CVD ZINC SELENIDE
Zinc selenide is a clear yellow polycrystalline material with a grain size of approximately 70 µm,transmitting in the range 0.5-15µm.It is essentially free of extrinsic impurity absorptions,providing extremely low bulk losses from scatter.Zinc Selenide, produced by the method of chemical vapour deposition, is the preferred material for optics used in high power CO2 laser systems due to its low absorption and high resistance to thermal shock making at 10.6µm.However it is also a popular choice in systems operating at various bands within its wide transmission range.
| Optical Properties | Transmission Range | 0.5-15μm | Mechanical Properties | Young's Modulus | 67.2 GPa (9.75 x 106 psi) |
| Bulk Absorption | <= 0.0005 cm-1@ 10.6µm | Rupture Modulus | 55.1 MPa (8,000 psi) | ||
| Coefficient | Knoop Hardness | 105-120 kg/mm2 | |||
| Temp. Change of | 61 x 10-6/°C@ 10.6µm | Poisson's | 0.28 | ||
| Refractive Index | Ratio | ||||
| Refractive Index | < 3 x 10-6@ 632.8 nm | Physical Properties | Chemical purity | 99.9996% | |
| Non-homogeneity | Grain size | 50 - 70 μm | |||
| Thermal Properties | ThermalConductivity | 0.18 W/cm/°C@ 20° C | Density | 5.27 g/cm3 | |
| Specific Heat | 0.356 J/g/°C | Resistivity | ≈1012(Ωcm） | ||
| Linear Expansion | 7.57 x 10-6/°C@ 20° C | Crystal | cubic | ||
| Coefficient | structure |
Indices of Refraction (n) of CVD ZINC SELENIDE
as a function of wavelength at room temperature (20°C)
Wavelength
n
Wavelength
n
Wavelength
n
Wavelength
n
(μm)
(μm)
(μm)
(μm)
0.54
2.6754
1.80
2.4496
7.40
2.4201
13.00
2.3850
0.58
2.6312
2.20
2.4437
7.80
2.4183
13.40
2.3816
0.62
2.5994
2.60
2.4401
8.20
2.4163
13.80
2.3781
0.66
2.5755
3.00
2.4376
8.60
2.4143
14.20
2.3744
0.70
2.5568
3.40
2.4356
9.00
2.4122
14.60
2.3705
0.74
2.5418
3.80
2.4339
9.40
2.4100
15.00
2.3665
0.78
2.5295
4.20
2.4324
9.80
2.4077
15.40
2.3623
0.82
2.5193
4.60
2.4309
10.20
2.4053
15.80
2.3579
0.86
2.5107
5.0
2.4295
10.60
2.4028
16.20
2.3534
0.90
2.5034
5.40
2.4281
11.00
2.4001
16.60
2.3487
0.94
2.4971
5.80
2.4266
11.40
2.3974
17.00
2.3438
0.98
2.4916
6.20
2.4251
11.80
2.3945
17.80
2.3333
1.00
2.4892
6.60
2.4235
12.20
2.3915
18.20
2.3278
1.40
2.4609
7.00
2.4218
12.60
2.3883
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CVD ZINC SELENIDE TRANSMISSION
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