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Optical Materials / Zinc Selenide (ZnSe) |
Zinc Selenide (ZnSe) |
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ZnSe is a preferred material for lenses, windows, output couplers and beam expanders for its low absorptivity at infrared wavelengths and its visible transmission. For high-power applications, it's critical that the material bulk absorption and internal defect structure be carefully controlled, that minimum-damage polishing technology be employed, and the highest quality optical thin-film coatings are used. The material absorption is verified by CO2 laser vacuum calorimetry. Our quality assurance department provides testing and specific optics certification on request. ZnSe optics are routinely polished from 5 to 300 mm in diameter. Sizes in 300 mm diameter and 25 mm thick are manufactured to customer requirements.
ZnSe is non-hygroscopic and chemically stable, unless treated with strong acids. It's safe to use in most industrial, field, and laboratory environments.
Prism-Grade Zinc Selenide
Zinc Selenide (ZnSe) Prism Grade
II-VI Infrared has the capability to grow prism grade ZnSe up to 2.50” thick. Prism grade ZnSe exhibits minimal refractive index variations within the material on planes perpendicular to the growth direction as well as in other directions. Index variations will test to less than 3 ppm at 0.6328 microns regardless of orientation. Prism grade ZnSe is commonly used in thermal imaging systems. Call our technical sales staff to discuss your specific requirements for material greater than 2.50” thick.
- Refractive index variation less than 3 ppm @0.6328µm in all directions
- Consistent optical performance independent of orientation
- Thickness to 2.50"
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ZnSe Transmission Charts Thermo-Optic Coefficient @ Various Wavelengths
dn/dT (10-5°C-1) |
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aStandard deviation from a third degree polynomial fit
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A.Feldman et al, “Optical Materials Characterization Final Technical Report Feb. 1, 1978 - Sept. 30, 1978,” National Bureau of Standards Technical Note 933, Pages 53 and 54. |
Material Properties
| Optical Properties |
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| Bulk Absorption Coefficient @ 10.6µm |
<= 0.0005 cm-1
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| Temperature Change of Refractive Index @ 10.6µm |
61 x 10-6/°C
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| Refractive Index Inhomogeneity @ 632.8 nm |
< 3 x 10-6
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| Thermal Properties |
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| Thermal Conductivity @ 20° C |
0.18 W/cm/°C
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| Specific Heat |
0.356 J/g/°C
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| Linear Expansion Coefficient @ 20° C |
7.57 x 10-6/°C
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| Mechanical Properties |
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| Young’s Modulus |
67.2 GPa (9.75 x 106 psi)
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| Rupture Modulus |
55.1 MPa (8,000 psi)
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| Knoop Hardness |
105-120 kg/mm2
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| Density |
5.27 g/cm3
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| Poisson’s Ratio |
0.28
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Wavelength
(µm) |
Index |
Wavelength
(µm) |
Index |
Wavelength
(µm) |
Index |
Wavelength
(µm) |
Index |
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0.54
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2.6754
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1.8
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2.4496
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7.4
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2.4201
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13.0
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2.3850
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0.58
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2.6312
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2.2
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2.4437
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7.8
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2.4183
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13.4
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2.3816
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0.62
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2.5994
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2.6
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2.4401
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8.2
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2.4163
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13.8
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2.3781
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0.66
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2.5755
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3.0
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2.4376
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8.6
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2.4143
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14.2
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2.3744
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0.70
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2.5568
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3.4
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2.4356
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9.0
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2.4122
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14.6
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2.3705
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0.74
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2.5418
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3.8
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2.4339
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9.4
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2.4100
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15.0
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2.3665
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0.78
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2.5295
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4.2
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2.4324
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9.8
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2.4077
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15.4
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2.3623
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0.82
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2.5193
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4.6
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2.4309
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10.2
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2.4053
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15.8
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2.3579
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0.86
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2.5107
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5.0
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2.4295
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10.6
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2.4028
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16.2
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2.3534
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0.90
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2.5034
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5.4
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2.4281
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11.0
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2.4001
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16.6
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2.3487
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0.94
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2.4971
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5.8
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2.4266
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11.4
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2.3974
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17.0
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2.3448
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0.98
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2.4916
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6.2
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2.4251
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11.8
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2.3945
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17.4
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2.3387
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1.0
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2.4892
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6.6
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2.4235
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12.2
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2.3915
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17.8
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2.3333
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1.4
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2.4609
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7.0
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2.4218
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12.6
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2.3883
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18.2
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2.3278
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