Three-shell-based lens barrel for the effective athermalization of an IR optical system

Ho Soon Yang, Hagyong Kihm, Il Kweon Moon, Gil Jae Jung, Se Chol Choi, Kyung Joo Lee, Hong Yeon Hwang, Sug Whan Kim, Yun Woo Lee

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


We have developed a new IR optical system that consists of three mirrors and four lenses, and that operates in the temperature range 8°C-32°C. This temperature range can induce thermoelastic deformation in the lenses and their mounting subassembly, leading to a large defocus error associated with the displacement of the lenses inside the barrel. We suggest using a new three-shell-based athermalization structure composed of two materials with different coefficients of thermal expansion (Invar and aluminum). A finite element analysis and the experiment data were used to confirm that this new athermalization barrel had a defocus error sensitivity of 11:6nm=°C; this is an improvement on the widely used conventional single-shell titanium barrel model, which has a defocus error sensitivity of 29:8nm=°C. This paper provides the technical details of the new athermalization design, and its computational and experimental performance results.

Original languageEnglish
Pages (from-to)6206-6213
Number of pages8
JournalApplied Optics
Issue number33
Publication statusPublished - 2011 Nov 20

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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