Time reversal of light by linear dispersive filtering near atomic resonance

TL;DR

This paper explores using highly dispersive filters near atomic resonance in rare earth crystals to achieve time reversal of optical pulses, with potential applications in RF signal processing.

Contribution

It introduces a novel approach combining dispersive filtering and quadratic phase modulation for optical time reversal near atomic resonance.

Findings

High dispersive power achieved near atomic resonance

Demonstration of approximate time reversing scheme

Potential for applications in radio-frequency signal processing

Abstract

Based on the similarity of paraxial diffraction and dispersion mathematical descriptions, the temporal imaging of optical pulses combines linear dispersive filters and quadratic phase modulations operating as time lenses. We consider programming a dispersive filter near atomic resonance in rare earth ion doped crystals, which leads to unprecedented high values of dispersive power. This filter is used in an approximate imaging scheme, combining a single time lens and a single dispersive section and operating as a time reversing device, with potential applications in radio-frequency signal processing. This scheme is closely related to three-pulse photon echo with chirped pulses but the connection with temporal imaging and dispersive filtering emphasizes new features.