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Experimental setup: see text for symbol explanation.
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.
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.
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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