Zhang Miao, Ren Zhijun, Yu Ping
Opt Lett. 2019 Jun 15;44(12):3158-3161. doi: 10.1364/OL.44.003158.
We report a technique to break the depth of field (DOF) limit in optical coherence tomography (OCT) using a finite energy Airy beam. The Airy beam is generated using a phase mask in a Fourier transform schematic and provides the DOF improvement due to its low diffraction. We compare Airy beam OCT with conventional Gaussian beam OCT using lateral resolution and sensitivity. Experimental data from the polystyrene beads in water as well as lemon tissue confirm the extension of DOF up to 10 mm in Airy beam OCT, while the DOF of Gaussian beam OCT is less than 3.0 mm. We also demonstrate that a modified Airy beam can be effectively used in OCT by adjusting the truncating factor of the Airy beam via changing the pattern scale of the phase mask. This result provides a selection method for the use of a finite energy Airy beam in OCT.
我们报告了一种使用有限能量艾里光束突破光学相干断层扫描（OCT）景深（DOF）限制的技术。艾里光束通过傅里叶变换原理图中的相位掩模产生，由于其低衍射特性而实现了景深的改善。我们使用横向分辨率和灵敏度将艾里光束OCT与传统高斯光束OCT进行比较。来自水中聚苯乙烯珠以及柠檬组织的实验数据证实，艾里光束OCT的景深可扩展至10毫米，而高斯光束OCT的景深小于3.0毫米。我们还证明，通过改变相位掩模的图案尺度来调整艾里光束的截断因子，改进后的艾里光束可有效地用于OCT。这一结果为在OCT中使用有限能量艾里光束提供了一种选择方法。
