Page 252 - Chalcogenide Glasses for Infrared Optics
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Young’s Modulus 10 –6 psi 19 15 12 3 11 10 3 11 50 2
Surface Hardness Knoop 1150 700 750 45 200 100 170 460 1370 40
Thermal Expansion Coefficient ¥ 10 6 DL/L°C 4 6 6 6 8 9 12 0.5 6 58
Upper Use Temp. (°C) 200 100 500 500 500 500 300 500 500 300
Thermal Change in ¥ 10 6 D N/Dt°C +186 +427 +207 +100 +46 +52 +72 +4 10 234
Refractive N at Index mm 10 3.42 4.00 3.34 2.67 2.20 2.38 2.49 1.44 1.73 2.36 A Comparison of the Physical Properties of IR Optical Materials
Trans. Range (mm) 1.2–10 2–12 0.9–12 0.9–30 0.6–10 0.5–12 0.7–12 0.2–3 0.2–4 0.5–40
Material Si Ge GaAs CdTe ZnS ZnSe Amtir 1 (glass) Quartz (glass) Sapphire (Al 2 O 3 ) KRS-5 TABLE 9.3
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