Sphere-cone-polynomial special window with good aberration characteristic

doi:10.1088/1674-1056/22/7/074212

Abstract Optical windows with external surfaces shaped to satisfy operational environment needs are known as special windows. A novel special window, sphere-cone-polynomial (SCP) window, is proposed. The formulas of this window shape are given. An SCP MgF₂ window with a fineness ratio of 1.33 is designed as an example. The field-of-regard (FOR) angle is ±75°. From the window system simulation results obtained with the calculated fluid dynamics (CFD) and optical design software, we find that compared to the conventional window forms, the SCP shape can not only introduce relatively less drag in the airflow, but also have the minimal effect on imaging. So the SCP window optical system can achieve a high image quality across a super wide FOR without adding extra aberration correctors. The tolerance analysis results show that the optical performance can be maintained with a reasonable fabricating tolerance to manufacturing errors.

Keywords: special optical window sphere-cone-polynomial surface aberration characteristic

Received: 20 December 2012
Revised: 15 January 2013
Accepted manuscript online:

PACS:	42.79.-e	(Optical elements, devices, and systems)
	42.15.Eq	(Optical system design)
	42.15.Fr	(Aberrations)

Fund: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 61007009).

Corresponding Authors: Wang Chao
E-mail: Nicklo19992009@163.com

Cite this article:

Wang Chao (王超), Zhang Xin (张新), Qu He-meng (曲贺盟), Wang Ling-jie (王灵杰), Wang Yu (王钰) Sphere-cone-polynomial special window with good aberration characteristic 2013 Chin. Phys. B 22 074212

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