Spectral superbroadening of self-focused picosecond laser pulses in D2O |
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Authors: | A Penzkofer A Beidoun H-J Lehmeier |
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Institution: | (1) Naturwissenschaftliche Fakultät II-Physik, Universität Regensburg, W-8400 Regensburg, Germany;(2) Present address: DASA AG, W-8012 Ottobrunn, Germany |
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Abstract: | Intense picosecond light pulses of a mode-locked Nd: glass laser at
L
=1054 nm (fundamental wavelength) and
SH
=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 ( 1 + 1 3 + 4) and stimulated Raman scattering ( 1
R
+ ![ohgr](/content/r307p4331918l256/xxlarge969.gif) ), which occur concurrently ( 1=
L
or
SH
angular pump frequency, #x03C9;
R
first Stokes frequency, #x03C9; 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 ( erenkov-like) conditions. Subsequent interaction processes are pump-pulse-nondegenerate four-photon interaction of the type 1 +
R
3 + 4 , coherent antiStokes Raman scattering (CARS, 1 + 1 – 4 3), inverse Raman scattering (
A
+ 1 + ![ohgr](/content/r307p4331918l256/xxlarge969.gif) ), and cascading light up-conversion of the type 1 +
(i)
–
R
(i+1). |
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Keywords: | |
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