Diaz Frédéric, Goudail François, Loiseaux Brigitte, Huignard Jean-Pierre
Thales Research & Technology, RD 128, 91767 Palaiseau Cedex, France.
Opt Lett. 2009 Apr 15;34(8):1171-3. doi: 10.1364/ol.34.001171.
Different methods such as axilens and binary-phase filter have been investigated to improve the depth of focus. A method is proposed to calculate an amplitude-phase pupil filter and obtain the desired distribution of intensity along the optical axis. It produces a narrow spot with a uniform intensity level over a large depth of focus, comparable to the performance obtainable with binary-phase filters. This filter is of particular interest for applications where very low intensity fluctuations along the focus range are required.
为了提高聚焦深度，人们研究了诸如轴棱锥和二元相位滤波器等不同方法。本文提出了一种计算振幅-相位光瞳滤波器的方法，并获得沿光轴所需的强度分布。它能产生一个窄光斑，在较大的聚焦深度范围内具有均匀的强度水平，与二元相位滤波器所能达到的性能相当。对于那些要求在聚焦范围内强度波动非常小的应用来说，这种滤波器特别有意义。
