Abstract
The performance of Q-switched erbium doped fiber laser using monolayer molybdenum disulfide (MoS2)-coated planarized optical waveguides with different MoS2 coating lengths is studied in this work. Monolayer MoS2 thin film is integrated onto a planarized optical waveguide using dry transfer technique. As the MoS2 thin film interacts with the evanescent field only, the MoS2-coated planarized waveguide saturable absorber provides advantages in terms of high damage threshold and controllable interaction length between the MoS2 thin film and the light propagating in the waveguide. With a MoS2 coating length of 7.2 mm, the laser shows a widely tunable wavelength range of 38.6 nm. The wavelength tunability of the Q-switched fiber laser reduces to 5.9 nm when the interaction length between light propagating in the waveguide and the MoS2 monolayer is reduced to 2.5 mm. This effect is attributed to the reduction in the number of vacancy states of MoS2 in shorter length coatings. The results obtained contribute valuable information towards the development of all-planar waveguide pulsed laser source.
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