English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The implementation of a superradiant laser as an active frequency standard ispredicted to provide better short-term stability and robustness to thermal andmechanical fluctuations when compared to standard passive optical clocks.However, despite significant recent progress, the experimental realization ofcontinuous wave superradiant lasing still remains an open challenge as itrequires continuous loading, cooling, and pumping of active atoms within anoptical resonator. Here we propose a new scenario for creating continuous gainby using optical forces acting on the states of a two-level atom viabichromatic coherent pumping of a cold atomic gas trapped inside a single-modecavity. Analogous to atomic maser setups, tailored state-dependent forces areused to gather and concentrate excited-state atoms in regions of strongatom-cavity coupling while ground-state atoms are repelled. To facilitatenumerical simulations of a sufficiently large atomic ensemble, we rely on asecond-order cumulant expansion and describe the atomic motion in asemi-classical point-particle approximation subject to position-dependent lightshifts which induce optical gradient forces along the cavity axis. We studyminimal conditions on pump laser intensities and detunings required forcollective superradiant emission. Balancing Doppler cooling and gain-inducedheating we identify a parameter regime of a continuous narrow-band laseroperation close to the bare atomic frequency.

A superradiant two-level laser with intrinsic light force generated gain