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Abstract
A femtosecond Ti:sapphire laser is focused into a modulated He-filled slab waveguide to generate high-order harmonics. The modulated slab waveguide is used to periodically vary the intensity of the laser pulse along the direction of propagation in order to implement quasi-phase matching of the high-order harmonics. Experimental results show that compared with the spectra emitted from an unmodulated slab waveguide, there is an obvious increase in the yield of high harmonics at wavelengths close to the cutoff region. This finding is in agreement with theory and calculations reported in previous research. Therefore, our experiment indicates that, as with the modulated hollow-core waveguide, a slab waveguide can also achieve quasi-phase matched high-order harmonics.
Published Version
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