Abstract
QND measurement schemes often use Kerr nonlinearity to couple the intensity fluctuations of the signal beam to the phase fluctuations of the probe beam by means of the cross-phase modulation effect. Such schemes use materials with intrinsic χ(3)nonlinearity. However, it has already been shown that Kerr-effect-like correlation between two light waves may be achieved through cascaded χ(2): χ(2) processes. The value of the nonlinearity induced by cascading χ(2) can, in many cases, be much higher than fibre χ(3).
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