Optimized ultra-narrow atomic bandpass filters via magneto-optic rotation in an unconstrained geometry

Abstract

Atomic bandpass filters are widely used in a variety of applications, owing to their high peak transmission and narrow bandwidth. Much of the previous literature has used the Faraday effect to realize such filters, where an axial magnetic field is applied across the atomic medium. Here we show that by using a non-axial magnetic field, the performance of these filters can be improved in comparison to the Faraday geometry. We optimize the performance of these filters using a numerical model and verify their performance by direct quantitative comparison with experimental data. We find excellent agreement between experiment and theory. These optimized filters could find use in many of the areas where Faraday filters are currently used, with little modification to the optical setup, allowing for improved performance with relatively little change.

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• An atomic Faraday beam splitter for light generated from pump degenerate four-wave mixing in a hollow-core photonic crystal fiber
• Better magneto-optical filters with cascaded vapor cells in the Faraday-Faraday and Faraday-Voigt geometries
• Coherent Optical Processes on Cs D${}_2$ line Magnetically Induced Transitions
• Atomic line versus lens cavity filters: A comparison of their merits
• Sub-Doppler spectra of sodium $D$ lines in a wide range of magnetic field: theoretical study
• Selective reflection from a Potassium atomic layer with a thickness as small as $\lambda /13$
• Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters
• Self-similarity of optical rotation trajectories around the Poincare sphere with application to an ultra-narrow atomic bandpass filter