Spatial Characterization Of Two-Photon States - GAP-Optique
Spatial Characterization Of Two-Photon States - GAP-Optique
Spatial Characterization Of Two-Photon States - GAP-Optique
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C. Methods for OAM measurements<br />
Input hologram<br />
lens<br />
Gaussian<br />
mode<br />
non-Gaussian<br />
mode<br />
Figure C.1: A hologram that records the interference of a lg mode with a Gaussian<br />
beam, can be used to detect that particular lg mode. Only if the generating lg<br />
mode is incident on the hologram, a Gaussian beam is recovered. If another mode is<br />
incident, the hologram will generate non-Gaussian beams. Single mode optical fibers<br />
distinguish between Gaussian and non-Gaussian beams.<br />
Input<br />
beam splitter<br />
Dove prism mirror<br />
even modes<br />
odd modes<br />
Figure C.2: <strong>Two</strong> Dove prisms rotated with respect to each other by an angle π/2<br />
induce a relative rotation of π between the two arms of a Mach-Zender interferometer.<br />
As a consequence of the rotation, odd and even lg modes leave the interferometer<br />
at different outputs after the second beam splitter. Reference [15] introduces this<br />
principle as a base of an oam sorter.<br />
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