Abstract
It has been recently demonstrated (Opt. Lett. 32 p178, 2007) that relative intensity squeezed light beams can be produced by non-degenerate four-wave mixing (4WM) in rubidium vapour. Using a system based on the lambda-structure of the 5S ground state of Rb, they obtained noise reduction of −7.1 dB below the standard quantum limit. We present a new scheme using the cascade 5S-5P-5D levels of Rb, which should achieve strong relative intensity squeezing at low Fourier frequency and low (~10mW) laser power.
© 2007 Optical Society of America
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