Mezouari Samir, Harvey Andrew R
School of Engineering and Physical Sciences, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK.
Opt Lett. 2003 May 15;28(10):771-3. doi: 10.1364/ol.28.000771.
Radially symmetric pupil plane phase retardation functions are derived that extend focal depth and alleviate third-order spherical aberration (SA) effects. The radial symmetry of these functions means that they can be more conveniently manufactured by use of traditional techniques such as diamond machining than previously reported filters with rectangular symmetry. The method employs minimization of the variation of Strehl ratio with defocus, W20, and SA, W40. The performance of the derived phase filters is illustrated by comparison with standard optical systems and with previously reported phase filters.
推导了径向对称的光瞳平面相位延迟函数，该函数可扩展焦深并减轻三阶球差（SA）效应。这些函数的径向对称性意味着，与先前报道的具有矩形对称性的滤光片相比，利用诸如金刚石加工等传统技术可以更方便地制造它们。该方法采用了使斯特列尔比随离焦量W20和球差W40的变化最小化的方法。通过与标准光学系统以及先前报道的相位滤光片进行比较，说明了所推导相位滤光片的性能。
