Optical vortex filtering for the detection of Electromagnetically Induced Transparency

TL;DR

This paper presents an optical vortex filter that effectively isolates weak signals in electromagnetically induced transparency experiments, offering frequency and polarization insensitivity for broad applications.

Contribution

The authors demonstrate a novel optical vortex filter capable of selectively detecting weak coherent fields amidst strong control fields in EIT, with broad applicability due to its insensitivity to frequency and polarization.

Findings

Successfully eliminated strong control field while detecting weak EIT signal

Demonstrated insensitivity to optical frequency and polarization

Applicable to various coherent optical processes

Abstract

We report the realization of an optical filter based on an optical vortex mask designed to exclusively detect a weak coherent laser field in the presence of much stronger spatially-overlapping field. We demonstrate the performance of such an optical vortex filter to eliminate the strong control field and detect only a weak optical field's transmission under the conditions of electromagnetically induced transparency. The attractive feature of such filter is its insensitivity to optical field frequencies and polarizations, which makes it applicable for a wide range of coherent processes.