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White-light supercontinuum generation in normally dispersive optical fiber using original multi-wavelength pumping system

Pierre-Alain Champert, Vincent Couderc, Philippe Leproux, Sébastien Février, Vincent Tombelaine, Laurent Labonté, Philippe Roy, Claude Froehly, and Philippe Nérin

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Abstract

We report on the experimental demonstration of a white-light supercontinuum generation in normally dispersive singlemode air-silica microstructured fiber. We demonstrate that the simultaneous excitation of the microstuctured fiber in its normal and anomalous dispersion regimes using the fundamental and second harmonic signals of a passively Q-switched microchip laser leads to a homogeneous supercontinuum in the visible range. This pumping scheme allows the suppression of the cascaded Raman effect predominance in favor of an efficient spectrum broadening induced by parametric phenomena. A flat supercontinuum extended from 400 to 700 nm is achieved.

©2004 Optical Society of America

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Figures (6)
Fig. 1.
Fig. 1. Experimental set-up and cross sectional scanning electron microscope image of the microstructured air-silica fiber.

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Fig. 2.
Fig. 2. Computed chromatic dispersion (a) and effective area (b) of the fundamental mode of the microstructured fiber versus the wavelength. Inset: transverse energy distribution calculated at λ = 800 nm.

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Fig. 3.
Fig. 3. Continuum generation in normal dispersion regime in the case of single (a) and dual (b) pump configuration. Pictures: diffracted beams. Graph: corresponding recorded power spectra. (a) The cascaded Raman effect is clearly visible in the presence of a single pump (532 nm). (b) The spectrum smoothly and symmetrically broadens when a second pump (1064 nm) is added. The corresponding singlemode transverse energy distribution is shown in inset (far field pattern).

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Fig. 4.
Fig. 4. Continuum power spectrum measured in the infrared range (anomalous dispersion regime).

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Fig. 5.
Fig. 5. Continuum power spectrum obtained in the visible range when using both 532 and 1064 nm pumps, but for an insufficient value of ratio Pω/P2ω.

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Fig. 6.
Fig. 6. Infrared continuum power spectrum obtained in a microstructured fiber fabricated at IRCOM with non flame fused silica glass. No more OH- absorption peak is observable at 1400 nm.

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