Abstract
We demonstrate a nondestructive axial scanning technique for the spectrally resolved analysis of femtosecond nonlinear–optical transformation in photonic crystal fibers. This technique is applied to map the generation of a polarization–switched third harmonic of femtosecond Cr:forsterite laser pulses in a multimode silica photonic crystal fiber. Obtained results confirmed the intermodal phase–matching to be responsible for the observed polarization dependent multipeak third–harmonic generation. The axial scans revealed, that it is necessary to distinguish between the low and high energy excitation regime of the fiber sample. The proposed technique allows to measure the spectra of nonlinear signals generated in a photonic crystal fiber as a function of the propagation distance without cutting the fiber.
Highlights
Photonic crystal fibers (PCF) [1] are about to accomplish their mission to play substantial role in the field of nonlinear optics
In coincidence with observed behavior four axial scans are shown in Figure 5a–d, with incident polarizations corresponding to 0 degrees for the cases a), b) and 90 degrees for the cases c), d)
Subsequent generation of spectral features in the third harmonic (TH) (Figure 2a, c) showed behavior predicted by the self–phase modulation (SPM)/XPM assisted “multimode anharmonic model” (MAM) [15] resulting in broadened TH features
Summary
We demonstrate a nondestructive axial scanning technique for the spectrally resolved analysis of femtosecond nonlinear–optical transformation in photonic crystal fibers. This technique is applied to map the generation of a polarization–switched third harmonic of femtosecond Cr:forsterite laser pulses in a multimode silica photonic crystal fiber. Obtained results confirmed the intermodal phase–matching to be responsible for the observed polarization dependent multipeak third–harmonic generation. The axial scans revealed, that it is necessary to distinguish between the low and high energy excitation regime of the fiber sample. The proposed technique allows to measure the spectra of nonlinear signals generated in a photonic crystal fiber as a function of the propagation distance without cutting the fiber.
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