An aperture-truncated Gaussian beam with optimized waist matches the transmissivity of the zero-th order PSW mode despite near-field shape differences.
Slepian, Prolate spheroidal wave functions, Fourier analysis and uncertainty - IV: Extensions to many dimensions; generalized prolate spheroidal functions, Bell Syst
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Optimum-Transmission Free-Space Optical Communications
An aperture-truncated Gaussian beam with optimized waist matches the transmissivity of the zero-th order PSW mode despite near-field shape differences.