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Optical Design of an Off-Axial-Field Two-Mirror System with a Displaced Stop and a Secondary Mirror

조리개와 제 2거울이 횡이동된 비축시야 2반사 광학계 설계

Ji-Woo Nam1
,
Jong-Ung Lee1†
남 지우1
,
이 종웅1†
1Department of Laser and Optical Information Engineering, Cheongju University
1청주대학교 레이저광정보공학과
*julee@cju.ac.kr
25 December 2020. pp. 304-313
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Abstract

조리개가 제 2거울에 있는 inverse Cassegrain 광학계에서 비축시야를 사용하면, 이 2반사경계는 넓은 시야를 가지는 대물광학계로 사용할 수 있다. 하지만 이 전통적인 회전대칭 구조의 반사경계는 설계변수의 수가 너무 적기 때문에 수차보정에 한계가 있다. 이 연구에서는 조리개와 제 2거울을 별도로 횡이동시켜 성능을 개선한 새로운 2반사 광학계를 설계하였다. 새로운 설계변수를 사용하여 5차 코마와 비점수차에 대한 보정이 개선되었으며, 시야 전체에서 보다 좋은 수차균형을 얻을 수 있었다. 새로 설계된 비축시야 2반사경계는 회전대칭 구조의 통상적인 2반사경계와 비교하여 spot의 크기가 1/2 수준으로 줄어들었으며, 개선의 효과가 시야 전체에 고르게 나타나고 있다.

키워드
Optical system design
Two-mirror system
Off-axial field
Decentered system

By using an off-axial field with an inverse Cassegrain system where the aperture stop is at the secondary mirror, the two-mirror system can be used for a wide-field objective. However, aberration corrections in conventional two-mirror systems are limited because the design parameters are too small. In this study, we present a new improved design of the off-axial-field two-mirror system. The new design has an independently displaced aperture stop and a secondary mirror. The new design parameters yield more improvement in correction for 5th-order coma and astigmatism, and better aberration balancing for the whole off-axial field. The spot sizes of the new design system are reduced to half of those for a conventional reference design, and the improvement effects are shown for the whole field evenly.

Keywords
광학 시스템 설계
2반사 광학계
비축시야
편심
References
1
S. H. Kim, H. J. Kong, J. U. Lee, J. H. Lee, and J. H. Lee, "Design and construction of an Offner spectrometer based on geometrical analysis of ring fields," Rev. Sci. Instrum. 85, 083108 (2014). 10.1063/1.489247925173247
2
J. U. Lee and S.-M. Yu, "Analytic design procedure of three-mirror telescope corrected for spherical aberration, coma, astigmatism, and Petzval field curvature," J. Opt. Soc. Korea 13, 184-192 (2009). 10.3807/JOSK.2009.13.2.184
3
I. Moon, S. Lee, J. Lim, H.-S. Yang, H.-G. Rhee, J. B. Song, Y. W. Lee, J. U. Lee, and H. Jin, "Design and development of a wide field telescope," Proc. SPIE 8444, 844448 (2012). 10.1117/12.926647
4
J. U. Lee, Y. Kim, S. H. Kim, Y. Kim, and H. Kim, "Optical design of an image-space telecentric two-mirror system for wide-field line imaging," Curr. Opt. Photon 1, 344-350 (2017).
5
G. I. Lebedeva and A. A. Garbul, "Prospective aerospace reflective objectives," J. Opt. Technol. 61, 610-614 (1994).
6
H.-J. Oh and J.-U. Lee, "Optical design of a wide-field off-axis two-mirror system without ray obstruction," Korean J. Opt. Photon. 28, 263-272 (2017).
7
S. Rosin, "Inverse Cassegrainian systems," Appl. Opt. 7, 1483-1497 (1968). 10.1364/AO.7.00148320068828
8
W. B. Wetherell and M. P. Rimmer, "General analysis of aplanatic Cassegrain, Gregorian, and Schwarzschild telescopes," Appl. Opt. 11, 2817-2832 (1972). 10.1364/AO.11.00281720119413
9
C. L. Wyman and D. Korsch, "Aplanatic two-mirror telescopes; a systematic study. 3: the Schwarzschild-Couder configuration," Appl. Opt. 14, 992-995 (1975). 10.1364/AO.14.00099220135010
10
H. Gross, F. Blechinger, and B. Achtner, Handbook of Optical Systems: Survey of Optical Instruments: Survey of Optical Instruments (Wiley-VCH, Weinheim, Germany, 2008), Vol. 4, Chapter 43. 10.1002/9783527699247
11
J. U. Lee, "Aberration correction of an off-axial field two-mirror system using a decentered aperture," Korean J. Opt. Photon. 31, 20-25 (2020).
12
J. Sasian, Introduction to Aberrations in Optical Imaging Systems (Cambridge University Press, Cambridge, UK, 2013).
13
W. T. Welford, Aberrations of Optical System (Taylor & Francis Group, NY, USA, 1986).
Information
  • Publisher :Optical Society of Korea
  • Publisher(Ko) :한국광학회
  • Journal Title :Korean Journal of Optics and Photonics
  • Journal Title(Ko) :한국광학회지
  • Volume : 31
  • No :6
  • Pages :304-313
  • Received Date :2020. 09. 14
  • Revised Date :2020. 10. 11
  • Accepted Date : 2020. 10. 12
  • DOI :https://doi.org/10.3807/KJOP.2020.31.6.304
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