arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.13052physics.opticsquant-ph
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光谱奇异性与二维材料涂层可调谐板条激光器

Spectral singularities and tunable slab lasers with 2D material coating

Hamed Ghaemi-Dizicheh, Ali Mostafazadeh, Mustafa Sarisaman

摘要:

研究了由一对石墨烯或Weyl半金属薄片夹在有源平板激光器中的横电和横磁模式的线性和非线性光谱奇异性。线性光谱奇异性的存在的要求给出了激光阈值条件,而非线性光谱奇异性的存在,由于诱导弱克尔非线性允许计算阈值附近的激光输出强度。石墨烯和Weyl半金属片的存在引入了额外的物理参数,我们可以使用这些参数来调整激光器的输出强度。我们提供了一个全面的研究这种现象和报告的特点,激光在TM模式的板坯外尔半金属涂层。特别是,我们揭示了一个临界角的存在,使得没有激光似乎可能TM模式的平板具有较小的发射角。我们的研究结果表明,TM模式的发射角略超过临界角,激光输出强度变得高度敏感的物理参数的涂层。

英文摘要:

We investigate linear and nonlinear spectral singularities in the transverse electric and transverse magnetic modes of a slab laser consisting of an active planar slab sandwiched between a pair of Graphene or Weyl semimetal thin sheets. The requirement of the presence of linear spectral singularities gives the laser threshold condition while the existence of nonlinear spectral singularities due to an induced weak Kerr nonlinearity allows for computing the laser output intensity in the vicinity of the threshold. The presence of the Graphene and Weyl semimetal sheets introduces additional physical parameters that we can use to tune the output intensity of the laser. We provide a comprehensive study of this phenomenon and report peculiarities of lasing in the TM modes of the slab with Weyl semimetal coatings. In particular, we reveal the existence of a critical angle such that no lasing seems possible for TM modes of the slab with smaller emission angle. Our results suggest that for TM modes with emission angle slightly exceeding the critical angle, the laser output intensity becomes highly sensitive to the physical parameters of the coating.

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