Generation of 30-fs ultraviolet pulses by four-wave optical parametric chirped pulse amplification

Abstract

We report on the generation of approximately 30-fs ultraviolet pulses with approximately 10 microJ energy by means of four-wave optical parametric chirped pulse amplification in fused silica. The four-wave optical parametric amplifier is pumped by the second-harmonic of the Ti:sapphire laser and is seeded by visible broadband chirped signal pulses. The idler pulses are produced in the ultraviolet by four-wave mixing and are compressed in a medium with normal group velocity dispersion.

High intensity vacuum ultraviolet and extreme ultraviolet production by noncollinear mixing in laser vaporized media

“…11 Chénais et al reported the dependence of the "enhancement ratio," defined as the ratio of the VUV intensity with the vaporization laser on relative to that with the vaporization laser off, as a function of UV, visible, and ablation laser beam pulse energies. 29 We have carried out similar experiments but instead report the relative intensity of the VUV generated as functions of the three input laser pulse energies, shown in Fig. 5.…”

“…LiF, CaF 2 or fused silica. [28][29][30][31] In these cases, the intersection angle of the input beams were chosen to optimize phase-matching conditions for four-wave mixing. In our experiments, the input wavelength is scanned to optimize phase-matching for a given crossing angle.…”

Generation of tunable infrared femtosecond pulses via parametric visible-to-infrared frequency conversion

“…This offers an additional degree of freedom in frequency conversion. Indeed, by taking an advantage of this possibility, generation of UV laser harmonics by means of fourwave difference frequency mixing [20] and UV-tunable 30-fs pulses by parametric frequency up-conversion of visible pulses [21] was demonstrated. More recently, a similar technique was applied in the near-IR spectral range, yielding broadly tunable sub-30 fs pulses from fused silica based four-wave optical parametric amplifier [22].…”

Generation of sub-20-fs deep-ultraviolet pulses by using chirped-pulse four-wave mixing in CaF_2 plate

“…The generation of sub-20-fs DUV pulses using nondegenerate chirped-pulse FWM of the fundamental and SH pulses, produced by a commercial Ti:sapphire amplifier in a bulk material appears more compact and cheaper than the frequency doubling of OPA [6] or FWM with OPA [15] because of the high cost and large setup for an OPA system. It also consumes less pump energy and has a higher conversion efficiency than FWM in hollow fiber or noble gas-filled cells [7][8][9].…”