基于Zemax的谱域光学相干层析系统分辨率提高技术研究

Resolution improvement for SD-OCT system based on Zemax

对谱域光学相干层析(SD-OCT)系统中的透镜组进行设计优化,是提高系统成像质量的重要步骤。本文基于Zemax仿真对样品臂中的场镜和光谱仪中的聚焦透镜进行了设计和优化,并且根据点列图、波前图等分析手段对结果进行了像质评价。结果表明,本文设计的场镜可以使系统具有理想的成像质量和良好的横向分辨率;所设计的光谱仪中的聚焦透镜使得聚焦光斑的尺寸小于CCD的像素点宽度,避免了CCD在接收信号时各像元之间造成干扰,从而提高了光谱仪的分辨率。

The design and optimization for lens group in spectral domain optical coherence tomography （SD-OCT） system is fairly important to improve the imaging quality. The field lens in sample arm and the focusing lens in spectrometer are designed based on Zemax, and the imaging quality is evaluated according to spot diagram and wavefront map. The results show that the field lens can provide ideal imaging quality and good lateral resolution. And the focusing lens in the spectrometer makes the size of focal spot smaller than the pixel width of CCD to avoid the interference in each pixel of CCD. In this way, we observe considerable improvement in the resolution of the spectrometer.