Abstract

We report quasi-one-optical-cycle pulse compression of the ultrabroadband white-light continuum generated using both induced-phase modulation (IPM) and self-phase modulation (SPM) in a 3.0 atom Ar-gas-filled hollow fiber. Fundamental and second harmonic waves of amplified 30fs Ti:sapphire laser pulses were irradiated into a 37cm hollow fiber with an inner diameter of 140μm. When the two pulses were temporally overlapped in the hollow fiber, the white-light continuum with the wavelength range of 3501050nm was generated. The spectral phase of the white-light continuum was measured by a modified spectral interferometry for direct electric-field reconstruction, and quasi-automatic feedback chirp compensation was carried out using a programmable liquid-crystal spatial light modulator placed on the Fourier plane of a 4-f system. As a result, 2.6fs, 3.6μJ, 1.3  cycle transform-limited (TL) pulses with a peak power up to 1.4GW at a 1kHz repetition rate were generated in the visible to near-infrared region (the over-one-octave bandwidth of 450975nm). The fact that the IPM+SPM light was compressed to the TL duration is important toward the generation of a single, intense one-optical-cycle pulse in the visible region.

© 2007 Optical Society of America

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