《表1 拥有模式扩展层的1.55μm激光器外延层结构》

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《1.55μm AlGaInAs/InP小发散角量子阱激光器的仿真和制备（英文）》

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Figure 10 shows the stability of the far field beam divergence at different injection currents.The laser works under fundamental mode at all level injection currents.The vertical FWHM barely varies with the injection current while the horizontal FWHM increases slightly with the increase of the injection current，which result from the ridge waveguide index changes caused by thermal and carrier injection effects.The aspect ratio ranges from 2.06 to 1.84 vary with the change of injection current and consistently demonstrates better performance as the typical aspect ratio of conventional lasers is about 3.