigated.
- OSTI ID:
- 94453
- Report Number(s):
- CONF-940142--; ISBN 0-8194-1440-9
- Country of Publication:
- United States
- Language:
- English
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