Based on the facts that transparent devices required excellent optical properties, an approach was proposed for controlling devices' optical properties by investigating and controlling the relative refractive index. Taking the microinjection molded thin optical lens as an example,the wave-front of a parallel laser light source coming through the optical devices was measured and reconstructed. Then the theoretical relationship between the reconstructed wavefront and the relative refractive index was analyzed and deduced, and the relative refractive index distributions of the optical lenses were calculated. At last,the packing time's effects in microinjection molding on the relative refractive index distribution were investigated. The experimental results show that as the packing time increases from 1s to 3s,the relative refractive index distribution inside the lenses is more uniform,and the range of the refractive index decreases from 6. 1×10-3 to 2. 9×10-3. The proposed characterization method with respect to relative refractive index is effective for controlling the optical devices' properties.%针对透明器件对光学性能要求很高的现实,提出通过调控相对折射率来实现光学性能调控的方法.以微注塑薄壁透镜为例,对平行激光光源通过光学透镜后的波阵面进行检测与重建；接着推导出了波阵面检测结果与相对折射率的理论关系,并计算了透镜内部相对折射率的分布；最后考查了微注塑过程中保压时间对透镜相对折射率分布的影响.实验结果表明:当微注塑保压时间从1s延长至3s时,相对折射率分布均匀度明显提高,折射率的极差从6.1×10-3减小到2.9×10-3.该相对折射率表征方法能有效调控光学制品性能.
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