Wenjun Liu, Mengli Liu, Hainian Han, Shaobo Fang, Hao Teng, Ming Lei, Zhiyi Wei, "Nonlinear optical properties of WSe2 and MoSe2 films and their applications in passively Q-switched erbium doped fiber lasers," Photonics Res. 6, C15 (2018)

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- Photonics Research
- Vol. 6, Issue 10, C15 (2018)

Fig. 1. (a) AFM overview of WSe 2 . (b) Function curve of height and lateral distance of the WSe 2 SA. (c) TEM detail image of the WSe 2 SA at scale bar length of 10 nm. (d) AFM image of MoSe 2 . (e) Function curve of height and lateral distance of the MoSe 2 SA. (f) TEM detail image of the MoSe 2 SA at high resolution of 10 nm.

Fig. 2. (a) Absorption spectrum of WSe 2 . (b) Absorption spectrum of MoSe 2 .

Fig. 3. (a) Effective coverage area of WSe 2 material in the case of no light passing. (b) The light passing through the effective area of material.

Fig. 4. (a) Raman spectrum of the WSe 2 SA. (b) Raman spectrum of the MoSe 2 SA. (c) Non-linear saturable absorption of the WSe 2 SA. (d) Non-linear saturable absorption of the MoSe 2 SA.

Fig. 5. (a) and (b) are the XPS profiles of WSe 2 . (c) and (d) are the XPS profiles of MoSe 2 .

Fig. 6. Schematic diagram of the passively Q -switched pulse fiber laser on the basis of WSe 2 and MoSe 2 SAs. Pump is the laser diode with a center wavelength of 976 nm; WDM is the wavelength division multiplexer; WSe 2 / MoSe 2 SA is the saturable absorber; EDF is the erbium-doped gain fiber; PI-ISO is the polarization independent isolator; PC is the polarization controller; OC is the optical coupler.

Fig. 7. Experimental results of passively Q -switched pulse fiber laser based on the WSe 2 SA. (a) Pulse trains at different power levels. (b) Single pulse sequence at maximum pump power of 680 mW. (c) Optical spectrum. (d) RF spectrum at 300 Hz RBW.

Fig. 8. (a) The trend of repetition and duration as the pump power is boosted. (b) Output power and pulse energy under variable power.

Fig. 9. Experimental results of Q -switched fiber laser based on the MoSe 2 SA. (a) Pulse trains at different power levels. (b) Single pulse sequence at maximum pump power of 680 mW. (c) Optical spectrum. (d) RF spectrum.

Fig. 10. (a) Trends of repetition and duration as the pump power is boosted. (b) Output power and pulse energy under variable power.
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Table 1. Performance Comparison of the Passively Q -Switched Fiber Laser Based on the WSe 2 SAa
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Table 2. Performance Comparison of the Passively Q -Switched Fiber Laser Based on the MoSe 2 SA
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Table 3. Performance Comparison with MoS 2 -Based Q -Switched Fiber Lasers

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