Abstract
Present paper deals with study of axial color and thermal defocus of air separated doublet (dialyte lens) made of silicon and germanium in mid-wave infrared (MWIR) band. The axial color and thermal defocus in MWIR with respect to power distribution between elements are studied. The domain of getting a practical solution for a lens having correction of both axial color and thermal defocus is identified. Using this method, design of an example system for a low-format cooled MWIR detector having f/4 with Invar36 as housing material is also discussed and the image quality for different temperature is presented. Results show that the designed optics maintains the high image quality over the temperature range − 20 °C to + 60 °C.
Similar content being viewed by others
References
H. Jamieson, Thermal effects in optical systems. Opt. Eng. 20(2), 156 (1981)
P.J. Rogers, Athermalized FLIR optics. Proc. SPIE 1354, 742 (1990)
L. Rayces, L. Lebich, Thermal compensation of infrared achromatic objectives with three optical materials. Proc. SPIE 1354, 752 (1990)
G. Kurbitz, Automatic active athermalization of infrared optical systems. Proc. SPIE 1540, 612 (1991)
Y. Tamagawa, S. Wakabayashi, T. Tajime, New design method for athermalised optical systems. Proc. SPIE 1752, 232 (1992)
Y. Tamagawa, S. Wakabayashi, T. Tajime, T. Hashimoto, Multilens system design with an athermal chart. Appl. Opt. 33, 8009 (1994)
P.J. Rogers, M. Roberts, Thermal compensation techniques, Chapter 39. Handbook of Optics, vol. 1, 2nd edn., ed. by M. Bass (McGraw-Hill, New York, 1995)
Y. Tamagawa, T. Tajime, Expansion of an athermal chart into a multilens system with thick lenses spaced apart. Opt. Eng. 35, 3001 (1996)
Y. Tamagawa, T. Tajime, Dual-band optical systems with a projective athermal chart: design. Appl. Opt. 36(1), 297 (1997)
A.P. Wood, P.J. Roger, Hybrid optics in dual waveband infrared system. Proc. SPIE 3482, 602 (1998)
Y.-N. Zhang, Z.-Q. Wang, Passively athermalised hybrid Petzval objective for high resolution MWIR detector arrays. Optik 115(4), 169 (2004)
C.W. Kuo, C.L. Lin, C.Y. Han, Dual field-of-view midwave infrared optical design and athermalization analysis. Appl. Opt. 49(19), 3691 (2010)
C.-W. Kuo, Achromatic triplet and athermalized lens assembly for both midwave and longwave infrared spectra. Opt. Eng. 53(2), 021102 (2014)
M.D. Shen et al., Design of midwave infrared athermalization optical system with a large focal plane array. Optik 125, 3085 (2014)
M.D. Shen, Aberration athermal design for infrared search and trace optical system. Optik 125, 3603 (2014)
Y.C. Zhang et al., Mid and long waveband infrared imaging system design. Proc. SPIE 7494, 74940M (2009)
C.W. Kuo, J.M. Miao, C.H. Tai, Midwave infrared optical zooming design and kinoform degrading evaluation methods. Appl. Opt. 50(18), 3043 (2011)
C. Bigwood, A. Wood, Two-element lenses for military application. Opt. Eng. 50(12), 121705 (2011)
R. Kingslake, Lens Design Fundamentals (Academic Press, Cambridge, 1978), pp. 87–91
Acknowledgements
The authors are grateful for the discussion and contribution of their colleagues at optical design group of IRDE and faculty members in the Department of Applied Optics and Photonics, University of Calcutta. Authors would like to thank Director, IRDE, for the permission to publish the work.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Mandal, R., Ghosh, A. Study of silicon–germanium dialyte as athermalized achromat in MWIR band. J Opt 47, 542–546 (2018). https://doi.org/10.1007/s12596-018-0477-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12596-018-0477-7