Alignment of the Korsch type off-axis 3 mirror optical system using sensitivity table method

Kyoungmuk Lee, Youngsoo Kim, Jinsuk Hong, Sug Whan Kim, Haeng Bok Lee, Se Chol Choi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The optical system of the entire mechanical and optical components consist of all silicon carbide (SiC) is designed, manufactured and aligned. The Korsch type Cassegrain optical system has 3-mirrors, the primary mirror (M1), the secondary mirror (M2), the folding mirror (FM) and the tertiary mirror (M3). To assemble the M3 and the FM to the rear side of the M1 bench, the optical axis of the M3 is 65.56 mm off from the physical center. Due to the limitation of the mass budget, the M3 is truncated excluding its optical axis. The M2 was assigned to the coma compensator and the M3 the astigmatism respectively as per the result of the sensitivity analysis. Despite of the difficulty of placing these optical components in their initial position within the mechanical tolerance, the initial wave front error (WFE) performance is as large as 171.4 nm RMS. After the initial alignment, the sensitivity table method is used to reach the goal of WFE 63.3 nm RMS in all fields. We finished the alignment with the final WFE performance in all fields are as large as 55.18 nm RMS.

Original languageEnglish
Title of host publicationSensors and Systems for Space Applications XI
EditorsGenshe Chen, Khanh D. Pham
ISBN (Electronic)9781510617933
Publication statusPublished - 2018
EventSensors and Systems for Space Applications XI 2018 - Orlando, United States
Duration: 2018 Apr 162018 Apr 17

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherSensors and Systems for Space Applications XI 2018
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2018 SPIE.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Alignment of the Korsch type off-axis 3 mirror optical system using sensitivity table method'. Together they form a unique fingerprint.

Cite this