Photonics Research, 2018, 6 (4): 04000314, Published Online: Aug. 1, 2018   

High-quality 2-μm Q-switched pulsed solid-state lasers using spin-coating-coreduction approach synthesized Bi2Te3 topological insulators

Author Affiliations
1 School of Information Science and Engineering, Shandong University, Jinan 250100, China
2 Department of Photonics, Taiwan Sun Yat-sen University, 70 Lienhei Road, Kaohsiung 80424, China
3 State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, China
4 Research Center for Applied Sciences, Academia Sinica, 128 Sec. 2, Academic Road, Taipei 11529, China
5 e-mail: shengzhi_zhao@sdu.edu.cn
6 e-mail: chuckcklee@yahoo.com
Abstract
In this paper, the fabrication process and characterization of Bi2Te3 topological insulators (TIs) synthesized by the spin-coating-coreduction approach (SCCA) is reported. With this approach, high-uniformity nano-crystalline TI saturable absorbers (TISAs) with large-area uniformity and controllable thickness are prepared. By employing these prepared TIs with different thicknesses as SAs in 2-μm solid-state Q-switched lasers, thickness-dependent output powers and pulse durations of the laser pulses are obtained, and the result also exhibits stability and reliability. The shortest pulse duration is as short as 233 ns, and the corresponding clock amplitude jitter is around 2.1%, which is the shortest pulse duration in TISA-based Q-switched 2-μm lasers to the best of our knowledge. Moreover, in comparison with the TISA synthesized by the ultrasound-assisted liquid phase exfoliation (UALPE) method, the experimental results show that lasers with SCCA synthesized TISAs have higher output powers, shorter pulse durations, and higher pulse peak powers. Our work suggests that the SCCA synthesized TISAs could be used as potential SAs in pulsed lasers.

Junpeng Qiao, Shengzhi Zhao, Kejian Yang, Wei-Heng Song, Wenchao Qiao, Chung-Lung Wu, Jia Zhao, Guiqiu Li, Dechun Li, Tao Li, Hong Liu, Chao-Kuei Lee. High-quality 2-μm Q-switched pulsed solid-state lasers using spin-coating-coreduction approach synthesized Bi2Te3 topological insulators[J]. Photonics Research, 2018, 6(4): 04000314.

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