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
Ultrafast nonlinear optics Nonlinear optics, materials Nonlinear optical materials Mode-locked lasers
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 (MoSe 2 ), these nonlinear optical (NLO) properties of MoSe 2 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 MoSe 2 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 / cm 2 and 234.75 MW / cm 2 , respectively. The excitation carrier recovery time of few-layer MoSe 2 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.