Liu Wenjun, Liu Mengli, OuYang Yuyi, Hou Huanran, Ma Guoli, Lei Ming, Wei Zhiyi
State Key Laboratory of Information Photonics and Optical Communications, School of Science, PO Box 122, Beijing University of Posts and Telecommunications, Beijing 100876, People's Republic of China. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
Nanotechnology. 2018 Apr 27;29(17):174002. doi: 10.1088/1361-6528/aaae40. Epub 2018 Feb 9.
In this paper, a WSe film prepared by chemical vapor deposition (CVD) is transferred onto a tapered fiber, and a WSe saturable absorber (SA) is fabricated. In order to measure the third-order optical nonlinearity of the WSe, the Z-scan technique is applied. The modulation depth of the WSe SA is measured as being 21.89%. Taking advantage of the remarkable nonlinear absorption characteristic of the WSe SA, a mode-locked erbium-doped fiber laser is demonstrated at 1557.4 nm with a bandwidth of 25.8 nm and signal to noise ratio of 96 dB. To the best of our knowledge, the pulse duration of 163.5 fs is confirmed to be the shortest compared with previous mode-locked fiber lasers based on transition-metal dichalcogenides SAs. These results indicate that WSe is a powerful competitor in the application of ultrashort pulse lasers.
在本文中，通过化学气相沉积（CVD）制备的WSe薄膜被转移到锥形光纤上，并制造了WSe可饱和吸收体（SA）。为了测量WSe的三阶光学非线性，应用了Z扫描技术。测得WSe SA的调制深度为21.89%。利用WSe SA显著的非线性吸收特性，在1557.4 nm处演示了锁模掺铒光纤激光器，其带宽为25.8 nm，信噪比为96 dB。据我们所知，与之前基于过渡金属二卤化物SAs的锁模光纤激光器相比，163.5 fs的脉冲持续时间被证实是最短的。这些结果表明，WSe在超短脉冲激光器的应用中是一个有力的竞争者。
