微小孔径激光器的光谱特性综述

Overview of the spectral characteristics of very-small-aperture laser

微小孔径激光器(Very-small-aperture laser,VSAL)是近年发展起来的新型有源纳米激光光源。出射光端面的孔径形状是决定其性能的重要因素之一。多种异形孔径被先后提出并证明能极大地提高VSAL的出射效率。相关研究结果表明,常规孔径形状的通光效率随入射波长的增大急剧下降,但异形孔径的通光效率会出现一个谐振峰,在谐振峰位置通光效率得到了显著的提高。通过改变孔径形状参数或增加表面纳米形貌结构,可以调整纳米孔径本身的谐振波长峰值,改善VSAL的性能。综述了纳米孔径的光谱特性以及利用这种特性优化VSAL的性能,并对未来的研究前景做了适当的展望。

Very-small-aperture laser （VSAL） is a kind of novel active nanometric laser source developed in recent years. Its performances mostly lie on the shape of the emitting aperture perforated on its front facet. Amounts of novel aperture shapes have been proposed and demonstrated to dramatically enhance the output efficiency of VSAL. Related researching results show that the power throughput of common aperture shape decreases rapidly when the incident wavelength is increased. However, in the case of novel aperture shape, there exists a resonant peak, where the power throughput is enhanced remarkably. The position of this peak can be controlled by deforming the aperture shape or adding nanometric surface corrugations around the aperture. The spectral characteristics of nanometric apertures and the corresponding applications on optimizing the performances of VSAL are reviewed. The research prospect is also discussed.