"Sub-20-fs pulses tunable across the visible from a blue pumped single pass noncollinear parametric converter"T. Wilhelm, J. Piel, E. Riedle
Opt. Lett. 22, 1494 - 1496 (1997)
Femtosecond pulses with center wavelengths between 470 and 750 nm are generatedin a single stage type I BBO optical parametric amplifier pumped by a frequencydoubled 1 kHz Ti:sapphire amplifier. A high quality white-light continuum is used as theseed. Pulse durations as short as 16 fs and pulse energies as high as 11 µJ areobserved. The quantum efficiency is ~ 25 % for both 7 and 40 µJ pump pulses. Thisunique combination of ultrashort pulse duration and high conversion is made possibleby noncollinear phase matching that permits a sufficiently large amplification bandwidth.Simultaneously the group velocities of signal and idler are effectively matched. As aresult widely tunable sub-20-fs pulses can be generated in a nonlinear crystal asthick as 2 mm.
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