Loss and TM Mode Gain Suppression in Planar Stripe Diode Lasers with Smooth Lateral Profile

概要

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The loss in planar stripe lasers has been calculated in an exact manner. The energy flow balance of the electromagnetic wave is established by a surface integration of the Poynting vector. TM modes are also included whose mode gain is shown to be greatly reduced compared to TE modes. The dependence of the loss coefficient on parameters such as gain width, guiding parameter, absorption coefficient and cavity length were calculated based on a cosh^<-2> (x)-model of the local gain distribution. The loss increases rapidly in the antiguiding regime and is also very sensitive to the gain width. It is pointed out that the loss coefficient depends on the cavity length, especially for short cavities. Hence it is necessary to revise the conventional technique of determining the internal quantum efficiency and loss coefficient. The gain width is used as the primary parameter characterizing lateral waveguiding. In addition, a rough estimate is given to relate the gain width to the actual stripe width.
社団法人応用物理学会の論文
1983-01-20