Open AccessTm:KY1-x-yGdxLuy(WO4)2 planar waveguide laser passively Q-switched by single-walled carbon nanotubes
Author(s) -
Esrom Kifle,
Xavier Mateos,
Pavel Loiko,
Sun Yung Choi,
Jı Eun Bae,
Fabıan Rotermund,
Magdalena Aguiló,
Francesc Dı́az,
Uwe Griebner,
Valentin Petrov
Publication year - 2018
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.004961
Subject(s) - materials science , laser , carbon nanotube , optics , tungstate , waveguide , planar , optoelectronics , substrate (aquarium) , slope efficiency , fiber laser , monoclinic crystal system , q switching , nanotechnology , crystal structure , oceanography , physics , computer graphics (images) , chemistry , geology , computer science , metallurgy , crystallography
A Tm 3+ monoclinic double tungstate planar waveguide laser is passively Q-switched (PQS) by a saturable absorber (SA) based on single-walled carbon nanotubes (SWCNTs) randomly oriented in a polymer film. The laser is based on a 18 µm-thick 5 at.% Tm:KY 1 -x-yGdxLuy(WO 4 ) 2 active layer grown on an undoped (010)-oriented KY(WO 4 ) 2 substrate by liquid phase epitaxy with determined propagation losses 0.7 ± 0.2 dB/cm. The PQS laser generated a maximum average output power of 45.6 mW at 1.8354 µm with a slope efficiency of 22.5%. Stable 83-ns-long laser pulses with an energy of 33 nJ were achieved at a repetition rate of 1.39 MHz. The use of SWCNTs as SA is promising for generation of sub-100 ns pulses in such waveguide lasers at ~2 µm.
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