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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The realization of high-$\beta$ lasers is one of the prime applications ofcavity-QED promising ultra-low thresholds, integrability and reduced powerconsumption in the field of \textit{green photonics}. In such nanolasersspontaneous emission can play a central role even above the threshold. By goingbeyond rate-equation approaches, we revisit the definition of a laser thresholdin terms of the input-output characteristics and the degree of coherence of theemission. We demonstrate that there are new regimes of cavity-QED lasing,realized e.g. in high-$Q$ nanolasers with extended gain material, for which thetwo can differ significantly such that coherence is reached at much higher pumppowers than required to observe the thresholdlike intensity jump. Against thecommon perception, such devices do not benefit from high-$\beta$ factors interms of power reduction, as a significant amount of stimulated emission isrequired to quieten the spontaneous emission noise.

Delayed transition to coherent emission in nanolasers with extended gain media