Repositori URV

Identificador: imarina:5733831

Handle: https://hdl.handle.net/20.500.11797/imarina5733831

Autors:
Kifle, EsromLoiko, PavelVazquez de Aldana, Javier RodriguezRomero, CarolinaRodenas, AiranZakharov, ViktorVeniaminov, AndreyYu, HaohaiZhang, HuaijinChen, YanxueAguilo, MagdalenaDiaz, FrancescGriebner, UwePetrov, ValentinMateos, Xavier

Resum:
© 2019 Optical Society of America. We report the generation of mid-infrared (~2 µm) high repetition rate (MHz) sub-100 ns pulses in buried thulium-doped monoclinic double tungstate crystalline waveguide lasers using two-dimensional saturable absorber materials, graphene and MoS 2 . The waveguide (propagation losses of ~1 dB/cm) was micro-fabricated by means of ultrafast femtosecond laser writing. In the continuous-wave regime, the waveguide laser generated 247 mW at 1849.6 nm with a slope efficiency of 48.7%. The laser operated at the fundamental transverse mode with a linearly polarized output. With graphene as a saturable absorber, the pulse characteristics were 88 ns / 18 nJ (duration / energy) at a repetition rate of 1.39 MHz. Even shorter pulses of 66 ns were achieved with MoS 2 . Graphene and MoS 2 are therefore promising for high repetition rate nanosecond Q-switched infrared waveguide lasers.