Abstract

We report on the control of visible harmonic generation in microstructured fiber through the polarization state of the fundamental radiation. By coupling λ=1.55 µm femtosecond pulses that have the same peak power into a short length (Z=20 cm) of high-Δ 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.

© 2002 Optical Society of America

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References

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Appl. Phys. Lett. (1)

R. H. Stolen, J. E. Bjorkholm and A. Ashkin, �??Phase-matched three-wave mixing in silica fiber optical waveguides,�?? Appl. Phys. Lett. 24, 308 (1974).
[CrossRef]

Opt. Commun. (1)

J. Thogersen, J. Mark, �??THG in standard and erbium-doped fibers,�?? Opt. Commun. 110, 435 (1994 ).

Opt. Lett. (6)

Phys. Rev. A (1)

N. Akhmediev and M. Karlsson, �??Cherenkov radiation emitted by solitons in optical fibers,�?? Phys. Rev. A 51, 2602 (1995).
[CrossRef] [PubMed]

Phys. Rev. Lett. (1)

J. Herrmann, U. Griebner, N. Zhavornokov, A. Hukasow, D. Nickel, J.C. Knight, W. J. Wadsworth, P. St. J. Russell and G. Korn, �??Experimental evidence for supercontinuum generation by fission of higher-order solitons in photonic fibers,�?? Phys. Rev. Lett. 88, 173901 (2002).
[CrossRef] [PubMed]

Science (1)

J. C. Knight, J. Broeng, T.A. Birks, P. St. J. Russell, �??Photonic band gap guidance in optical fibers,�?? Science 282, 1476 (1998).
[CrossRef] [PubMed]

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Figures (6)

Fig. 1.
Fig. 1.

Far field mode profiles detected at the ouput of the microstructured fiber for polarization states directed along the two previously identified principal axes α and β. The input to the fiber are pulses at λ=1550 nm, τ~170 fs, with maximum average power of 25 mW (for these experiments). The two outputs are centered at (a) λ= 533 nm and (b) λ=514 nm.

Fig. 2.
Fig. 2.

Plot of modal indices (N=5-25) for λ= 510 nm (black squares), λ= 520 nm (red circles), λ= 530 (green triangles), and modal index for the fundamental as a function of wavelength (black solid line). Phase matching conditions can be identified for the N=21 mode. For further details see text.

Fig. 3.
Fig. 3.

Comparison of the experimentally acquired image of the near field profile of the guided λ=514 nm mode and the calculated profile of the N=21 high order mode supported by the MF in that wavelength range.

Fig. 4.
Fig. 4.

Detected spectra of the fundamental (λ=1550 nm)radiation at the output of the microstructured fiber as a function of power for linearly polarized light along the directions α and β. The shift at P=25 mW (indicated by the arrow) is the same for both polarization states.

Fig. 5.
Fig. 5.

Detected spectra of the visible radiation components at the output of the microstructured fiber as a function of power for both polarization states α and β. The component at 533 nm appears only in one polarization state.

Fig. 6.
Fig. 6.

Scanning electron microscope image of the fiber tip used in the experiment. Various calibrated measurements performed with the microscope reveal mismatches in the 8 to 10% range between the dimensions indicated as a and b in the Figure, resulting in a slight ellipticity of the core of the microstructured fiber.

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