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Polarization-demultiplexed two-color frequency conversion of femtosecond pulses in birefringent photonic-crystal fibers

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Abstract

Birefringent photonic-crystal fibers provide efficient polarization-sensitive anti-Stokes frequency conversion of unamplified 35-fs Ti: sapphire laser pulses, giving rise to a doublet of intense blue-shifted emission spectral lines centered at 490 and 510 nm. We show that this anti-Stokes doublet can be wavelength-demultiplexed by a polarization-separating prism. Generation of the 510-nm signal is decoupled from frequency conversion to 490 nm by accurately polarizing the pump field along one of the principal axes of the elliptically deformed fiber core.

©2005 Optical Society of America

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Figures (3)

Fig. 1.
Fig. 1. (a) Group-velocity dispersion D calculated with the use of the finite-element method for the doublet of fundamental modes in the PCF shown in the inset with the electric field polarized along (1) the short and (3) the long principal axis of the elliptically deformed fiber core. (b) Polarization-nonselective spectral intensity of PCF output. The image of the output beam is shown in the inset.
Fig. 2.
Fig. 2. Diagram of the experimental setup.
Fig. 3.
Fig. 3. Polarization-demultiplexed output of a birefringent PCF. The pump field is polarized at an angle of (a, b) 90°, (c, d) 0°, and (e, f) 45° with respect to the x-axis. The polarization analyzer selects radiation polarized along (a, c, e) the y-axis and (b, d, f) the x-axis. Respective beam images are shown in the insets.
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