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Stimulated Raman scattering in an ethanol core microstructured optical fiber

Sylvie Yiou, Philippe Delaye, Anne Rouvie, Jordi Chinaud, Robert Frey, Gérald Roosen, Pierre Viale, Sébastien Février, Philippe Roy, Jean-Louis Auguste, and Jean-Marc Blondy

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Abstract

We show that high efficiency stimulated Raman scattering can be obtained using hollow core photonic crystal fiber with the core filled with a low refractive index nonlinear liquid. This new architecture opens new perspectives in the development of nonlinear functions as any kind of nonlinear liquid media can now be used to implement them, with original properties not accessible with silica core fibers.

©2005 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. (a) SEM image of used fiber, (b) Optical microscope image of the end of the fiber filled with water and illuminated from above. The peripherical holes were closed on the side where liquid was inserted, and the fiber is observed on the cleaved other side. Only the central hole is filled with the liquid.

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Fig. 2.
Fig. 2. Experimental set-up for the measurement of Stimulated Raman Scattering in liquid core photonic crystal fiber.

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Fig. 3.
Fig. 3. Spectrum of first Stokes lines at 630nm. The bold line represents an adjustment with a Lorentzian profile, with the given width.

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Fig. 4.
Fig. 4. Intensity dependence of the transmitted pump, and Stokes lines as a function of the incident pump beam intensity. The insert shows the Stokes intensities on a log scale allowing a precise determination of the threshold.

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Fig. 5.
Fig. 5. Theoretical dependence of the pump and Stokes lines intensities.

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Tables (1)

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Table 1. Numerical value of the absorption and refractive index of ethanol used in numerical calculations. The absorption coefficients were measured with a 2 cm tank using a spectrophotometer. The refractive indices were calculated from the Cauchy dispersion formula with the coefficients given in [19]

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Equations (3)

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d A p dz = − α p 2 A p − G 0 2 A p ∣ A sl + N sl A p ∣ 2
d A s 1 dz = − α s 1 2 A sl + G 0 2 n p λ p n s 1 λ s 1 ( ∣ A p ∣ 2 ( A s 1 + N s 1 A p ) − A s 1 ∣ A s 2 + N s 2 A s 1 ∣ 2 )
d A s 2 dz = − α s 2 2 A s 2 + G 0 2 n p λ p n s 2 λ s 2 ∣ A s 1 ∣ 2 ( A s 2 + N s 2 A s 1 )
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