Abstract
The performance of Q-switched erbium doped fiber laser using monolayer molybdenum disulfide (MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> )-coated planarized optical waveguides with different MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> coating lengths is studied in this work. Monolayer MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> thin film is integrated onto a planarized optical waveguide using dry transfer technique. As the MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> thin film interacts with the evanescent field only, the MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -coated planarized waveguide saturable absorber provides advantages in terms of high damage threshold and controllable interaction length between the MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> thin film and the light propagating in the waveguide. With a MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> 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 MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> monolayer is reduced to 2.5 mm. This effect is attributed to the reduction in the number of vacancy states of MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> in shorter length coatings. The results obtained contribute valuable information towards the development of all-planar waveguide pulsed laser source.
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