| Abstract: | High harmonic generation (HHG) of visible and infrared laser pulses is a useful process for production of coherent extreme ultraviolet and soft x-ray radiation from a tabletop system. While a typical spectrum of HHG consists of only odd-order harmonics, HHG spectra of both even and odd harmonics were also demonstrated. In this talk I will present the first method for generating only even-order high harmonics (i.e. without odd-order harmonics). The method is based on quasi-phase matching that enhances only the even-order harmonics.
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