High output mode-locked laser empowered by defect regulation in 2D Bi₂O₂Se saturable absorber.

ABSTRACT: Atomically thin Bi₂O₂Se has emerged as a novel two-dimensional (2D) material with an ultrabroadband nonlinear optical response, high carrier mobility and excellent air stability, showing great potential for the realization of optical modulators. Here, we demonstrate a femtosecond solid-state laser at 1.0 µm with Bi₂O₂Se nanoplates as a saturable absorber (SA). Upon further defect regulation in 2D Bi₂O₂Se, the average power of the mode-locked laser is improved from 421 mW to 665 mW, while the pulse width is decreased from 587 fs to 266 fs. Moderate Ar⁺ plasma treatments are employed to precisely regulate the O and Se defect states in Bi₂O₂Se nanoplates. Nondegenerate pump-probe measurements sh

SUBMITTER: Liu J 

PROVIDER: S-EPMC9256711 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature