Mode Selection and Single-mode Lasing by Active Transformation Optics

TL;DR

This paper introduces a method using active transformation optics to selectively excite specific lasing modes by controlling modal interactions through the spatial pump profile, especially in complex overlapping mode scenarios.

Contribution

It presents a novel systematic approach linking nonlinear and linear dielectric constants to achieve mode selection in lasers.

Findings

Effective mode selection in complex lasing systems.

Enhanced control over lasing modes via pump profile manipulation.

Potential for improved laser performance in overlapping mode regimes.

Abstract

Using the correspondence between (saturated) nonlinear and (unsaturated) linear dielectric constants, we propose a simple and systematic method to achieve selective excitation of lasing modes that would have been dwarfed by more dominant ones of lower thresholds. The key element of this method is incorporating the control of modal interactions into the spatial pump profile, and it is most valuable in the presence of spatially and spectrally overlapping modes, where it would be difficult to achieve selective excitation otherwise.