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Optical Windows are flat, plane-parallel plates that are often used as protective barriers for electronic sensors or detectors from outside environments. Optical Windows should be selected based on the material transmission or mechanical properties of the substrate. DeLn Optics’ Optical Windows are offered in a variety of substrates, such as Ge, Si, N-BK7, UV Fused Silica, ZnSe, Multiple anti-reflection coating options are available for the UV, visible, or IR.
Standard AR Coating
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Name
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Wavelength Range
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Reflection Specifications
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MgF2
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¼ Wave 550nm
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Ravg ≤ 1.75% 400 - 700nm (N-BK7)
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VIS 0°
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425 - 675nm
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Ravg ≤ 0.4% 425 - 675nm
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VIS 45°
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425 - 675nm
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Ravg ≤ 0.75% 425 - 675nm
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UV-AR
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250 - 450nm
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Ravg ≤ 0.75% 250 - 425nm
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Ravg ≤ 0.5% 370 - 420nm
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UV-VIS
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250 - 700nm
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Ravg ≤ 1.5% 250 - 700nm
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VIS-NIR
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400 - 1000nm
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Ravg ≤ 1.25% 400 - 870nm
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Ravg ≤ 1.25% 890 - 1000nm
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NIR 1
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600 - 1050nm
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Ravg ≤ 0.5% 600 - 1050nm
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NIR 2
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750 - 1550nm
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Rave ≤ 0.7% 750 - 1550nm
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NIR3
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1200 - 1600nm
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Ravg ≤ 0.25% 1200 - 1600nm
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NIR4
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900 - 1700nm
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Ravg ≤ 1.0% 900 - 1700nm
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NIR5
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3 - 5um
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Ravg ≤ 2% 3-5um
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NIR6
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8 - 12um
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Ravg ≤ 2% 8-12um
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NIR7
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3 - 12um
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Ravg ≤ 5% 3-12um
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"V"
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Design wavelength
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R ≤ 0.25% DWL
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Laser Windows are ideally suited for applications which require protecting laser output. Laser Windows feature a high efficiency, high damage threshold V-coating to maximize transmission at the design wavelength.
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Material
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UV grade fused silica
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Dimension Tolerance
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+0.0/-0.1mm
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Thickness Tolerance
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±0.1mm
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Clear Aperture
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>90%
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Parallelism
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5 arc seconds
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Surface Quality
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20/10
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Wavefront Distortion
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High Precision: λ/10 at 633nm per 25mm
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Chamfer
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Protected <0.25mmx45deg
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AR Coating
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R ≤ 0.25% per surface at DWL
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Wavelengths
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266nm, 355nm, 405nm, 532nm, 633nm, 755nm, 785nm, 980nm, 1064nm, 1550nm
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DeLn Optics offers a wide variety of infrared windows. the available material includes CaF2, MgF2, Si, Ge, and ZnSe etc. We can offer different AR coatings covering 3-12µm.
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Material
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CaF2, MgF2, Si, Ge, and ZnSe
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Dimension Tolerance
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+0.0/-0.1mm
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Thickness Tolerance
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±0.1mm
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Clear Aperture
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> 90%
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Parallelism
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< 1 arc min
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Surface Quality
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60/40
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Wavefront Distortion
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< λ at 633nm per 25mm
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Chamfer
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< 0.25mmx45deg
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AR Coating
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Ravg ≤ 2% 3-5um or Ravg ≤ 2% 8-12um or Ravg ≤ 5% 3-12um or None,
Other coatings is available upon request
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Brewster Windows are uncoated substrates of laser grade surface quality and parallelism that are designed to be used at Brewster’s Angle (the angle at which p-polarized light incident on the surface is not reflected). At this angle, p polarization reflectance drops to zero. When used in a laser cavity, a Brewster Window reduces the cavity loss for p-polarized light compared to s-polarized light. The result of preferentially reducing the loss along one polarization axis is that the laser will emit linearly polarized light.
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Material
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N-BK7 Grade A optical glass, UV grade fused silica
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Dimension Tolerance
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+0.0/-0.1mm
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Thickness Tolerance
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±0.1mm
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Clear Aperture
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> 90%
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Parallelism
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< 10 arc seconds
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Surface Quality
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20/10
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Wavefront Distortion
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λ/10 at 633nm per 25mm
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Brewster Angle:
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55° 32'
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Chamfer
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< 0.25mmx45deg
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