Abstract
The third-order optical nonlinearities, whose potential for optical processing and switching has been understood for many years, have not found wide applications, for the simple reason that typical χ(3) is too small to make the devices based on it practical. Recently, however, a significant progress has been made on the way to change this unfortunate situation, by using cascaded second order nonlinear processes in order to achieve the effective third-order nonlinearity. This method, first realized in [1],[2] suggests the use of the parametric interaction between fundamental and second-harmonic waves in order to obtain effective χ(3) proportional to |χ(2)|2. More recently, a number of cascading schemes utilizing surface-emitting second-harmonic generation in a resonator have been proposed [3].
© 1996 Optical Society of America
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