Interferometric sorting of temporal Hermite-Gauss modes via temporal Gouy phase
Abstract
We propose a device consisting of m Mach-Zehnder interferometers and realizing sorting of first 2m temporal Hermite-Gauss modes of light passing though it by adjusting the accumulated temporal Gouy phase acquired by every mode. This mode-order-dependent phase shift is achieved by a fractional Fourier transform realized by a time lens in one of interferometer's arms. We consider application of such a sorter with just two interferometers to sorting the Schmidt modes of a photon pair generated in spontaneous parametric downconversion and find the theoretical lower bond on the cross-talk probability of 5.5%.
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