|
Indices of Refraction (n) of CVD ZnSe as a
function of wavelength at room temperature
|
| Wavelength (μm) |
Index |
| 0.54 |
2.6754 |
| 0.58 |
2.6312 |
| 0.62 |
2.5994 |
| 0.66 |
2.5755 |
| 0.70 |
2.5568 |
| 0.74 |
2.5418 |
| 0.78 |
2.5295 |
| 0.82 |
2.5193 |
| 0.86 |
2.5107 |
| 0.90 |
2.5034 |
| 0.94 |
2.4971 |
| 1.8 |
2.4496 |
| 2.2 |
2.4437 |
| 2.6 |
2.4401 |
| 3.0 |
2.4376 |
| 3.4 |
2.4356 |
| 3.8 |
2.4339 |
| 4.2 |
2.4324 |
| 4.6 |
2.4309 |
| 5.0 |
2.4295 |
| 5.4 |
2.4281 |
| 5.8 |
2.4266 |
| 7.4 |
2.4201 |
| 7.8 |
2.4183 |
| 8.2 |
2.4163 |
| 8.6 |
2.4143 |
| 9.0 |
2.4122 |
| 9.4 |
2.4100 |
| 9.8 |
2.4077 |
| 10.2 |
2.4053 |
| 10.6 |
2.4028 |
| 11.0 |
2.4001 |
| 11.4 |
2.3974 |
| 13.0 |
2.3850 |
| 13.4 |
2.3816 |
| 13.8 |
2.3781 |
| 14.2 |
2.3744 |
| 14.6 |
2.3705 |
| 15.0 |
2.3665 |
| 15.4 |
2.3623 |
| 15.8 |
2.3579 |
| 16.2 |
2.3534 |
| 16.6 |
2.3487 |
| 17.0 |
2.3448 |
| Optical Properties |
| 10% Transmission Limits |
| (t=6mm) |
0.5–22 μm |
| Index of Refraction Inhomogeneity (Δ n/n) |
| (ppm at 0.6328 μm) |
<3 |
| Thermo-Optic Coefficient, dn/dT (298-358K) |
| (K-1 at 0.6328 μm) |
1.07 x 10-4 |
| (K-1 at 1.15 μm) |
7.0 x 10-5 |
| (K-1 at 3.39 μm) |
6.2 x 10-5 |
(K-1 at 10.6 μm)
|
6.1 x 10-5 |
|
Bulk Absorption Coefficient
|
| (cm-1 at 1.3 μm) |
5.0 x 10-3 |
| (cm-1 at 2.7 μm) |
7.0 x 10-4 |
| (cm-1 at 3.8 μm) |
4.0 x 10-4 |
| (cm-1 at 5.25 μm) |
4.0 x 10-4 |
| (cm-1 at 10.6 μm) |
5.0 x 10-4 |
|
|
Thermo-Optic Coefficient, dn/dT
(10-5K-1) of CVD Zinc Selenide
|
| Temp |
Wavelength (μm) |
| (°C) |
.6328 |
1.15 |
3.39 |
10.6 |
| -180° |
7.6 |
5.4 |
5.0 |
4.9 |
| -160° |
8.2 |
5.7 |
5.2 |
5.1 |
| -140° |
8.7 |
6.0 |
5.4 |
5.4 |
| -120° |
9.1 |
6.3 |
5.6 |
5.5 |
| -100° |
9.4 |
6.5 |
5.8 |
5.7 |
| -80° |
9.7 |
6.6 |
5.9 |
5.8 |
| -60° |
10.0 |
6.7 |
6.0 |
5.9 |
| -40° |
10.2 |
6.8 |
6.1 |
6.0 |
| -20° |
10.3 |
6.9 |
6.1 |
6.0 |
| 0° |
10.5 |
7.0 |
6.2 |
6.1 |
| 20° |
10.6 |
7.0 |
6.2 |
6.1 |
| 40° |
10.7 |
7.0 |
6.2 |
6.1 |
| 60° |
10.8 |
7.1 |
6.3 |
6.1 |
| 80° |
10.9 |
7.1 |
6.3 |
6.2 |
| 100° |
11.0 |
7.2 |
6.3 |
6.2 |
| 120° |
11.1 |
7.2 |
6.4 |
6.3 |
| 140° |
11.3 |
7.3 |
6.4 |
6.3 |
| 160° |
11.5 |
7.4 |
6.5 |
6.4 |
| 180° |
11.8 |
7.6 |
6.6 |
6.6 |
| 200° |
12.1 |
7.8 |
6.7 |
6.7 |
| σa |
0.1 |
0.1 |
0.1 |
0.1 |
| ª Standard deviation from a third degree polynomial fit |
| Physical Properties |
| Crystal Structure: |
cubic |
| Grain Size (diameter): |
50–70 μm |
| Density (g cm-3 at 298k): |
5.27 |
| Resistivity (Ωcm): |
≈1012 |
| Chemical Purity: |
99.9996% |
| Thermal Properties |
| Coefficient of Thermal Expansion |
| (K-1 at 273K) |
7.1 x 10-6 |
| (K-1 at 373K) |
7.8 x 10-6 |
| (K-1 at 473K) |
8.3 x 10-6 |
| Thermal Conductivity |
| (JK-1m-1s-1 at 298K) |
18.0 |
| Heat Capacity |
| (Jg-1K-1 at 289K) |
0.339 |
|
Max operating temperature will depend on environment
|
| Mechanical Properties |
| Hardness |
| Knoop, 50 gm load (kg mm-2) |
110 |
| Vickers, 1kg load (kg mm-2) |
112 |
| Flexural Strength (modulus of rupture) |
| 4 pt. Loading (psi) |
8.0 x 103 |
| 4 pt. Loading (MPa) |
55 |
|
Fracture Toughness
(critical stress intensity factor KIC values)
|
| (MPa√m, Vickers, 100g |
0.5 |
| Young's Modulus (elastic modulus) |
| (psi) |
9.75 x 106 |
| (GPa) |
67.2 |
| Poisson's Ratio |
0.28 |
| Rain erosion resistance will depend on environment |
|
