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 Ti:sapphire laser pulses were irradiated into a hollow fiber with an inner diameter of . When the two pulses were temporally overlapped in the hollow fiber, the white-light continuum with the wavelength range of 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 system. As a result, , , transform-limited (TL) pulses with a peak power up to at a repetition rate were generated in the visible to near-infrared region (the over-one-octave bandwidth of ). The fact that the 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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