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首页> 外文期刊>Optical and quantum electronics >An improved model for computing the reflectivity of a AlAs/GaAs based distributed bragg reflector and vertical cavity surface emitting laser
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An improved model for computing the reflectivity of a AlAs/GaAs based distributed bragg reflector and vertical cavity surface emitting laser

机译：计算基于AlAs / GaAs的分布式布拉格反射器和垂直腔面发射激光器的反射率的改进模型

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In this paper, reflectivity of a Distributed Bragg Reflector (DBR) has been computed by considering the effects of changes of wavelength on the changes of the refractive index of the materials of DBR layers. The intrinsic losses of the materials have been included in the computation of the reflectivity of the DBR. It has been found that the effect of change of the wavelength on the refractive index of the DBR materials reduces the Full Width Half Maxima (FWHM) of the stop band significantly which is expected to improve the laser characteristics. If the FWHM is reduced, the thickness of the active layer of a VCSEL can also be reduced which will further reduce the threshold current of the device. It has been found that the intrinsic losses of the materials have a significant effect on the reflectivity of a DBR. It has also been found that peak reflectivity of a 20 pair AlAs/GaAs DBR reduces by 0.2% after including the intrinsic losses (with a value of the intrinsic losses α = 10 cm~(-1)).
机译：本文通过考虑波长变化对DBR层材料折射率变化的影响来计算分布式布拉格反射器（DBR）的反射率。材料的固有损耗已包括在DBR反射率的计算中。已经发现，波长变化对DBR材料的折射率的影响显着降低了阻带的全宽半最大值（FWHM），这有望改善激光特性。如果减小FWHM，则还可以减小VCSEL有源层的厚度，这将进一步减小器件的阈值电流。已经发现，材料的固有损耗对DBR的反射率具有显着影响。还发现，在将固有损耗（固有损耗的值α＝ 10cm 1（-1））包括在内之后，20对AlAs / GaAs DBR的峰值反射率降低了0.2％。

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