Enhanced nonlinear optical response of layered WSe1.4Te0.6 alloy in 1 μm passively Q-switched laser
1 College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
2 School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
Figures & Tables
Fig. 1. (a) Synthesis scheme of bulk crystals by CVT with dual-temperature zones. Photographs and atomic models of the formation of 2H . Photographs and atomic models of layer-structure bulks of (b) 2H and (c) Td . TEM and SEAD characterizations of few-layer nanosheets of (d) , (e) , and (f) . Corresponding full EDS scanning of (g) , (h) , and (i) . AFM images and thickness measurements of typical nanosheets of (j) , (k) , and (l) .
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Fig. 2. (a) Raman spectra of few-layer , , and nanosheets. (b) Comparison of recorded transmittance spectra and corresponding fitted lines. (c) The refractive index of , , and based on the relationship of Kramers–Kronig.
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Fig. 3. (a) Determination of the Tauc optical gap. The spectral dependence of on . (b) The open-aperture Z-scan results of , , and nanoflakes.
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Fig. 4. Experimental setup of the LD pumped passively -switched laser.
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Fig. 5. (a) Output power with increasing incident pump powers. (b) Variations of pulse repetition rates and pulse duration with increasing pump powers. (c) Typical temporal pulse trains of -switched lasers. (d) Single pulse traces.
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Fig. 6. Optical spectrum of a -switched laser.
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Table1. Results of Z-scan Measurements at 1070 nm
Sample | | NL(104 cm/GW) | | | Is(GW/cm2) | As(%) |
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| 23 | | | 25.41 | 0.53 | 3 | | 24 | | | 25.73 | 0.08 | 7.8 | | 12 | | | 5.97 | 4.43 | 2.2 |
|
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Table2. Parameters of WSexTe2−x Saturable Absorbers Based Q-switched Lasers
Parameter | | | |
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Pulse duration (ns) | 1220 | 776 | 556 | Repetition frequency (kHz) | 117.1 | 172.1 | 164 | Average power (mW) | 30.3 | 50.2 | 82.3 |
|
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Zhengting Du, Tianqi Zhang, Zhenda Xie, Jian Ning, Xinjie Lü, Jinlong Xu, Shining Zhu. Enhanced nonlinear optical response of layered WSe1.4Te0.6 alloy in 1 μm passively Q-switched laser[J]. Chinese Optics Letters, 2019, 17(12): 121404.