Pulse propagation in a medium optically dressed by a phase-modulated field

TL;DR

This paper investigates how phase-modulated control fields affect pulse propagation in an EIT medium, revealing conditions for transparency and spectral evolution using numerical and approximate methods.

Contribution

It introduces a novel analysis of pulse behavior in EIT media with phase-modulated control fields, combining numerical and approximate approaches.

Findings

Transparency occurs for narrow probe pulses with suitable chirp

Spectral evolution depends on pulse and medium parameters

A projection method separates transparent and opaque pulse components

Abstract

Pulse propagation is studied in an EIT medium with the control field having a periodically varying phase (chirp). Based both on numerical calculations and on an approximate approach neglecting absorption and nonadiabatic effects, it is shown that transparency occurs for probe pulses having a sufficiently narrow envelope and an appropriately suited chirp. For other chirped pulses the evolution of their spectra along a sample is studied. Using a projection method one can divide a pulse into a part for which the medium is transparent and a rest for which it is opaque.