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Experimental characterization of three-wave mixing in a multimode nonlinear waveguide
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup: see text for symbol explanation.

Image of FIG. 2.
FIG. 2.

Transverse intensity distributions of exemplary modes observed in the waveguide at (a) fundamental and (b) SF wavelengths, obtained by imaging the output plane of the waveguide onto a CCD camera.

Image of FIG. 3.
FIG. 3.

The measured normalized SF intensity vs wavelengths of horizontally and vertically polarized fundamental components [(a) and (b)], scanned with 0.2 nm step, and corresponding one-dimensional cross sections at degenerate wavelengths [(c) and (d)]. The components were optimized for coupling in [(a) and (c)] fundamental 00 modes and [(b) and (d)] a combination of and . Each band is labeled with a triplet of interacting spatial modes, identified following the method described in the text. Imperfect excitation of selected spatial modes is seen to generate additional bands. The dashed lines in (a) indicate the spectral region of the down-conversion process defined by a pump field centered at 399.8 nm with 1 nm FWHM.

Image of FIG. 4.
FIG. 4.

Triplets of the interacting spatial modes ordered according to the wavelength of a frequency-degenerate process. Each triplet is represented by a pair of points indicating the measured and calculated (×) SF intensity, normalized to 100 for the band. Triplets involving mode are shown in black, while those involving higher SF modes in gray (red online).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental characterization of three-wave mixing in a multimode nonlinear KTiOPO4 waveguide