Shape of the spatial mode function of photons generated in noncollinear spontaneous parametric downconversion

Abstract

We show experimentally how noncollinear geometries in spontaneous parametric downconversion induce ellipticity of the shape of the spatial mode function. The degree of ellipticity depends on the pump beam width, especially for highly focused beams. We also discuss the ellipticity induced by the spectrum of the pump beam.

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• Manipulating orbital angular momentum entanglement by using the Heisenberg Uncertainty principle
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• Tailoring the down conversion emission profile via direct imaging with a camera
• Phase matching in $\beta$-barium borate crystals for spontaneous parametric down-conversion
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