Element Dimensions
[1]
(mm)
Thickness
(mm)
Volume
(cc)
Material Density
(g/cc)
Mass
(kg)
Wave-
length
(micron)
Index
of
Refraction
CTE
(*1E-6/K)
Heat Capacity
[2]
(J/g.K)
Conductivity
(w/m.K)

Element

Scan S

508 x 305

1.5 (See Dwg)

715.5

SiC

3.217

2.302

All

Mirror

---

---

---

Scan S

Primary E 360 5 (See Dwg) 1693 SiC 3.217 5.446 All Mirror 2.1 RB x 171

Primary E

Primary S 360 5 (See Dwg) 936 SiC 3.217 3.011 All Mirror 2.0 HP 1.38 182

Primary S

Secondary S 55 5 (See Dwg) 30.4 SiC 3.217 0.098 All Mirror 2.77 Xtal 0.67 x Secondary S
Tertiary E 240 5 (See Dwg) 765 SiC 3.217 2.461 All Mirror === --- --- Tertiary E
Tertiary S 240 5 (See Dwg) 515 SiC 3.217 1.657 All Mirror === --- --- Tertiary S

Secondary Baffle

Annulus
100 outer
55 inner
2 11 Al 2.7 0.030 All Diffuse
Black
--- --- ---

Secondary Baffle

Field Stop

200 x 50 with
23 hole

2

20

Al

2.7

0.054

All

Mirror

22.9

0.946

189
200-218
235 (200-400K)

Field Stop

Element Dimensions
[1]
(mm)
Thickness
(mm)
Volume
(cc)
Material Density
(g/cc)
Mass
(kg)
Wave-
length
(micron)
Index
of
Refraction
CTE
(*1E-6/K)
Heat Capacity
(J/g.K)
Conductivity
(w/m.K)
Element
B/S VS 96 x 65 4.1 20.1 Germanium 5.38 0.108 All Mirror 5.7 (Z) 0.3230 59.9 (300K) B/S VS
/ML --- --- --- --- --- --- @ 4.0 4.0247 --- --- 74.9 (250K) /ML
PS VS 40 TBD 0 Al 2.7 n/a All Aperture --- --- --- PS VS
Fold Flat 49 x 34 TBD   TBD TBD TBD 0.55 Mirror TBD TBD TBD Fold Flat
Window V 32 5.8 4.7 F Silica 2.2 0.0103 @ 0.55 1.4599 12.38 (Z) 0.740 7.5@250 Window V
S -- -- -- -- -- -- 2.0 1.4381

---

---

---

S
B/S V 34 x 23 2.96 1.8 Germanium 5.38 0.0098 0.55 Mirror 5.7 (Z) --- --- B/S V
S --- --- --- --- --- --- @ 2.0 4.1086 --- --- --- S
Filter V 21 0.762 0.264 Sapphire 3.987 0.0011 0.55 1.7705 6.65 xtal(a) 0.777 46 (300K) Filter V
Filter S -- -- -- -- -- 0.0011 2.0 1.7377 --- --- 58 (250K) Filter S
FPA V

21

See NG

n/a

See NG

n/a

See NG

n/a

n/a

n/a

n/a

n/a

FPA V
FPA S

21

See NG

n/a

See NG

n/a

See NG

n/a

n/a

n/a

n/a

n/a

FPA S
Element Dimensions
[1]
(mm)
Thickness
(mm)
Volume
(cc)
Material Density
(g/cc)
Mass
(kg)
Wave-
length
(micron)
Index
of
Refraction
CTE
(*1E-6/K)
Heat Capacity
(J/g.K)
Conductivity
(w/m.K)
Element
Window M 50 6.4 12.57 Germanium 5.38 0.0676 @ 4.0 4.0247 --- ---

---

Window M
L --- --- --- --- --- --- 10.0 --- --- ---

---

L
PS ML 40 TBD 0 Al   n/a All Aperture --- ---

---

PS ML
B/S M 34x23 3.6 3.6 Germanium 5.38 0.0119 4.0 Mirror 5.7(Z) ---

---

B/S M
L -- -- -- -- -- -- @ 10.0 4.0031 --- ---

---

L
Filter M 21 0.5 0.173 Germanium 5.38 0.00093 4.0 4.0247 --- ---

---

Filter M
Filter L

---

--- --- --- --- 0.00093 10.0 4.0031 --- ---

---

Filter L
FPA M 21 See NG n/a See NG n/a See NG n/a n/a n/a n/a

n/a

FPA M

FPA L

21

See NG

n/a

See NG

n/a

See NG

n/a

n/a

n/a

n/a

n/a

FPA L

Element Dimensions
[1]
(mm)
Thickness
(mm)
Volume
(cc)
Material Density
(g/cc)
Mass
(kg)
Wave-
length
(micron)
Index
of
Refraction
CTE
(*1E-6/K)
Heat Capacity
(J/g.K)
Conductivity
(w/m.K)
Element

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.