提出了基于迈克耳孙干涉仪的扫频线聚焦光学相干层析(OCT)系统的光学设计。在照明系统中引入非球面光束整形透镜组,并利用柱透镜组使光束在样品处实现线聚焦,从而减少系统的扫描维数,达到高速成像的目的。调整非球面整形透镜组的参数以实现高斯光束的整形。在投影系统中,对近红外波段选取不同材料组合以达到消色差目的,完成了两种投影系统的设计,远心光路的结构减小了系统的误差。在Zemax非序列中,将参考臂和样品臂通过分束镜并进行光线追迹,验证了该OCT系统具备干涉能力。结果表明,设计的OCT系统能够实现高速、高品质成像。

An optical design is proposed for the Michelson interferometer based line field-swept source optical coherence tomography (OCT) system. An aspheric lens group for beam shaping is utilized in the illumination system and a cylindrical lens group is used for the line focus of beams, thus the scanning dimension is reduced and the goal of high-speed imaging is realized. The shaping of Gaussian beam is obtained via adjustment of the parameters of the aspheric lens group. In the projection system, the telecentric structure can reduce the system errors, the combination of different materials can be selected to correct chromatic aberration in the near infrared wave band, and the design of two systems is completed. In the Zemax non-sequential mode, the illumination and projection channels are combined by a beam splitter and the ray tracing is done. The interference performance of this OCT system is confirmed. The results show that the designed OCT system can be used for the realization of high-speed and high-quality imaging.