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Manipulation of intense pulse propagation in gas-filled capillaries isdesirable for various high-field applications. Tuning the parameters of thedriving laser pulse and the working gas is the conventional approach, and itprovides limited capability of control. Here we demonstrate through numericalsimulations a practical scheme to control the propagation of intense pulses. Aweak ultraviolet pulse is launched into a capillary with a negative delay withrespect to a main infrared pulse. The pulses begin to temporally overlap due todispersion. As the main pulse self-compresses, the control pulse is stronglyred-shifted due to cross-phase modulation. The frequency shifts of the twopulses mitigate pulse walk-off and allow an efficient coupling, substantiallyextending the effective interaction length. This interesting phenomenon maybenefit applications such as high-order harmonic generation.

Control of spatiotemporal localization of infrared pulses in gas-filled capillaries using weak ultraviolet pulses