Journal of Applied Optics, Volume. 42, Issue 5, 790(2021)
Compact large relative aperture long wavelength infrared athermalization optical system with chalcogenide glasses
Figures & Tables(9)
Fig. 1. Structure diagram of long wavelength infrared optical system
Table 1. Optical and thermal properties of common chalcogenide glasses（8 μm～12 μm）
View tableView in ArticleTable 1. Optical and thermal properties of common chalcogenide glasses（8 μm～12 μm）
Material Refractive index at 10 μm Abbe number 8 μm～12 μm dn /dT at 10 μm and 20 ℃ / （10−6/℃） CTE αg / （10−6/℃） IRG202 2.4963 111 61 12.1 IRG204 2.6089 175 47 20.4 IRG205 2.6035 108 66 14.0 IRG206 2.7778 160 30 20.7 Gasir-1 2.4944 120 49.7 17 Gasir-3 2.6105 115 53.0 17 Amtir-1 2.5109 113 70.5 12 Amtir-2 2.6027 110 47.2 13.5
Table 2. Design requirements of optical system
View tableView in ArticleTable 2. Design requirements of optical system
Parameter Value Wavelength/μm 8～12 F# 1 Focal length/mm 12 Distortion/% $ \leqslant $ 5MTF >0.5（on-axis) >0.3（full field@29 lp/mm） Field angle（diagonal）/（°） $ \pm 19$ Detector（uncooled）/pixel 384×288 Temperature/℃ −40～60
Table 3. Structure parameters of optical system
View tableView in ArticleTable 3. Structure parameters of optical system
No. Surf:type Radius/mm Thickness/mm Glass 1 standard 9.02 2.55 IRG206 2 Even asphere 21.65 0.50 3 standard 18.48 1.38 IRG202 4 Even asphere 6.39 5.50 5 standard 28.16 2.29 IRG206 6 standard −40.19 4.50 7 standard Infinity
Table 4. Defocus of different temperatures of system
View tableView in ArticleTable 4. Defocus of different temperatures of system
Temperature/℃ −40 20 60 Defocus/μm 11.3 0 8.1
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Jiyan ZHANG, Haifeng LIN, Zhangchao HUANG. Compact large relative aperture long wavelength infrared athermalization optical system with chalcogenide glasses[J]. Journal of Applied Optics, 2021, 42(5): 790
Paper Information
Category: OE SYSTEM AND ENGINEERING
Received: Jan. 29, 2021
Accepted: --
Published Online: Oct. 26, 2021
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