Amplitude-squared and amplitude-cubed squeezing in stimulated Raman and in spontaneous Raman scattering

Abstract

Coherent light coupled to a third-order nonlinear medium is responsible for spontaneous and for stimulated Raman processes. The analytical solutions up to second order in coupling constants of various field modes for spontaneous Raman and for stimulated Raman processes are utilized to obtain the amplitude-squared and amplitude-cubed squeezing of the input coherent light. The amplitude-squared and amplitude-cubed squeezing are completely ruled out for all modes for spontaneous Raman processes. For stimulated Raman processes, we observe that the squeezing for amplitude-squared and amplitude-cubed are possible for pump and for vibrational phonon modes. It is found that the percentage of higher ordered amplitude squeezing decreases with the increase of the orders. The squeezing in Stokes and in anti-Stokes modes are ruled out even for stimulated Raman processes.

Keywords:

• amplitude-squared squeezing
• stimulated Raman scattering

Acknowledgements

We thank the University Grants Commission, Government of India for financial support through a major research project (No. F.10-27/2001(SR)). One of the authors (SM) thanks Professor Jan Perina for his kind interest in this work.