Abstract
We reported on the passively Q-switched waveguide lasers based on few-layer transition metal diselenide, including molybdenum diselenide (MoSe2) and tungsten diselenide (WSe2), as saturable absorbers. The MoSe2 and WSe2 membranes were covered on silica wafers by chemical vapor deposition (CVD). A low-loss depressed cladding waveguide was produced by femtosecond laser writing in a Nd:YAG crystal. Under optical pump at 808 nm, the passive Q-switching of the Nd:YAG waveguide lasing at 1064 nm was achieved, reaching maximum average output power of 115 mW (MoSe2) and 45 mW (WSe2), respectively, which are corresponding to single-pulse energy of 36 nJ and 19 nJ. The repetition rate of the Q-switched waveguide lasers was tunable from 0.995 to 3.334 MHz (MoSe2) and 0.781 to 2.938 MHz (WSe2), and the obtained minimum pulse duration was 80ns (MoSe2) and 52 ns (WSe2), respectively.
Highlights
The two-dimensional (2D) nanomaterials, e.g. graphene and layered analogous to graphene, have received much attentions from the researchers in many areas due to the intriguing electronic and optical features [1,2,3]
Transition metal dichalcogenide (TMDC) possesses excellent properties for generations of photoluminescence, electroluminescence, ultrafast nonlinear absorption, second and third harmonics, which have been widely applied as key components in electronics and photonics [4,5]
In this family of 2D materials, Group VI transition metal (Mo, W and so on) diselenide as well as disulfide are the important members of the TMDCs owing to their direct band gap, with the structure of chalcogen atoms in two hexagonal planes separated by a plane of metal atoms [6]
Summary
The two-dimensional (2D) nanomaterials, e.g. graphene and layered analogous to graphene, have received much attentions from the researchers in many areas due to the intriguing electronic and optical features [1,2,3]. Transition metal dichalcogenide (TMDC) possesses excellent properties for generations of photoluminescence, electroluminescence, ultrafast nonlinear absorption, second and third harmonics, which have been widely applied as key components in electronics and photonics [4,5]. In this family of 2D materials, Group VI transition metal (Mo, W and so on) diselenide as well as disulfide are the important members of the TMDCs owing to their direct band gap, with the structure of chalcogen atoms in two hexagonal planes separated by a plane of metal atoms [6]. This work paves the way on the applications of 2D transition metal diselenides as excellent SAs in integrated waveguide laser platforms
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