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

Identifier:  imarina:3823834

Handle: https://hdl.handle.net/20.500.11797/imarina3823834

Authors:  Kifle, E; Mateos, X; Loiko, P; Choi, SY; Bae, JE; Rotermund, F; Aguiló, M; Diaz, F; Griebner, U; Petrov, V

Abstract:
© 2018 Optical Society of America. 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-y Gd x Lu y (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.