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在三维激光成像系统中,其性能表现绝大部分决定于器件接收背反射光能幅度的大小,以及耦合器中空间光到光纤纤芯的光耦合效率的高低。为了增加耦合器中激光能量到纤芯内的耦合效率,提出了一种新型非球面透镜到锥形光纤头的耦合器的设计,得到了该耦合器中耦合效率的解析表达式。通过优化耦合透镜的倒相对孔径,对应波长为1 310 nm和1 550 nm的最大耦合效率分别为81.80%and 81.90%,此时的倒相对孔径分别为0.280和0.292。与通常耦合器中的耦合效率相比较,其最大耦合效率没有下降,而相应的倒相对孔径增加较大。另外,还分析了透镜-纤芯对准错位的影响,结果表明,随着对准错位的增加,耦合效率急剧下降。
In the 3D laser imaging system, the performance of the system depends largely on the magnitude of the back-reflected light energy received by the device and the optical coupling efficiency of the spatial light to the fiber core in the coupler. In order to increase the coupling efficiency of the laser energy in the coupler to the fiber core, a new type of aspherical lens-to-tapered coupler was designed and the analytical expression of coupling efficiency was obtained. The maximum coupling efficiencies of 1 310 nm and 1 550 nm for the coupled lens are 81.80% and 81.90%, respectively, by optimizing the inverse aperture of the coupling lens. The inverted relative aperture at this time is 0.280 and 0.292, respectively. Compared with the coupling efficiency in a typical coupler, the maximum coupling efficiency does not decrease, but the corresponding inverted relative aperture increases more. In addition, the effect of lens-core misalignment is analyzed. The results show that the coupling efficiency decreases sharply with the increase of misalignment.