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Impact of temporal, spatial and cascaded effects on the pulse formation in ultra-broadband parametric amplifiers

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Abstract

A 2 + 1 dimensional nonlinear pulse propagation model is presented, illustrating the weighting of different effects for the parametric amplification of ultra-broadband spectra in different regimes of energy scaling. Typical features in the distribution of intensity and phase of state-of-the-art OPA-systems can be understood by cascaded spatial and temporal effects.

©2013 Optical Society of America

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Supplementary Material (1)

Media 1: MOV (4056 KB)     

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Figures (4)

Fig. 1
Fig. 1 Left: (a) Simulation data from both, the ordinary field with idler and signal, and the extra-ordinary field with pump, idler-SH, and signal-SH normalized to the maximum ordinary peak intensity. Phase matching is indicated by the DFG- (black double) and collinear SH phase matching curve (green dotted). The graphic representation with respect to a propagation angle instead of a spatial frequency leads to non-rectangular boarders of the window indicated by the shaded area. Right: Normalized intensity in time and space of: (b) pump pulse together with signal-SH and idler-SH, (c) signal pulse with the power spectrum and parametric phase in the inset and (d) angularly dispersed idler pulse.
Fig. 2
Fig. 2 (a): Calculated conversion efficiency curve considering broadest phase-matching for 5 mm BBO pumped at 343 nm (blue shaded) and at 515 nm (green shaded) and the calculated parametric phase curves (solid curves) [10, 11] respectively, the measured 1.5 octave spanning output spectrum (red shaded) and the measured phase (red dotted) after compression by DCM’s spanning from 600 nm to 1000 nm, and the seed spectrum for the second stage (black dotted). (b) The simulated spectrum (black solid) and phase (black dotted) underlayed by the measured spectrum (red shaded) and phase (red dotted); the temporal pulse shape of simulation (black) and measurement (red) is in the inset.
Fig. 3
Fig. 3 (a) Simulated intensities after the second stage of the two-color OPA (normalized to the maximum ordinary peak intensity). (b) Pump pulse- with signal-SH and idler-SH. (c) signal pulse [inset: signal pulse in the tangential geometry]. (d) angular dispersive idler pulse in time and space.
Fig. 4
Fig. 4 Comparison between the two non-collinear phase-matching geometries, Poynting vector walk-off compensation (PVWC) and tangential (TPM) geometry, with different pump spot sizes (1/e2 radius) and crystal lengths. Simulated beam profiles of pump, idler, and signal pulses in time and one transversal dimension in the principle phase-matching plane of BBO. The diagrams show the simulated signal-spectra (black solid) as well as measured spectra (red shaded) and the measured parametric GD (red dotted). The simulated parametric GD (black dotted) is evaluated along the red line in the colored map on top of each example illustrating the non-collinear angle distribution of the signal spectral intensity. The evolution of each scenario in respect to the position along the crystal clarifies the interplay between all pulses and the origin of spectral and temporal changes in the seed pulse (Media 1).

Equations (3)

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Δθ( f t , f x )=arcsin f x f t c n o/e ,
E o/e ( f t , f x ,z+dz)= E o/e ( f t , f x ,z)exp( i | k( f t , n o/e ) | 2 k x ( f x ) 2 dz ),
E o ( t,x ) z 1 κ o =i( 2 E e E o * oo-e + E e E e ee-o TypeI + E e E e * eo-e + E o E e * eo-o + E e E o eo-o Type II ) E e ( t,x ) z 1 κ e =i( E o E o oo-e + 2 E o E e * ee-o + E e E o * eo-e + E e E o eo-e + E o E o * eo-o ),
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