Abstract

Coherent control of forward Raman-like scattering by transverse acoustic resonances (ARs) has recently been demonstrated in small-core photonic crystal fibres (PCFs) with large air-filling fractions [1]. A sequence of precisely timed short pulses, duration less than half the AR period, is launched into the PCF. Electrostriction leads to the excitation of an AR, the duration and amplitude of which can be controlled by adjusting the pulse sequence. Strong confinement of both optical waves and ARs in the tiny PCF core enhances the efficiency of this interaction. Since the AR frequency is independent of the optical frequency, the AR can be controlled with multifrequency laser light. Here we demonstrate two new methods of optical control of the scattering process.

© 2009 IEEE