Abstract
We investigated phase matching effects on high-order harmonics (HH) generated by a few-cycle parametric source in the near-IR. This source is characterized by 1.5 μm central wavelength, almost transform limited pulse duration of about 20 fs and pulse energy up to 1.2 mJ [1]. In order to generate HH we focused the IR driving pulses on a synchronized gas jet operating at 10 Hz. Characterization of harmonic emission was performed by means of a soft x-ray spectrometer and a micro-channel plate coupled to a phosphor screen and a CCD camera. In this configuration, the spectrometer is set to detect the spectral range between 33 and 150 eV. The harmonic structure is resolved only on a portion of the spectrum, due to the finite instrumental resolution.
© 2009 IEEE
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