Abstract

We propose a novel high-efficiency no-moving-parts Laguerre–Gauss (LG) spectrometer using two variable focus lenses and a variable-sized pinhole that overcomes the limitations of the classical, projective, phase-flattening technique for measuring the LG spectrum of light beams. Simulation results show that the coupling losses are virtually zero and the only losses are ring losses, which are mode-dependent but beam-waist-independent. Hence, the detection efficiency for all modes is simultaneously the maximum possible irrespective of the beam waist of the LG modes chosen for the decomposition. The losses can also be easily pre-calibrated to remove the efficiency bias among different modes.

© 2016 Optical Society of America

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