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http://dx.doi.org/10.3807/KJOP.2017.28.4.153

Analysis of Laser-beam Thermal Effects In an Infrared Camera and Laser Common-path Optical System  

Kim, Sung-Jae (Agency for Defense Development)
Publication Information
Korean Journal of Optics and Photonics / v.28, no.4, 2017 , pp. 153-157 More about this Journal
Abstract
An infrared camera and laser common-path optical system is applied to DIRCM (directional infrared countermeasures), to increase boresighting accuracy and decrease weight. Thermal effects of a laser beam in a common-path optical system are analyzed and evaluated, to predict any degradation in image quality. A laser beam with high energy density is absorbed by and heats the optical components, and then the surface temperature of the optical components increases. The heated optical components of the common-path optical system decrease system transmittance, which can degrade image quality. For analysis, the assumed simulation condition is that the laser is incident for 10 seconds on the mirror (aluminum, silica glass, silicon) and lens (sapphire, zinc selenide, silicon, germanium) materials, and the surface temperature distribution of each material is calculated. The wavelength of the laser beam is $4{\mu}m$ and its output power is 3 W. According to the results of the calculations, the surface temperature of silica glass for the mirror material and sapphire for the lens material is higher than for other materials; the main reason for the temperature increase is the absorption coefficient and thermal conductivity of the material. Consequently, materials for the optical components with high thermal conductivity and low absorption coefficient can reduce the image-quality degradation due to laser-beam thermal effects in an infrared camera and laser common-path optical system.
Keywords
Infrared camera; Laser beam; Thermal analysis; Common path optical system;
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  • Reference
1 A. Swat, "Minimising back reflections from the common path objective in a fundus camera," Proc. SPIE 10151, 101510K (2016).
2 S. T. Yang, M. J. Matthews, S. Elhadj, D. Cooke, G. M. Guss, V. G. Draggoo, and P. J Wegner, "Comparing the use of mid-infrared versus far-infrared lasers for mitigating damage growth on fused silica," Appl. Opt. 49, 2606-2616 (2010).   DOI
3 M. E. Thomas, R. I. Joseph, and W. J. Tropf, "Infrared transmission properties of sapphire, spinel, yttria, and ALON as a function of temperature and frequency," Appl. Opt. 27, 239-245 (1988).   DOI
4 O. Riou, S. Berrebi, and P. Bremond, "Non uniformity correction and thermal drift compensation of thermal infrared camera," Proc. SPIE 5405, 294-302 (2004).
5 J. K. Ji, J. R. Yoon, and K. Cho, "Nonuniformity correction scheme for an infrared camera including the background effect due to camera temperature variation," Opt. Eng. 39, 936-940 (2000).   DOI
6 X. Ma, J. Q. Lu, R. S. Brock, K. M. Jacobs, P. Yang, and X. Hu, "Determination of complex refractive index of polystyrene microspheres from 370 to 1610 nm," Phys. Med. Biol. 48, 4165-4172 (2003).   DOI
7 S. T. Yang, M. J. Matthews, S. Elhadj, D. Cooke, G. M. Guss, V. G. Draggoo, and P. J. Wegner, "Comparing the use of mid-infrared versus far-onfrared lasers for mitigating damage growth on fused silica," Appl. Opt. 49, 2606-2616 (2010).   DOI
8 "Material library," http://www.comsol.com
9 D. Maltese, J. Robineau, J. Audren, J. Aragones, and C. Sailliot, "Countering MANPADS: study of new concepts and applications," Proc. SPIE 6203, 62030G (2006).
10 C. Willers and M. Willers, "Simulating the DIRCM engagement: component and system level performance," Proc. SPIE 8543, 85430M (2012).
11 A. Godard, M. Raybaut, T. Schmid, M. Lefebvre, A. Michel, C. Oudart, S. Teixeira, and M. Pealat, "Development of a compact frequency conversion module for airborne countermeasures," Proc. SPIE 7836, 78360G (2010).
12 H. Bekman, J. Heuvel, F. Putten, and H. Schleijpen, "Development of a mid-infrared laser for study of infrared countermeasures techniques," Proc. SPIE 5615, 27-38 (2004).