Group-delay-dispersion-matched sum-frequency mixing for the indirect phase control of deep ultraviolet pulses in the sub-20-fs regime
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- Nabekawa, Y. & Midorikawa, K. Appl Phys B (2004) 78: 569. doi:10.1007/s00340-004-1415-8
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We have demonstrated a novel scheme of sum-frequency mixing in a nonlinear crystal in order to obtain a wave-vector matching condition with a sufficiently broad spectrum, which can be transformed to an ultrashort pulse of sub-20-fs pulse width, in a deep ultraviolet region. Improving upon the noncollinear angularly dispersed geometry with the group-delay (the first-order dispersion) matching condition, the new scheme with the group-delay-dispersion (the second-order dispersion) matching condition, ensures the spectral width will be broader than 10 nm in the wavelength region of ∼256 nm. This is at the expense of the angular dispersion in the generated UV pulse, which should be compensated. Not only the generation of sub-20-fs pulses but also indirect phase control would be possible if we adopted this novel scheme of sum-frequency mixing.