Abstract

This paper proposes an analytical calculational technique for a uniform iris with an aperture of elliptical shape. The purpose of the device is to regulate the depth of sharply imaged space. Anamorphic objectives are not suitable for this, because the depth of field is different in the vertical and horizontal directions. The technique is based on an original theory of envelopes, which in this case considers the working face of the leaf of the iris that coincides with a curve that envelops a family of ellipses that open out to a certain angle relative to the fixed pin of the iris leaf.

Variable aperture controlled by microelectrofluidic iris

Jong-hyeon Chang, Kyu-Dong Jung, Eunsung Lee, Minseog Choi, Seungwan Lee, and Woonbae Kim
Opt. Lett. 38(15) 2919-2922 (2013)

A Specifiable Logarithmic High Aperture Iris with 15,000:1 Modulation

Charles A. Morrison
J. Opt. Soc. Am. 42(2) 90-93 (1952)

Transfer Function of an Elliptical Annular Aperture

J. V. Cornacchio
J. Opt. Soc. Am. 57(11) 1325-1330 (1967)

Non-null testing for aspheric surfaces using elliptical sub-aperture stitching technique

Zixin Zhao, Hong Zhao, Feifei Gu, Hubing Du, and Kaixing Li
Opt. Express 22(5) 5512-5521 (2014)

Optical vortex coronagraphy with an elliptical aperture

Garreth J. Ruane and Grover A. Swartzlander
Appl. Opt. 52(2) 171-176 (2013)