Source data for thermal properties is not very consistent. Temperature values and ranges are not always stated. Different forms (fused, crystalline, cast, pressed) of the same material often have markedly different properties. Data for different materials is frequently from different sources. There is a high potential for units conversion error in the thermal properties.

[1] Element dimensions are generally circular diameters or elliptical major and minor "diameters." Some are circular or square plates with holes in the center.

[2] Heat Capacity values are inconsistent. Source values are erattic (different properties for different forms). I don't know if units or conversions have included errors.

---, property is listed somewhere else in the table

n/a, not applicable

x, not available

(Z), ZEMAX room temperature property

Handbook of Optics (1995) Vol II, Ch 32, Table 18

Smithsonian Physical Tables (1969) 9th Edition

NG = Northrop Grumman Proprietary.

For mirrors before the Field Stop: (S = SSG -like construction); (E = "egg-crate" construction)

V = Visible (0.55 microns) ; S = Short (2 microns); M = Medium (4 microns); L = Long (10 microns)

FPA = Focal Plane Array

PS = Pupil Stop

For Windows and Beam Splitters (B/S), a following line shows that analysis was performed at that wavelength. An "@" symbol shows the wavelength where the window or beam splitter was optimized.