Page 251 - Chalcogenide Glasses for Infrared Optics

Young’s
Surface
Expansion
Thermal
Thermal Change in ¥ Modulus Hardness Coefficient Upper Use 10 –6 psi Knoop ¥ 10 6 DL/L°C Temp. (°C) ¥ 10 6 D N/Dt°C 19 1150 4 200 +186 15 700 6 100 +427 12 750 6 500 +207 3 45 6 500 +100 11 200 8 500 +46 10 100 9 500 +5

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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