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

Junting Liu, Fang Yang, Junpeng Lu (), Shuai Ye, Haowen Guo, Hongkun Nie, Jialin Zhang, Jingliang He, Baitao Zhang () and Zhenhua Ni ()
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Junting Liu: Shandong University
Fang Yang: Southeast University
Junpeng Lu: Southeast University
Shuai Ye: Shandong University
Haowen Guo: Shandong University
Hongkun Nie: Shandong University
Jialin Zhang: Southeast University
Jingliang He: Shandong University
Baitao Zhang: Shandong University
Zhenhua Ni: Southeast University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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 show that defect engineering effectively accelerates the trapping rate and defect-assisted Auger recombination rate of photocarriers. The saturation intensity is improved from 3.6 ± 0.2 to 12.8 ± 0.6 MW cm−2 after the optimized defect regulation. The enhanced saturable absorption and ultrafast carrier lifetime endow the high-performance mode-locked laser with both large output power and short pulse duration.

Date: 2022
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DOI: 10.1038/s41467-022-31606-8

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