Tapered depressed-cladding waveguide lasers modulated by Ag nanoparticles embedded in SiO2

Shuo Sun; Xiaoli Sun; Feng Ren; Carolina Romero; Javier R. Vázquez de Aldana; Yuechen Jia; Feng Chen

Results in Physics (Nov 2021)

Tapered depressed-cladding waveguide lasers modulated by Ag nanoparticles embedded in SiO2

Shuo Sun,
Xiaoli Sun,
Feng Ren,
Carolina Romero,
Javier R. Vázquez de Aldana,
Yuechen Jia,
Feng Chen

Affiliations

Shuo Sun: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
Xiaoli Sun: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; Corresponding authors.
Feng Ren: Department of Physics, Center for Ion Beam Application and Center for Electron Microscopy, Wuhan University, Wuhan 430072, China
Carolina Romero: Group de investigación en Aplicaciones del Láser y Fotónica, Universidad de Salamanca, PL. La Merced SN, 37008 Salamanca, Spain
Javier R. Vázquez de Aldana: Group de investigación en Aplicaciones del Láser y Fotónica, Universidad de Salamanca, PL. La Merced SN, 37008 Salamanca, Spain; Spanish Center for Pulsed Lasers, M5 Bldg. Science Park, 37185 Villamayor, Salamanca, Spain
Yuechen Jia: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; Corresponding authors.
Feng Chen: School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

Journal volume & issue: Vol. 30
p. 104897

Abstract

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We report on fabrication of tapered circular depressed-cladding waveguides in Nd:YAG crystal by femtosecond laser direct writing (FsLDW). Based on the fabricated waveguides, for the first time to the best of our knowledge, efficient Q-switched mode-locked (QML) lasers are realized by employing silver nanoparticles (NPs) embedded in fused silica as saturable absorber (SA) element. Laser pulses as short as 25 ps with a repetition rate of 7.7 GHz are generated at a wavelength of 1064 nm. We systematically explore the influence of incident-output facet and the reduction factors on guiding properties and laser performance by conducting a comparative study of different tapers, and it has been found that the waveguides with tapered structures can suppress multi-mode guiding while ensure fundamental-mode output for waveguide lasers. Our work paves a new way toward developing three-dimensional (3D) waveguide for applications in on-chip ultrafast laser sources.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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