Carbon nanotube Q-switched Yb:KLuW surface channel waveguide lasers

Identifier:  imarina:6389754

Handle: https://hdl.handle.net/20.500.11797/imarina6389754

Authors:  Bae, Ji Eun; Park, Tae Gwan; Kifle, Esrom; Mateos, Xavier; Aguilo, Magdalena; Diaz, Francesc; Romero, Carolina; Vazquez de Aldana, Javier Rodriguez; Lee, Hansuek; Rotermund, Fabian

Abstract:
© 2019 Optical Society of America. A channel waveguide (WG) buried immediately below the surface of a Yb:KLuW crystal is used as a laser gain medium for passive Q-switching by both evanescent- and direct-field interactions with single-walled carbon nanotubes (SWCNTs) near 1040 nm. The SWCNTs used as saturable absorbers (SAs) are deposited on top of the half-ring-type channel WG fabricated via femtosecond direct laser writing. The Q-switched WG laser delivers 88.5 ns pulses at a 1.16 MHz repetition rate with a maximum average output power of 680 mW. For the two different interaction schemes with SWCNT-SAs, the pulse characteristics, depending on the output coupling ratio and absorbed pump power, are experimentally investigated and compared to the results of theoretical analyses of the SA Q-switched operation.