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ZnSe windows can be fabricated in dimensions from 4.0mm to 300mm diameter, and in thicknesses from 1.0mm up to 50mm. The windows are AR coated at 10.6um. Many standard sizes are manufactured and held in stock.

 

l  Hi-tech manufacturing methods

l  Latest ultra-low absorption coatings

l  High quality laser grade material

 

The following standard windows are available.

 

Part No

Material

Diameter

mm

ET

mm

Incidence

deg

T

%

R

%

Coating

WIN-10.6-4.9ZWA20

ZnSe

12.5

2

0

99.4

0.1

AR/AR

WIN-10.6-5.0ZWA30

ZnSe

12.7

3

0

99.4

0.1

AR/AR

WIN-10.6-5.9ZWA10

ZnSe

15

1

0

99.4

0.1

AR/AR

WIN-10.6-5.9ZWA60UU

ZnSe

15

6

0

71

14.5

Uncoated ZnSe

WIN-10.6-6.3ZWA30

ZnSe

16

3

0

99.4

0.1

AR/AR

WIN-10.6-10ZWA20

ZnSe

25.4

2

0

99.4

0.1

AR/AR

WIN-10.6-10ZWA30

ZnSe

25.4

3

0

99.4

0.1

AR/AR

WIN-10.6-10ZWA30UU

ZnSe

25.4

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-10ZWA40

ZnSe

25.4

4

0

99.4

0.1

AR/AR

WIN-10.6-11ZWA30

ZnSe

28

3

0

99.4

0.1

AR/AR

WIN-10.6-11ZWA40

ZnSe

28

4

0

99.4

0.1

AR/AR

WIN-10.6-11ZWA50

ZnSe

28

5

0

99.4

0.1

AR/AR

WIN-10.6-11.8ZWA30UU

ZnSe

30

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-15ZWA30

ZnSe

38.05

3

0

99.4

0.1

AR/AR

WIN-10.6-15ZWA30-P30

ZnSe

38.05

3

0

99.4

0.1

AR/AR

WIN-10.6-15ZWA40

ZnSe

38.05

4

0

99.4

0.1

AR/AR

WIN-10.6-15ZWA50

ZnSe

38.05

5

0

99.4

0.1

AR/AR

WIN-10.6-15ZWA60

ZnSe

38.05

6

0

99.4

0.1

AR/AR

WIN-10.6-17.5ZWA80

ZnSe

44.5

8

0

99.4

0.1

AR/AR

WIN-10.6-19.7ZWA30

ZnSe

50

3

0

99.4

0.1

AR/AR

WIN-10.6-19.7ZWA40

ZnSe

50

4

0

99.4

0.1

AR/AR

WIN-10.6-19.7ZWA50

ZnSe

50

5

0

99.4

0.1

AR/AR

WIN-10.6-19.7ZWW50-99

ZnSe

50

5

0

1

99

AR/99%

WIN-10.6-20ZWA30UU

ZnSe

50.8

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-20ZWA40

ZnSe

50.8

4

0

99.4

0.1

AR/AR

WIN-10.6-20ZWA50

ZnSe

50.8

5

0

99.4

0.1

AR/AR

WIN-10.6-20ZWA50UU

ZnSe

50.8

5

0

71

14.5

Uncoated ZnSe

WIN-10.6-20ZWA60

ZnSe

50.8

6

0

99.4

0.1

AR/AR

WIN-10.6-25ZWA30

ZnSe

63.5

3

0

99.4

0.1

AR/AR

WIN-10.6-30ZWA30

ZnSe

76.2

3

0

99.4

0.1

AR/AR

 

The following series of ZnSe Laser Windows are manufactured especially for CO2 Laser applications. They are offered in both coated with an anti-reflectance thin-film coating applied to both surface, or uncoated which can be used for a variety of applications as they are. We can custom coat these for any wavelength or spectral performance you may require. In addition to the sizes listed below we generally have metric size diameters available such as 25mm, 50mm etc. Other diameters and thicknesses along with coating for other wavelengths can be custom manufactured quickly in our fabrication shop to your specific requirement. Although these are made extremely parallel the two surfaces to each other, they can be manufactured these with specific wedge angles from 10 minutes up to several degrees or arc. Please contact us for these or other custom parts.

 

Specifications:

Material: Zinc Selenide (ZnSe)  Laser Grade

Diameter Tolerances.    +.000”, -.005” for parts up to 2.000”Ø

+.000”, -.010” for parts from 2.50”  to 6.000”Ø 

Thickness: ±.010”

Parallelism:  < 30 seconds of arc

Surface Quality: < 40/20 scratch – dig Laser Finish

 

Spectral Performance:

Standard high efficiency low loss anti-reflectance

thin film coating applied to both sides.

Reflectance per surface @ 10.6µm for normal incidence <0.20%

Total finish part Absorption < .25%

Transmission > 99.0% typically

 

Part Number

Coated

Diameter

Thickness

Part Number

Uncoated

WIN-10.6-WZ-0508-AR

0.500"

0.080"

WIN-10.6-WZ-0508-UC

WIN-10.6-WZ-0512-AR

0.500"

0.120"

WIN-10.6-WZ-0512-UC

WIN-10.6-WZ-0516-AR

0.500"

0.160"

WIN-10.6-WZ-0516-UC

WIN-10.6-WZ-0708-AR

0.750"

0.080"

WIN-10.6-WZ-0708-UC

WIN-10.6-WZ-0712-AR

0.750"

0.120"

WIN-10.6-WZ-0712-UC

WIN-10.6-WZ-1008-AR

1.000"

0.080"

WIN-10.6-WZ-1008-UC

WIN-10.6-WZ-1012-AR

1.000"

0.120"

WIN-10.6-WZ-1012-UC

WIN-10.6-WZ-1016-AR

1.000"

0.160"

WIN-10.6-WZ-1016-UC

WIN-10.6-WZ-1112-AR

1.100"

0.120"

WIN-10.6-WZ-1112-UC

WIN-10.6-WZ-1512-AR

1.500"

0.120"

WIN-10.6-WZ-1512-UC

WIN-10.6-WZ-1516-AR

1.500"

0.160"

WIN-10.6-WZ-1516-UC

WIN-10.6-WZ-1525-AR

1.500"

0.250"

WIN-10.6-WZ-1525-UC

WIN-10.6-WZ-2012-AR

2.000"

0.120"

WIN-10.6-WZ-2012-UC

WIN-10.6-WZ-2020-AR

2.000"

0.200"

WIN-10.6-WZ-2020-UC

WIN-10.6-WZ-2025-AR

2.000"

0.250"

WIN-10.6-WZ-2025-UC

WIN-10.6-WZ-2038-AR

2.000"

0.375"

WIN-10.6-WZ-2038-UC

WIN-10.6-WZ-2525-AR

2.500"

0.250"

WIN-10.6-WZ-2525-UC

WIN-10.6-WZ-3012-AR

3.000"

0.125"

WIN-10.6-WZ-3012-UC

WIN-10.6-WZ-3025-AR

3.000"

0.250"

WIN-10.6-WZ-3025-UC

WIN-10.6-WZ-3038-AR

3.000"

0.375"

WIN-10.6-WZ-3038-UC

WIN-10.6-WZ-3025-AR

3.500"

0.250"

WIN-10.6-WZ-3025-UC

WIN-10.6-WZ-3538-AR

3.500"

0.375"

WIN-10.6-WZ-3538-UC

WIN-10.6-WZ-4025-AR

4.000"

0.250"

WIN-10.6-WZ-4025-UC

WIN-10.6-WZ-4038-AR

4.000"

0.375"

WIN-10.6-WZ-4038-UC

WIN-10.6-WZ-6050-AR

6.000"

0.500"

WIN-10.6-WZ-6050-UC

 

 Brewster Windows

 

Brewster windows operate at an angle of incidence equal to the 'Brewster angle' which is 67.4 for ZnSe at 10.6mm. In order to present a square profile to the incident beam, they are about 2.5 times longer than their width. They fully transmit linearly polarized light in the P-plane and reflect about 50% of the S-plane component. Consequently, they can be used to enhance ('clean-up') the polarization or by rotating it about the beam axis, they can be used as an attenuator. Coated versions enhance the reflectance of the S-component but at the expense of restricting the power. Usually, Brewster windows are used in pairs.

 

l   Wedged to between 1 and 3 arcminutes in order to overcome multiple interference

l   Coated or uncoated versions and many sizes available

l   High quality laser grade material

 

Sizes/tolerances

 

Custom-made Brewster plates may be made in sizes up to 200mm length as long as the specified thickness is appropriate to the size. Design tolerances for standard plates are:

 

Length

: +0 / -0.1mm

Width

: +0 / -0.1mm

Thickness

: ± 0.1mm

Flatness

: Better than λ/80 over any 25mm dia test area.

Parallelism Surface roughness

: Wedged 2.0 ± 1.0 minutes of arc. : Better than 15Å RMS.

LIDT cw

: >6000W/mm (>6kW per mm of beam dia. 1/e2)

 

The Brewster Angle

 

The Brewster angle for a material is determined by the index of refraction for the wavelength concerned. Where the refractive index is ‘n’ the Brewster angle of incidence ‘Ob’ is given by:

 

θb = TAN-1 (n)

 

In the case of ZnSe at 10.6μm, n = 2.4028, and θb = 67 24'.

 

When specifying Brewster windows having some required value for optical clear aperture, it is necessary to make appropriate allowances on the width and length of the plate for the mechanical mounting arrangement.

 

The following standard Brewster windows are available.

 

Model

Material

Diameter

mm

ET

mm

Incidence

deg

T

%

R

%

Coating

WIN-10.6-BWZ2510

ZnSe

25

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZ3315

ZnSe

33

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZE4015

ZnSe

40

3

67.4

98% P-Pol

99.5S-Pol

AR/U-EB

WIN-10.6-BWZ4218

ZnSe

42

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZ5018

ZnSe

50

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZE5018

ZnSe

50

3

67.4

98% P-Pol

99.5S-Pol

AR/U-EB

WIN-10.6-BWZ5320

ZnSe

53

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZ6122

ZnSe

61

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZ6323

ZnSe

63

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZ6625

ZnSe

66

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZE6625

ZnSe

66

3

67.4

98% P-Pol

99.5S-Pol

AR/U-EB

WIN-10.6-BWZ10038

ZnSe

100

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZ11542

ZnSe

115

3

0

71

14.5

Uncoated ZnSe

WIN-10.6-BWZ13248

ZnSe

132

3

0

71

14.5

Uncoated ZnSe

 

Applications

 

Polarization-forcing

ZnSe Brewster windows may be used within a laser resonator so as to force the laser to emit linearly polarized radiation.

 

Polarizers/analysers

Outside a laser cavity, plates may be used singly or in ‘stacks’ to perform the role of polarizers or analysers.

 

Isolators

A particularly useful function of Brewster plates occurs in the laser-processing of highly reflective metals, where Brewster-based ‘isolator’ assemblies and phase-retarder units may be used to prevent back-reflected radiation from re-entering the laser resonator.

 

Wedge Angle

If the level of parallelism of the Brewster window is high, then multiple interference between beams reflected from the two surfaces can affect the intended function of the plate. Our Brewster plates are deliberately wedged to between 1 and 3 arcminutes in order to overcome this problem.

 

Enhanced Brewsters

Plates with special coatings to enhance the polarizing function are available.

 

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Sintec Optronics Pte Ltd

10 Bukit Batok Crescent #07-02 The Spire Singapore 658079

Tel: +65 63167112 Fax: +65 63167113  

E-mail: sales@sintec.sg sales@SintecOptronics.com

URL: http://www.sintec.sghttp://www.SintecOptronics.com

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