Using electric fields for pulse compression and group velocity control

TL;DR

This paper demonstrates a novel method to control optical pulse group velocity and compression using electric fields in rare-earth-ion-doped crystals, with potential applications in quantum information processing.

Contribution

It introduces an experimental technique combining spectral hole burning, slow light, and Stark effect for continuous group velocity control and pulse compression.

Findings

Group velocity can be tuned by a factor of 20 without pulse distortion.

Pulse compression is achievable using the same technique.

External voltages enable precise control of pulse reshaping.

Abstract

In this article, we experimentally demonstrate a new way of controlling the group velocity of an optical pulse by using a combination of spectral hole burning, slow light effect and linear Stark effect in a rare-earth-ion-doped crystal. The group velocity can be changed continuously by a factor of 20 without significant pulse distortion or absorption of the pulse energy. With a similar technique, an optical pulse can also be compressed in time. Theoretical simulations were developed to simulate the group velocity control and the pulse compression processes. The group velocity as well as the pulse reshaping are solely controlled by external voltages which makes it promising in quantum information and quantum communication processes. It is also proposed that the group velocity can be changed even more in an Er doped crystal while at the same time having a transmission band matching the telecommunication wavelength.