Polarization dependent harmonic generation in microstructured fibers.

We report on the control of visible harmonic generation in microstructured fiber through the polarization state of the fundamental radiation. By coupling ë=1.55 ìm femtosecond pulses that have the same peak power into a short length (Z=20 cm) of high- microstructured fiber, we observe the generation of distinct visible spectral components in the visible at the output of the fiber in dependence of the input pulse's polarization state.