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AR-Coated Windows

Windows are frequently used in optical systems to separate the environment in one part of the system from another, such as to seal vacuum or high-pressure cells. Because the infrared transmitting material has a high index of refraction, an anti-reflection coating is typically applied to windows to minimize losses due to reflections.

For guidelines about calculating the proper thickness for a window to withstand a given pressure, see our Pressure Loading tutorial.

Below is the typical transmission of an AR coated, ZnSe window at 0° incidence:

Specification

Specifications
Standards
Dimensional Tolerance
Diameter: +0.000”-0.005”
Thickness: +0.005“-0.010”
Edge Thickness Variation (ETV)
<= 3 arc minutes
Clear Aperture (polished)
90% of diameter
Surface Figure (power/irregularity) at 0.63µm
1.0 fringe/0.5 fringe
Scratch-Dig
20-10
AR Coating Reflectivity per Surface at 10.6µm
< 0.20%
 

Part Numbers

Part #
Description
Diameter
(inches)
Diameter
(mm)
Thickness
(inches)
Thickness
(mm)
185217
ZnSe
0.25
6.35
0.080
2.03
568604
ZnSe
0.375
9.53
0.080
2.03
162879
ZnSe
0.50
12.7
0.080
2.03
457172
ZnSe
0.75
19.05
0.080
2.03
735199
ZnSe
1.0
25.4
0.080
2.03
617035
ZnSe
1.0
25.4
0.120
3.05
834076
ZnSe
1.1
27.94
0.120
3.05
184651
ZnSe
1.5
38.1
0.120
3.05
883636
ZnSe
2.0
50.8
0.200
5.08
243559
ZnSe
2.5
63.5
0.250
6.35
616847
ZnSe
3.0
76.2
0.250
6.35
AR coated windows are available in other substrates and as uncoated windows. We also offer AR coatings at other wavelengths or wavelength bands. Contact a II-VI sales representative for exact specifications.

 

Band-Selective Resonator Optics

Most CO2 lasers operate in the wavelength band at 10.6µm. This wavelength band is fine for cutting steel and certain other materials; however, other industrial laser applications -- such as plastics processing -- need a different, specific wavelength band for maximum production efficiency.

II-VI’s band-selective resonator optics effectively “lock” a CO2 laser to a specific wavelength band for specialized industrial applications, such as the 9.3µm band for circuit board drilling and plastics marking.

Our band-selective resonator optics are designed for both standard CO2 gas mixes and isotope fills.

Brewster Windows

Rectangular Brewster windows are uncoated substrates used in an optical system at Brewster’s Angle, the angle at which p reflectance drops to zero. This can be calculated from:

ΘB = tan-1(n)

where ΘB is Brewster’s Angle and n is the material’s index of refraction. When used in a laser cavity, a Brewster Window causes polarized laser output.

Fixed beam polarization is often required so that optical components in the system perform consistently as designed. Since many optics and coatings are polarization sensitive, a laser with a time varying polarization state can cause fluctuations in system performance.

While virtually all of the p component of polarization is transmitted by a Brewster Window, most of the s component is reflected. For ZnSe, 50% of the incident s-polarized light is reflected per surface. Ge, with a higher index of refraction, has an approximately 87% fresnel reflection of the s-polarization component at 10.6µm.

Specifications

Specifications
Standards
 
Dimensional Tolerances
Width
Length
Thickness
+0.000”-0.005”
+0.000”-0.005”
+0.005”-0.010”
Parallelism
Plano
<= 3 arc minutes
Clear Aperture (polished)
90% of diameter
Surface Figure at 0.63µm
Width
Length
Power: 1 fringe per inch; Irregularity:0.5 fringe per inch
Power: 1 fringe per inch; Irregularity: 0.5 fringe per inch
Scratch-Dig
 
20-10
Brewster Angle at 10.6µm
ZnSe
Ge
67.4º
76.0º

Parts Information

Part #
Description
Width
(inches)
Width
(mm)
Length
(inches)
Length
(mm)
Thickness
(mm)
Thickness
(mm)
746216
ZnSe
0.40
10.16
1.04
26.4
0.080
2.03
282837
ZnSe
0.50
12.7
1.30
33.0
0.080
2.03
154022
ZnSe
0.60
15.24
1.56
39.6
0.080
2.03
749878
ZnSe
0.70
17.78
1.82
46.2
0.080
2.03
768646
ZnSe
0.80
20.32
2.08
52.8
0.120
3.05
761688
ZnSe
0.90
22.86
2.34
59.4
0.120
3.05
134369
ZnSe
1.00
25.4
2.60
66.0
0.120
3.05
723434
ZnSe
1.50
38.1
3.91
99.3
0.160
4.06
260345
ZnSe
2.00
50.8
5.21
132.3
0.200
5.08
Output Couplers (Partial Reflectors)

Partial reflectors are commonly used as laser output couplers or beam attenuators.

For your convenience, II-VI maintains commonly used coatings and substrate radii of curvature in inventory. For available special substrate sizes and coatings, please contact a II-VI sales representative for a quotation.

Laser output couplers often require a slightly wedged substrate to eliminate interference from multiple reflections inside the component. If you require a specific wedge value, please specify this when ordering.

Protective Windows

To protect scan lenses from backsplatter and other workplace hazards, II-VI offers protective windows -- also known as debris windows -- that are either included as the overall scan lens assembly part, or sold separately. These plano-plano windows are available in both ZnSe and Ge materials and also supplied mounted or unmounted.

ZnSe protective windows feature our standard AR or DAR coating. Ge protective windows feature either our standard AR coating, or an optional diamond-like carbon coating (DLC) designed to withstand the most severe conditions likely to be encountered in industrial operations.

Part Information

Part #
Description
Diameter
(inches)
Diameter
(mm)
Edge
Thickness
(inches)
Edge
Thickness
(mm)
Coating
Type
Wavelength
(µm)
290025
ZnSe
3.94
100
0.197
5.0
AR
9.3
185594
ZnSe
4.3
109
0.375
9.53
AR
9.3
355172
ZnSe
4.37
111
0.197
5.0
AR
9.3
139647
ZnSe
5.5
140
0.375
9.53
AR
9.3
774352
ZnSe
5.5
140
0.375
9.53
AR
10.6
221234
Ge
3.94
100
0.197
5.0
DLC
9.4
425225
Ge
4.25
108
0.197
5.0
DLC
9.4
221345
Ge
4.64
118
0.197
5.0
DLC
9.4
505791
Ge
4.76
121
0.197
5.0
DLC
9.4

 

Rear Mirrors for CO2 Laser Systems

Rear mirrors, typically GaAs, Ge, or ZnSe, are partial reflectors with a very high reflection-to-transmission ratio (99.0% to 99.7%), and are key optical components in laser resonators or laser cavities. Rear mirrors, like output couplers, are a part of the lasing process. Thus, high reflectivity is desired. The rear mirrors slight transmission is used in conjunction with power meters to test for laser resonator output power.

When laser resonator designs require rear mirrors to be total reflectors, Si, Cu, or Mo substrates are used, the latter being typically uncoated.

AR-Coated Windows
Windows are frequently used in optical systems to separate the environment in one part of the system from another, such as to seal vacuum or high-pressure cells. Because the infrared transmitting material has a high index of refraction, an anti-re... Read More
Band-Selective Resonator Optics
Most CO2 lasers operate in the wavelength band at 10.6µm. This wavelength band is fine for cutting steel and certain other materials; however, other industrial laser applications -- such as plastics processing -- need a different, specific wavele... Read More
Brewster Windows
Rectangular Brewster windows are uncoated substrates used in an optical system at Brewster’s Angle, the angle at which p reflectance drops to zero. This can be calculated from: ΘB = tan-1(n) where ΘB is Brewster’s Angle and n... Read More
Output Couplers (Partial Reflectors)
Partial reflectors are commonly used as laser output couplers or beam attenuators. For your convenience, II-VI maintains commonly used coatings and substrate radii of curvature in inventory. For available special substrate sizes and coatin... Read More
Protective Windows
To protect scan lenses from backsplatter and other workplace hazards, II-VI offers protective windows -- also known as debris windows -- that are either included as the overall scan lens assembly part, or sold separately. These plano-plano windows... Read More
Rear Mirrors for CO2 Laser Systems
Rear mirrors, typically GaAs, Ge, or ZnSe, are partial reflectors with a very high reflection-to-transmission ratio (99.0% to 99.7%), and are key optical components in laser resonators or laser cavities. Rear mirrors, like output couplers, are a p... Read More
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