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

Parity-time ($\cal PT$) symmetric lasers have attracted considerableattention lately due to their promising applications and intriguing properties,such as free spectral range doubling and single-mode lasing. In this work wediscuss nonlinear modal interactions in these laser systems under steady stateconditions, and we demonstrate that several gain clamping scenarios can occurfor lasing operation in the $\cal PT$-symmetric and $\cal PT$-broken phases. Inparticular, we show that, depending on the system's design and the externalpump profile, its operation in the nonlinear regime falls into two differentcategories: in one the system is frozen in the $\cal PT$ phase space as theapplied gain increases, while in the other the system is pulled towards itsexceptional point. These features are first illustrated by a coupled modeformalism and later verified by employing the Steady-state Ab-initio LaserTheory (SALT). Our findings shine light on the robustness of single-modeoperation in these lasers against saturation nonlinearity in $\calPT$-symmetric lasers.

Nonlinear modal interactions in parity-time (${\cal PT}$) symmetric lasers