# Wide-bandwidth, tunable, multiple-pulse-width optical delays using slow light in cesium vapor

## TL;DR

This paper presents a tunable all-optical delay line using slow light in cesium vapor, capable of delaying pulses from hundreds of picoseconds to tens of nanoseconds with minimal distortion.

## Contribution

It introduces a method for dynamically tuning optical delays in cesium vapor with fast reconfiguration, enhancing control over pulse timing in optical systems.

## Key findings

- Delay of 275 ps pulses up to 6.8 ns
- Delay of 740 ps pulses up to 59 ns
- Group index of approximately 200

## Abstract

We demonstrate an all-optical delay line in hot cesium vapor that tunably delays 275 ps input pulses up to 6.8 ns and 740 input ps pulses up to 59 ns (group index of approximately 200) with little pulse distortion. The delay is made tunable with a fast reconfiguration time (hundreds of ns) by optically pumping out of the atomic ground states.