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Optical Windows Laser Window Infrared Brewster - China

price: contact company for price

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


Wavelength Range

Reflection Specifications


¼ Wave 550nm

Ravg ≤ 1.75% 400 - 700nm (N-BK7)

VIS 0°

425 - 675nm

Ravg ≤ 0.4% 425 - 675nm

VIS 45°

Ravg ≤ 0.75% 425 - 675nm


250 - 450nm

Ravg ≤ 0.75% 250 - 425nm

Ravg ≤ 0.5% 370 - 420nm


250 - 700nm

Ravg ≤ 1.5% 250 - 700nm


400 - 1000nm

Ravg ≤ 1.25% 400 - 870nm

Ravg ≤ 1.25% 890 - 1000nm


600 - 1050nm

Ravg ≤ 0.5% 600 - 1050nm


750 - 1550nm

Rave ≤ 0.7% 750 - 1550nm


1200 - 1600nm

Ravg ≤ 0.25% 1200 - 1600nm


900 - 1700nm

Ravg ≤ 1.0% 900 - 1700nm


3 - 5um

Ravg ≤ 2% 3-5um


8 - 12um

Ravg ≤ 2% 8-12um


3 - 12um

Ravg ≤ 5% 3-12um


Design wavelength

R ≤ 0.25% DWL

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.


UV grade fused silica

Dimension Tolerance


Thickness Tolerance


Clear Aperture



5 arc seconds

Surface Quality


Wavefront Distortion

High Precision: λ/10 at 633nm per 25mm


Protected <0.25mmx45deg

AR Coating

R ≤ 0.25% per surface at DWL


266nm, 355nm, 405nm, 532nm, 633nm, 755nm, 785nm, 980nm, 1064nm, 1550nm

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.

CaF2, MgF2, Si, Ge, and ZnSe

> 90%

< 1 arc min


< λ at 633nm per 25mm

< 0.25mmx45deg

Ravg ≤ 2% 3-5um or Ravg ≤ 2% 8-12um or Ravg ≤ 5% 3-12um or None,

Other coatings is available upon request

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.

N-BK7 Grade A optical glass, UV grade fused silica

< 10 arc seconds

λ/10 at 633nm per 25mm

Brewster Angle:

55° 32'

Company Contact:

  • Phone: 8643181973695

  • Address: No.59, Yuanda Street, Erdao District,, changchun, China

  • Email: Email

Published date: May 15, 2013 -

  • Business Description: DELN Optics (CHINA) Manufacture highest quality crystals and optical


    Including YAG Series, Nd:GdVO4, YVO4, KDP, KTP, HGTR KTP, DKDP, BBO, LBO, Ti: Sapphire, LiNbO3, LiTaO3, BaF2, MgF2, CaF2 crystals and prisms, lenses, Cylindrical Lenses, filters, polarizes, mirrors, beamsplitters, windows, waveplates and micro optics.

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