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The laser setup for the investigation of transmission and self-phase modulation of femtosecond laser pulses in a PCF. The inset shows an image of the PCF cross section.
Transmission spectrum of a hollow-core PCF with the period of the structure in the cladding of about 5 mm and an inner diameter of about 14 mm (dashed line) and the spectrum of radiation coming out of an 8-cm PCF measured with 0.9-μJ, 100-fs Ti:sapphire laser pulses coupled into the fiber. The inset shows the spectra of Ti:sapphire laser pulses with an initial pulse duration of 100 fs and an energy of about 1 μJ transmitted through an 8-cm hollow PCF filled with 1 atm of helium (solid line) and atmospheric-pressure air (dashed line).
An autocorrelation trace measured with a 1-mm-thick BBO crystal for unamplified 2-nJ pulses of Ti:sapphire laser radiation at the output of a 5-cm section of a PCF. An autocorrelation trace of the input pulse is shown in the inset.
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