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This animation is a series of simulated images of PDC light created using the
calculational
capability of the Fortran program available on this
web site.
This calculation was done for a beta-barium borate (BBO) crystal pumped
at 702 nm using Type-II phasematching. Type-II means one of the emitted
PDC photons has ordinary polarization, while its twin has extraordinary
polarization. As a result, each photon of a pair is emitted into
separate, nonconcentric and orthogonally polarized output cones of
light. See how the output light cones change as the crystal optic axis
varies. The curves at the bottom show the wavelength of the PDC light as
a function of its output angle. The upper curve represents the larger
output cone and the lower curve represents the smaller cone. These
particular curves are for light emitted in the horizontal plane. False
color was used for the simulated image to map the 0.6 µm to 1.2 µm
wavelength range into the visible. The gaps in the curves and the
central holes in each light cone are shown to aid the eye in associating
the light cones with the appropriate curves.
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