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Measuring the Complete Transverse Spatial Mode Spectrum of a Wave Field

Calvo, G.F.; Picon, A.; Zambrini,R.
Physical Review Letters 100, 173902 (1-4) (2008)

We put forward a method that allows the experimental determination of the entire spatial mode spectrum of any arbitrary monochromatic wave field in a plane normal to its propagation direction. For coherent optical fields, our spatial spectrum analyzer can be implemented with a small number of benchmark refractive elements embedded in a single Mach-Zender interferometer. We detail an e