| Abstract
| - Abstract. Intense picosecond light pulses of a mode-locked Nd: glass laser at λL=1054 nm (fundamental wavelength) and λSH=527 nm (second harmonic wavelength) are passed through a sample of D2O under self-focusing conditions. Spectrally structured superbroadened, spatially bell-shaped emission in the forward direction is obtained. Primary generation processes are pump-pulse-degenerate stimulated parametric four-photon interaction (ω1 + ω1 → ω3 + ω4) and stimulated Raman scattering (ω1 → ωR + ωυ), which occur concurrently (ω1=ωL or ωSH angular pump frequency, #x03C9;R first Stokes frequency, #x03C9;υ signal frequency, #x03C9;3 signal frequency, #x03C9;4 idler frequency). The parametric four-photon interaction occurs under collinear non-phase-matched conditions and under longitudinally phase-matched, transversally non-phase-matched (Čerenkov-like) conditions. Subsequent interaction processes are pump-pulse-nondegenerate four-photon interaction of the type ω1 + ωR → ω3′ + ω4′, coherent antiStokes Raman scattering (CARS, ω1 + ω1 − ω4 → ω3), inverse Raman scattering (ωA + ω1 + ωυ), and cascading light up-conversion of the type ω1 + ω(i) − ωR → ω(i+1).
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