Abstract

We present an experimental and numerical study of supercontinuum generation extended in the visible part of the spectrum by using a selective optical coupling of the pump wave in the largely anomalous dispersion regime. The broadband frequency generation is induced by an initial four-wave mixing process that converts the pump wave at 1064nm into 831nm anti-Stokes and 1478nm Stokes wavelengths. Phase matching is ensured on such a large frequency shift thanks to a microstructured multimodal fiber with a specific design. Continuum generation is therefore enhanced around the two generated sidebands.

© 2007 Optical Society of America

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2006 (3)

2005 (2)

2004 (2)

2003 (1)

2002 (2)

2000 (2)

1999 (1)

1998 (1)

1981 (1)

C. Lin and A. Bösch, Appl. Phys. Lett. 38, 479 (1981).
[CrossRef]

1970 (1)

R. R. Alfano and S. L. Shapiro, Phys. Rev. Lett. 24, 584 (1970).
[CrossRef]

Appl. Phys. Lett. (1)

C. Lin and A. Bösch, Appl. Phys. Lett. 38, 479 (1981).
[CrossRef]

Opt. Express (5)

Opt. Lett. (9)

Phys. Rev. Lett. (1)

R. R. Alfano and S. L. Shapiro, Phys. Rev. Lett. 24, 584 (1970).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Numerically calculated dispersion coefficient for the first two spatial modes of the MOF. Inset, fiber cross section imaged by a scanning electron microscope.

Fig. 2
Fig. 2

Calculated (upper curves) and measured sidebands of the modal FWM process with a pump wavelength at 1064 nm (x polarization). Insets, spatial far-field distribution of the guided modes pertaining to the related spectral window.

Fig. 3
Fig. 3

Experimental spectra for a 50 - cm -long fiber versus peak powers for the x polarization. Maximum peak power coupled in the MOF: 2100 W .

Fig. 4
Fig. 4

Experimental SC spectra for two different selective couplings: bimodal excitation LP 01 , x and LP 11 , x ( LP 01 + LP 11 ) : single-mode excitation LP 01 , x (LP 01).

Equations (2)

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k P , 01 + k P , 11 k S , 01 ( Ω ) k A , 11 ( Ω ) = 0 ,
n = 1 h 1 n ! Ω n 1 ( n k 11 Ω n ( 1 ) n 1 n k 01 Ω n ) = 0 .

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