Abstract
Large-area and highly crystalline transition metal dichalcogenides (TMDs) films possess superior saturable absorption compared to the TMDs nanosheet counterparts, which make them more suitable as excellent saturable absorbers (SA) for ultrafast laser technology. Thus far, the nonlinear optical properties of large-scale WSe2 and its applications in ultrafast photonics have not yet been fully investigated. In this work, the saturable absorption of chemical vapor deposition (CVD) grown WSe2 films with large-scale and high quality are studied and the use of WSe2 films as a broadband SA for passively mode-locked fiber lasers at both 1.5 and 2 μm ranges is demonstrated. To enhance the light-material interaction, large-area WSe2 film is tightly transferred onto the side wall of a microfiber to form a hybrid structure, which realizes strong evanescent wave interaction between light and WSe2 film. The integrated microfiber-WSe2 device shows a large modulation depth of 54.5%. Using the large-area WSe2 as a mode-locker, stable soliton mode-locked pulse generation is achieved and the pulse durations of 477 fs (at 1.5 μm) and 1.18 ps (at 2.0 μm) are demonstrated, which suggests that the large-area and highly crystalline WSe2 films afford an excellent broadband SA for ultrafast photonic applications.
Highlights
Two-dimensional (2D) layered transition metal dichalcogenides (TMDs) have attracted worldwide attentions due to their unique electronic and photonic properties [1,2,3,4]
Recent demonstrations have indicated that the chemical vapor deposition (CVD) grown large-area MoS2 films have shown remakable modulation depth of 35.4% [26], which is over one order of magnitude larger than that of the MoS2 nanosheets [23]
The CVD growth process was presented in details, and material characterizations indicated the high quality of the as-grown large-area WSe2 film
Summary
Two-dimensional (2D) layered transition metal dichalcogenides (TMDs) have attracted worldwide attentions due to their unique electronic and photonic properties [1,2,3,4]. Large-area atomically thin WSe2 films integrated with microfiber structures can offer tight optical confinement for enhancing the light-material interaction, and further provide an ideal platform for studying their nonlinear optical properties and their applications with superior mode-locking performance. In this contribution, large-area atomically thin WSe2 film was grown on a sapphire substrate by a CVD method. We demonstrated the mode-locked thulium-doped fiber (TDF) laser based on WSe2 SA at 2 μm regime
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