石墨烯-碲化铋(Bi2Te3)异质结掺铒光纤脉冲激光器的实验研究
首发时间:2016-06-14
摘要:近年来,石墨烯、过渡金属硫化物、拓扑绝缘体等二维纳米材料在非线性光学领域获得了迅速的应用发展。这些原子厚度的层状材料具有很强的光-物质相互接触和极大的光学非线性,是优秀的饱和吸收材料,可应用于脉冲激光产生领域。目前,由这些材料制备的饱和吸收体都已被证明能够实现典型的调Q激光脉冲输出和锁模激光脉冲输出。但是,如何设计一种可饱和吸收体,具有可调的非线性光学性质,如电子弛豫时间、饱和光学、光调制深度等,以适应自启动、高能量、超短脉宽的脉冲激光器的实际应用,仍然是一个难题。这里,我们报道了一种新型的石墨烯-碲化铋(Bi2Te3)异质结可饱和吸收体。我们通过外延生长的方法,将两种材料堆叠,取得了可调的光学性质。通过调节石墨烯上Bi2Te3的覆盖率,材料的激子动力学和非线性光调制深度都得到调节。随后,我们将该异质结可饱和吸收体整合到1.5微米光纤激光器中,实现了调Q和锁模输出。我们的研究设计了一种新型可调可饱和吸收体,为纳米材料的光学应用提供了一种新思路。
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Graphene?Bi2Te3 Heterostructure based mode-locked fiebr laser
Abstract:Rapid progresses have been achieved in the photonic applications of two-dimensional materials such as graphene, transition metal dichalcogenides and topological insulators. The strong light-matter interactions and large optical nonlinearities in these atomically thin layered materials make them promising saturable absorbers for pulsed laser applications. Either Q-switching or mode-locking pulses with particular output characteristics can be achieved by using different saturable absorbers. However, it remains still very challenging to produce saturable absorbers with tunable optical properties, in particular, carrier dynamics, saturation intensity as well as modulation depth, to suit for self-starting, high energy or ultrafast pulse laser generation. Here we report a new type of saturable absorber which is a van der Waals heterostructure consisting of graphene and Bi2Te3. The synergetic integration of these two materials by epitaxial growth affords tunable optical properties, i.e., both the photocarrier dynamics and nonlinear optical modulation are variable by tuning the coverage of Bi2Te3 on graphene. We further fabricated graphene-Bi2Te3 saturable absorbers and incorporated them into a 1.5 μm fiber laser to demonstrate both Q-switching and mode-locking pulse generation. This work provides a new insight for tailoring two-dimensional heterostructures so as to develop desired photonic applications.
Keywords: heterostructure graphene saturable absorber Q-switching mode-locking
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石墨烯-碲化铋(Bi2Te3)异质结掺铒光纤脉冲激光器的实验研究
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