Search for: [Abstrakt = "A number of manners to obtain first\-order achromatic phase matching of both type I and type II are presented and the most advantageous ones are identified to generate high\-spectral quality 100\-fs pulses by either parametric generation or frequency up\-conversion. In the case of frequencydoubling high\-energy 5\-fs Ti\:sapphire pulses, a non\-collinear phase\-matching I geometry in a b\-barium borate crystal cut at 44 deg is devised that should allow high conversion efficiency, virtually without pulse lengthening and intra\-pulse frequency chirp due to group\-velocity dispersion."]

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