Resonant sequential scattering in two-frequency-pumping superradiance from a Bose-Einstein condensate

TL;DR

This paper investigates how two-frequency laser pumping influences sequential superradiant scattering in a Bose-Einstein condensate, revealing new atomic distribution patterns and the importance of mode frequency overlap.

Contribution

It demonstrates the impact of pump frequency difference on atomic mode patterns and introduces a novel distribution at eight times the recoil frequency, supported by a semiclassical model.

Findings

Distinct atomic side mode patterns for different frequency differences

Observation of a novel distribution at eight times the recoil frequency

Mode overlap critically affects superradiant scattering dynamics

Abstract

We study sequential scattering in superradiance from a Bose-Einstein condensate pumped by a two-frequency laser beam. We find that the distribution of atomic side modes presents highly different patterns for various frequency difference between the two pump components. A novel distribution is observed, with a frequency difference of eight times the recoil frequency. These observations reveal that the frequency overlap between the end-fire modes related to different side modes plays an essential role in the dynamics of sequential superradiant scattering. The numerical results from a semiclassical model qualitatively agree with our observations.