Photonics Research, 2018, 6 (7): 07000674, Published Online: Jul. 4, 2018  

Nonlinear optical performance of few-layer molybdenum diselenide as a slow-saturable absorber Download: 685次

Author Affiliations
1 Shenzhen Key Laboratory of Advanced Thin Films and Applications, College of Physics and Energy, Shenzhen University, Shenzhen 518060, China
2 School of Physics and the Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland
3 Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
4 e-mail: wangkangpeng@msn.com
5 e-mail: luojt@szu.edu.cn
Abstract
Two-dimensional transition metal dichalcogenides are considered promising materials for next-generation photonics and nano-optical devices. Although many previous reports have shown saturable absorption of molybdenum diselenide (MoSe2), these nonlinear optical (NLO) properties of MoSe2 were measured in separate works and under different conditions with their hot-carrier relaxations. Here, we conducted a series of coherent studies on the NLO properties of few-layer MoSe2 via open-aperture Z-scan and degenerate pump-probe techniques. These measurements were taken to test the materials’ capabilities as a slow-saturable absorber. A slow-absorber model was employed to analyze the NLO measurements, and the results show that the NLO modulation depth was modeled to be 7.4% and 15.1% for the linear absorption coefficients of 5.22 cm 1 and 6.51 cm 1, respectively. The corresponding saturated intensities were modeled to be 39.37 MW/cm2 and 234.75 MW/cm2, respectively. The excitation carrier recovery time of few-layer MoSe2 was measured by degenerate pump-probe techniques to be 220 ps. These nonlinear optical performances make it a promising slow-saturable absorber for passive mode locking in femtosecond lasers.

Gaozhong Wang, Guangxing Liang, Aidan A. Baker-Murray, Kangpeng Wang, Jing Jing Wang, Xiaoyan Zhang, Daniel Bennett, Jing-Ting Luo, Jun Wang, Ping Fan, Werner J. Blau. Nonlinear optical performance of few-layer molybdenum diselenide as a slow-saturable absorber[J]. Photonics Research, 2018, 6(7): 07000674.

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