Optical Window, Parallel, N-BK7, 50.8 mm, λ/20, 1000-1550nm

The 20BW40-30AR.18 Laser-Grade Parallel Window is parallel to less than 30 arc sec for minimal transmitted beam deviation. This 2 inch (50.8 mm) diameter N-BK7 window is 10 mm thick. It has Newport's AR.18 broadband IR antireflection coating for a 1000 to 1550 nm wavelength range. For demanding applications, such as intracavity laser applications, holography, and multiphoton imaging, this window has a λ/20 surface flatness and 10-5 scratch-dig significantly reducing unwanted scatter.

Specifications

Technical Specs

Diameter
50.8 mm
Material
Grade A N-BK7
Antireflection Coating
1000-1550 nm
Surface Flatness
λ/20 @ 632.8 nm
Surface Quality
10-5 scratch-dig
Thickness
10.0 mm
Thickness Tolerance
±0.25 mm
Transmitted Beam Deviation
±30 arc sec
Wavefront Distortion
λ/10 @ 632.8 nm
Chamfers
0.38–1.14 mm face width

Chamfers Angle/Tolerance
45° ±15°
Cleaning
See How to Clean Optics
Clear Aperture
Central 85% of diameter
Diameter Tolerance
+0/-0.15 mm
Coating Code
AR.18
Wedge
≤30 arc sec
Damage Threshold
7.5 J/cm², 10 ns pulses, 20 Hz at 1064 nm

Diameter
50.8 mm
Material
Grade A N-BK7
Antireflection Coating
1000-1550 nm
Surface Flatness
λ/20 @ 632.8 nm
Surface Quality
10-5 scratch-dig
Thickness
10.0 mm
Thickness Tolerance
±0.25 mm
Transmitted Beam Deviation
±30 arc sec
Wavefront Distortion
λ/10 @ 632.8 nm
Chamfers
0.38–1.14 mm face width

Chamfers Angle/Tolerance
45° ±15°
Cleaning
See How to Clean Optics
Clear Aperture
Central 85% of diameter
Diameter Tolerance
+0/-0.15 mm
Coating Code
AR.18
Wedge
≤30 arc sec
Damage Threshold
7.5 J/cm², 10 ns pulses, 20 Hz at 1064 nm

Resources & Downloads

2D Product Drawings

PARALLEL-S(95 kB, PDF)

Software

20BW40-30AR.18 Zemax File(5.5 kB, ZMX)

Other

20BW40-30AR.18 RoHS Certificate(706.5 kB, PDF)
AR.18 Raw Data.xlsx(113.4 kB, XLSX)

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