ZnS window

ZnS materials have two grades and can be use in imaging systems. Regular grade material is grown by the chemical vapor deposition process. This material is often used in the 3um to 5 um and 8um to 12 um region. It has reasonable hardness and is moderately priced.

Multi Spectral grade ZnS (CLEARTRAN ZnS) is treated after growth to eliminate microscopic voids and defects which occur in the regular grade, thus extending the usefulness of this material to include the visible region.

Compared with zinc selenium (ZnSe), zinc sulfide is lower priced and harder, more resistant to inclement weather, with fracture strength two times that of zinc selenium, thus making it an ideal material for production of missile radome and infrared winder for military aircrafts.

Physical and chemical properties

CVD zinc sulfide

Multi Spectral CVD zinc sulfide

Density (g.cm-3@298k)

4.09

4.09

Specific resistance (Ω.cm)

~1012

~1013

Melting point (℃)

1827

Chemical purity (%)

99.9996

99.9996

Thermal expansion coefficient (1/k)

6.6×10-6@273k

6.3×10-6@273k

7.3×10-6@373k

7.0×10-6@373k

Thermal conductivity (j/k.m.s)

16.7@298k

27.2@298k

Thermal capacity (j/g.k)

0.469@298k

0.515@298k

Knoop hardness (kg/mm2)

200-235

160

Bending strength (MPa)

103

Young's modulus (GPa)

74.5

74.5

Poissons ratio

0.29

0.28

Optical properties

CVD zinc sulfide

Multi Spectral CV zinc sulfide

Transmission wavelength range

1.0μm-14μm

0.37μm-14μm

Refractivity unevenness, △n/n

<3×[email protected]μm

<0.2×[email protected]μm

Absorption coefficient (1/cm)

[email protected]μm

[email protected]μm

Thermal optical coefficient, dn/dt (1/k,

4.6×[email protected]μm

5.43×[email protected]μm

298-358k)

4.3×[email protected]μm

4.21×[email protected]μm

4.1×[email protected]μm

3.87×[email protected]μm

Change of refractivity n as a function of wavelength

CVD ZnS (20℃):

Wavelength (μm)

Refractivity (n)

Wavelength (μm)

Refractivity (n)

0.62

2.355

9.80

2.203

1.00

2.292

10.60

2.192

3.80

2.253

11.40

2.180

5.00

2.246

12.20

2.167

7.00

2.232

13.80

2.132

9.00

2.212

14.20

2.126

Multi Spectral CVD zinc sulfide (CLEARTRAN ZnS)(20℃)

Wavelength (μm)

Refractivity (n)

Wavelength (μm)

Refractivity (n)

0.40

2.545

8.00

2.223

1.01

2.292

9.00

2.213

2.06

2.264

10.00

2.201

3.50

2.255

11.25

2.183

4.50

2.250

12.00

2.171

5.00

2.247

13.00

2.153

Specifications

Material	CVD ZnS
Dimension Tolerance	+0.0/-0.1mm
Thickness Tolerance	±0.2mm
Clear Aperture	>90%
Parallelism	<1arc minutes
Surface Quality	60/40 or better
Flatness	<λ /2@633nm or better
Chamfer	Protected <0.5mmx45deg
Coating	None, per your request

Information

Product Line

WARRANTY

All products are guaranteed to be in specifications in material and workmanship for a period of 12 months after shipment.
We do not assume liability for installation, labor or consequential damages.
This warranty is not suitable for failure of the products due to misuse, abuse, accident, or neglect.

Contacts

Deln Optics
E-mail: [email protected]

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	CVD zinc sulfide	Multi Spectral CVD zinc sulfide
Density (g.cm-3@298k)	4.09	4.09
Specific resistance (Ω.cm)	~1012	~1013
Melting point (℃)	1827
Chemical purity (%)	99.9996	99.9996
Thermal expansion coefficient (1/k)	6.6×10-6@273k	6.3×10-6@273k
	7.3×10-6@373k	7.0×10-6@373k
Thermal conductivity (j/k.m.s)	16.7@298k	27.2@298k
Thermal capacity (j/g.k)	0.469@298k	0.515@298k
Knoop hardness (kg/mm2)	200-235	160
Bending strength (MPa)	103
Young's modulus (GPa)	74.5	74.5
Poissons ratio	0.29	0.28

	CVD zinc sulfide	Multi Spectral CV zinc sulfide
Transmission wavelength range	1.0μm-14μm	0.37μm-14μm
Refractivity unevenness, △n/n	<3×[email protected]μm	<0.2×[email protected]μm
Absorption coefficient (1/cm)	[email protected]μm	[email protected]μm
Thermal optical coefficient, dn/dt (1/k,	4.6×[email protected]μm	5.43×[email protected]μm
298-358k)
	4.3×[email protected]μm	4.21×[email protected]μm
	4.1×[email protected]μm	3.87×[email protected]μm

Wavelength (μm)	Refractivity (n)	Wavelength (μm)	Refractivity (n)
0.62	2.355	9.80	2.203
1.00	2.292	10.60	2.192
3.80	2.253	11.40	2.180
5.00	2.246	12.20	2.167
7.00	2.232	13.80	2.132
9.00	2.212	14.20	2.126