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利用光学软件GLAD的数值仿真技术设计了用于光学相干层析技术成像的基于梯度折射率(GRIN)镜头的小型化探头。首先,简述了梯度折射率镜头的基本特性,讨论了基于梯度折射率镜头的光学探头的设计方法;然后,对由单模光纤、玻璃棒隔片和梯度折射率镜头构成的探头模型进行了仿真。结果显示,利用GLAD的数值仿真技术为小型化探头的设计及其光学性能的验证提供了一种直观而有效的方法。另外,玻璃棒隔片存在一个适当的长度范围,可以改善设计的光学探头的传光性能。在所给仿真条件下,如设定梯度折射率镜头长0.1mm、玻璃棒隔片长度为0.8～1.1mm,则探头的工作距离将超过1.0mm,而聚焦光斑的尺寸<40μm。
The miniaturized probe based on Gradient Refractive Index (GRIN) lens for optical coherence tomography imaging was designed using the numerical simulation technology of optical software GLAD. Firstly, the basic characteristics of gradient index lens are briefly introduced. The design method of optical probe based on gradient index lens is discussed. Then, the probe model consisting of single mode fiber, glass rod spacer and gradient index lens simulation. The results show that using GLAD numerical simulation technology provides an intuitive and effective method for the design of miniaturized probe and the verification of its optical performance. In addition, the glass rod septa have an appropriate length range to improve the light transmission properties of the designed optical probe. Under given simulation conditions, if the gradient index lens is set to 0.1 mm in length and the length of the glass rod spacer is 0.8 to 1.1 mm, the working distance of the probe will exceed 1.0 mm and the focal spot size <40 μm.