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Proceedings Paper

Optical design, performance, and tolerancing of an Offner imaging spectrograph
Author(s): Hana Ku; Seo Hyun Kim; Hong Jin Kong; Jun Ho Lee
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Paper Abstract

We introduce a design of an Offner imaging spectrograph with its performance and tolerancing results. It is a traditional Offner spectrograph employing two concave mirrors and one convex reflective grating for dispersing light in the SWIR band (900~1700 nm). The optical system uses 25um-pitch pixels for the detector and the goal spectral sampling is 3.2nm. Its performance is analyzed in terms of MTFs, spot diagrams, and distortions – keystone and smile. This design focuses on the yaw(beta-tilt) sensitivity of the tertiary mirror as the compensator hence is expected to act as a performance-improving breakthrough for the entire system as the inverse sensitivity confirms it is the most sensitive component. The procedure of the inverse sensitivity evaluation is explained, and then budgeting the tolerances for each element for the practical production is described.

Paper Details

Date Published: 15 October 2012
PDF: 8 pages
Proc. SPIE 8491, Optical System Alignment, Tolerancing, and Verification VI, 84910K (15 October 2012); doi: 10.1117/12.929483
Show Author Affiliations
Hana Ku, KAIST (Korea, Republic of)
Seo Hyun Kim, KAIST (Korea, Republic of)
Hong Jin Kong, KAIST (Korea, Republic of)
Jun Ho Lee, Kongju National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8491:
Optical System Alignment, Tolerancing, and Verification VI
José Sasián; Richard N. Youngworth, Editor(s)

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