High efficiency phase flattening based Laguerre-Gauss (LG) spectrometer using variable focus lenses

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 Laguerre-Gauss (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 amongst different modes.

arXiv comment6 pages, 6 figures

References in corpus (4)

• Entanglement of Orbital Angular Momentum States of Photons
• Limitations to the determination of a Laguerre-Gauss spectrum via projective, phase-flattening measurement
• Comment on "Measuring the Orbital Angular Momentum of a Single Photon"
• Determining the dimensionality of bipartite orbital-angular-momentum entanglement using multi-sector phase masks

Cited by in corpus (1)

• Measurement of the vortex spectrum in a vortex-beam array without cuts and gluing of the wavefront