Tm:KY1 -x-yGdxLuy(WO4 )2 planar waveguide laser passively Q-switched by single-walled carbon nanotubes

Optics Express
Esrom KifleValentin Petrov

Abstract

A Tm3+ 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:KY1-x-yGdxLuy(WO4)2 active layer grown on an undoped (010)-oriented KY(WO4)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.

References

Jan 26, 2011·Optics Express·Western BolañosFrancesc Díaz
Mar 30, 2011·Optics Express·K van DalfsenM Pollnau
Oct 3, 2012·Optics Letters·Western BolanosPatrice Camy
Jun 16, 2015·Optics Express·Josep Maria SerresFrancesc Díaz
Jul 15, 2016·Applied Optics·R LanV Petrov
Mar 16, 2017·Optics Letters·Esrom KifleFrancesc Díaz

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Citations

May 3, 2018·Optics Express·Benoît BoulangerTakunori Taira
May 6, 2019·Optics Express·Esrom KifleXavier Mateos

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