Ahmad H, Reduan S A, Ooi S I, Ismail M A
Appl Opt. 2018 Aug 20;57(24):6937-6942. doi: 10.1364/AO.57.006937.
The rise of 2D materials since the discovery of graphene has been exponential. Their mechanical, electrical and optical properties are exceptional, similar to their 3D counterparts. In this paper, an α-InSe crystal is mechanically exfoliated and transferred directly onto a fiber ferrule to serve as a saturable absorber (SA). A thulium-doped fluoride fiber is used as a gain medium to generate mode-locked pulses together with the InSe-based SA. The SA has a modulation depth of 14.6% and a saturation intensity of 0.4 kW/cm. The passively generated mode-locked pulses have a repetition rate of 6.93 MHz and a pulse width of 5.79 ps. The mode-locked pulses also have a signal-to-noise ratio of 65.4 dB and a time-bandwidth product of 0.36. The pulse energy and peak power are 0.179 nJ and 27.2 W, respectively.
自石墨烯被发现以来，二维材料呈指数级增长。它们的机械、电学和光学性能非常出色，与三维材料类似。在本文中，通过机械剥离将α-InSe晶体直接转移到光纤插芯上，用作可饱和吸收体（SA）。掺铥氟化物光纤用作增益介质，与基于InSe的SA一起产生锁模脉冲。该SA的调制深度为14.6%，饱和强度为0.4 kW/cm。被动产生的锁模脉冲重复频率为6.93 MHz，脉冲宽度为5.79 ps。锁模脉冲的信噪比为65.4 dB，时间带宽积为0.36。脉冲能量和峰值功率分别为0.179 nJ和27.2 W。
