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Zinc selenide is a clear yellow polycrystalline material with a grain size of approximately 70m, transmitting in the range 0.5-15m. 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 at 10.6m. However it is also a popular choice in systems operating at various bands within its wide transmission range. ZnSe has a high resistance to thermal shock making it the best material for high power CO2 laser systems. ZnSe however is only 2/3 the hardness of ZnS multi-specral grade but the harder anti-reflectance coatings do serve to protect ZnSe. Zinc Selenide is a relatively soft material and scratches rather easily. It requires an anti- reflection coating due to its high refractive index if high transmission is required. ZnSe has a rather low dispersion across its useful transmission range. For high power applications, it is 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.

 

Optical Properties

Bulk Absorption Coefficient @ 10.6m

0.0005/cm

Temp. Change of Refractive Index @ 10.6m

61x10-6/C

Refractive Index Non-homogeneity @ 632.8nm

<6X10-6 

 

Thermal Properties 

Thermal Conductivity

0.18W/cm/C

Specific Heat

0.356J/g/C

Linear Expansion Coefficient @ 20C

7.57x10-6/C

 

Mechanical Properties 

Young's Modulus

6.85X1011 dyne/cm2

Rupture Modulus

5.7X108 dyne/cm2

Knoop Hardness

110-130Kg/mm2

Density

5.27g/cm3

Poisson's Ratio 

0.28

 

Refractive Index of CVD ZnSe:

Wavelength

(m)

Index

Wavelength

(m)

Index

Wavelength

(m)

Index

Wavelength

(m)

Index

0,54

2,68

1,8

2,45

7,4

2,42

13.0

2,39

0,58

2,63

2,2

2,44

7,8

2,42

13,4

2,38

0,62

2,60

2,6

2,44

8,2

2,42

13,8

2,38

0,66

2,58

3.0

2,44

8,6

2,41

14,2

2,37

0,70

2,56

3,4

2,44

9.0

2,41

14,6

2,37

0,74

2,54

3,8

2,43

9,40

2,41

15.0

2,37

0,78

2,53

4,2

2,43

9,80

2,41

15,4

2,36

0,82

2,52

4,6

2,43

10,2

2,41

15,8

2,36

0,86

2,51

5.0

2,43

10,6

2,40

16,2

2,35

0,90

2,50

5,4

2,43

11.0

2,40

16,6

2,35

0,94

2,50

5,8

2,43

11,4

2,40

17.0

2,34

0,98

2,49

6,2

2,43

11,8

2,39

17,4

2,34

1.0

2,49

6,6

2,42

12,2

2,39

17,8

2,33

1,4

2,46

7.0

2,42

12,6

2,39

18,2

2,33

 

Zinc Serenade Transmission Graph

 

 
 CO2 laser focusing lenses

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