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多横模垂直腔面发射激光器及其波长特性?
Multi-transverse-mo de and wavelength split characteristics of vertical cavity surface emitting laser
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摘要: 基于氧化限制型内腔接触垂直腔面发射激光器(VCSEL)结构设计，研究了VCSEL的多横模分布及其模式波长分裂特性与氧化孔径尺寸、形状的关系.在实验基础上，通过建立有效折射率模型，并利用标量亥姆霍兹方程的迭代算法理论，分别对椭圆形氧化孔径和圆形氧化孔径VCSEL的横向模式特性进行模拟研究，计算得到不同形状孔径的多横模光场分布情况，同时测量得到高阶横模多频输出光谱.研究发现，椭圆氧化孔形状不仅影响横模分布特性，还会导致每个模式的波长产生分裂，分裂值可达0.037 nm.同时，随着氧化孔径的增大，波长分裂影响会逐渐减小，直至趋近于圆形氧化孔径的分布特性.研究结果为进一步实现氧化限制型VCSEL的多横模锁定提供了有益参考和借鉴.Abstract: We study the multi-transverse mode distributions and the wavelength splittings with different designed oxide aper-tures of the oxide-confined VCSEL. By developing the effective index model and BPM algorithm theory, the charac-teristics of transverse optical field distribution are calculated with circular aperture and ellipsoid aperture, which are compared with our experimental results of multi-wavelength spectra of high-order transverse modes. The results show that the orthogonality of the different crystal orientation modes will be broken by the oxidation-induced ellipsoid aper-ture, and the maximum wavelength spltting of the degenerated high-order mode is 0.037 nm, which can be reduced as the diameter of aperture increases. The results in this paper will provide a useful reference for multi-transverse mode locking of oxide-confined VCSELs.
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