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Efficient white light generation in secondary cores of holey fibers

P. Dupriez, F. Poletti, P. Horak, M. N. Petrovich, Y. Jeong, J. Nilsson, D. J. Richardson, and D. N. Payne

Open Access Open Access

Abstract

We report the generation of white light from a picosecond pump by efficient four-wave mixing processes. A 530 nm green source based on a frequency-doubled Yb-doped fiber laser generates strong red and blue sidebands in the secondary cores of a holey fiber with large air-filling factor. Phase matching is attributed to birefringence within the sub-micrometer-sized secondary cores induced by non-symmetric deformation during the fiber drawing.

©2007 Optical Society of America

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Figures (8)
Fig. 1.
Fig. 1. Experimental arrangement for the generation of RGB in a single secondary core of a holey fiber. LBO: Lithium Triborate (LiB3O5) crystal, λ/2: half-wave plate at respective wavelengths.

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Fig. 2.
Fig. 2. Typical SEM images of the fibers used for RGB generation.

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Fig. 3.
Fig. 3. Normalized output spectra obtained from fibers A-E, and corresponding dispersion profiles calculated for a single secondary core as shown in Fig. 2.

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Fig. 4.
Fig. 4. Left: Diffracted picture of the RGB components generated by fiber D. Right: The fiber output observed in the green showing the location of the single excited core.

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Fig. 5.
Fig. 5. Idealized structure used in the simulations: single-core (a) and double-core (b). In this example Λ = 3.66 μm, d/Λ = 0.935, rc/d = 0.25. (c) High magnification SEM image of fiber C, and (d) detail of the simulated profile.

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Fig. 6.
Fig. 6. Simulation results for the structure in Fig. 5(d): Effective indices of the first 12 modes (left); Mode intensity and polarization distribution of the first 4 modes at 530 nm (right).

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Fig. 7.
Fig. 7. Phase matching curves for the modes of Fig. 6 (corresponding to fiber C): The pump is in mode M1, while signal and idler are in the orthogonally polarized mode M2. The yellow band refers to the pump used in the experiments.

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Fig. 8.
Fig. 8. Simulated birefringence at 530 nm when a deformation (linear scaling) is applied along the x and y directions to a single core with structural parameters corresponding to 3 of the fibers under examination.

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