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International Journal of Optics
Volume 2011, Article ID 629605, 9 pages
http://dx.doi.org/10.1155/2011/629605
Research Article

Higher-Order Amplitude Squeezing in Six-Wave Mixing Process

1Department of Applied Physics, Shri Krishan Institute of Engineering & Technology, Kurukshetra 136118, India
2Department of Physics, Markanda National College, Shahbad, Kurukshetra 136118, India
3Department of Physics, Kurukshetra University, Kurukshetra 136119, India

Received 28 April 2010; Accepted 11 April 2011

Academic Editor: A. Cartaxo

Copyright © 2011 Sunil Rani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigate theoretically the generation of squeezed states in spontaneous and stimulated six-wave mixing process quantum mechanically. It has been found that squeezing occurs in field amplitude, amplitude-squared, amplitude-cubed, and fourth power of field amplitude of fundamental mode in the process. It is found to be dependent on coupling parameter “g” (characteristics of higher-order susceptibility tensor) and phase values of the field amplitude under short-time approximation. Six-wave mixing is a process which involves absorption of three pump photons and emission of two probe photons of the same frequency and a signal photon of different frequency. It is shown that squeezing is greater in a stimulated interaction than the corresponding squeezing in spontaneous process. The degree of squeezing depends upon the photon number in first and higher orders of field amplitude. We study the statistical behaviour of quantum field in the fundamental mode and found it to be sub-Poissonian in nature. The signal-to-noise ratio has been studied in different orders. It is found that signal-to-noise ratio is higher in lower orders. This study when supplemented with experimental observations offers possibility of improving performance of many optical devices and optical communication networks.