Abstract

When a weak probe and a strong pump pulses propagate together in a material, coupled interactions occur through the third order nonlinearity. This process leads to the self-phase-modulation (SPM) and cross-phase-modulation (XPM). The spectral shift of XPM can be controlled by adjusting the time delay between the pump and probe pulses.¹ When the pump and probe totally overlap, the probe pulse has a frequency broadening similar to that of the pump pulse. When the probe pulse overlaps with the leading edge of the pump pulse, the phase of the probe pulse is modulated by the index change caused by the leading edge of the pump pulse and its frequency is red-shifted. When the probe pulse overlaps with the trailing edge of the probe pulse, the phase of the probe pulse is modulated by the index change caused by the trailing edge of the pump pulse and its frequency is blue-shifted.

© 1993 Optical Society of America