Europe, UK, Asia & RoW: [email protected] +44 (0)1622 859444 | USA & Canada: [email protected] +1 401-583-7846

GLOBAL LEADERS IN CUSTOM OPTICAL SOLUTIONS

Looking For a Custom Optical Solution? Enquire

Custom Windows


custom windows, infrared windows, cell windows, optical coated windowsAs well as offering stock windows, ready to order, Knight Optical is experienced in providing fit for purpose optical windows manufactured to our customers’ own requirements. From UV windows designed for use in Excimer lasers to infrared germanium windows used in thermal imaging, Knight Optical has been at the forefront of providing precision, high quality optics to a vast number of different industries.

Available materials include:

  • UV materials such as calcium fluoride, magnesium fluoride, UV fused silica (JGS1/JGS2), and crystalline quartz.
  • Visible materials such as BK7 and other Schott (or equivalent) glass, borosilicate, B270, float glass, and sapphire.
  • Infrared materials such as germanium, silicon, zinc selenide, chalcogenide glass, and IR fused quartz (JGS3).
  • PMMA (acrylic).

Below are our typical manufacturing capabilities for visible applications using Schott (or equivalent) materials however we are always expanding our capabilities so please do not hesitate to contact us. Due to the different manufacturing/growing processes for more specialist UV and IR substrates the manufacturing capabilities can vary. Our infrared materials page has further information on different substrates available.
 

 

Dimensions

Surface figure

Parallelism

Scratch/dig

Windows

2mm to 300mm+

< 0.5 fringes

< 3 arc minutes

< 60/40

Light Guides

5mm to 100mm+

< 0.5 fringes

< 3 arc minutes

< 60/40

Domes

5mm to 300mm+

Concentricity:

< 0.05mm

< 60/40

 
Knight Optical have different sheet materials available which can be cut to size for custom requirements. The table below lists the substrates, dimensions and coatings available on our standard sheet glass:
 

Material

Length x Width

Thickness

Coating

PMMA

380x310mm

1mm

2 sides AR coated
R(avg) < 1% @ 400-700nm

Soda-Lime

300x300mm

1mm

ITO
(20 ohm/sq inch)

B270

406x258mm

1/1.35/1.65/2/3/

4/6/7mm

Uncoated

B270

150x100mm

1mm/2mm

1 side AR coated

R(avg)<0.5% @ 450-900nm

1mm/2mm

2 sides AR coated

R(avg) < 0.5% @ 450-900nm

B270

145x100mm

1mm/3mm/4mm

1 side AR coated

R(avg) < 0.5% @ 1050-1700nm

2 sides AR coated

R(avg) < 0.5% @ 1050-1700nm

Borosilicate

1150x850mm

1.1/1.75/2/2.25/2.7/

5/3/3.8/5/5.5/

6.5/7.5/9/10.2/

11/13/15/16mm

Uncoated

Borosilicate

450mmdia

1.1mm/2mm

1 side AR coated

R(avg) < 2% @ 400-1000nm

2 sides AR coated

R(avg) < 2% @ 400-1000nm

Opti-white (low iron)

1770x1200mm

2mm/3mm/4mm

1 side AR coated

R(avg) < 1.5% @ 425-680nm

2 sides AR coated

R(avg) < 1.5% @ 425-680nm

 

UV vs IR Fused Silica %T Comparison

BBAR 450-900nm

BBAR 1050-1700nm

Browse the categories below for further information on the specialty windows Knight Optical can help with:

Additional Information

  • For a fast turnaround on small orders, it is possible to edge down our stock windows to meet more specific requirements.
  • Knight Optical can also provide windows with more bespoke requirements requiring CNC edging or drilled holes.
  • Toughened, or tempered, glass can be provided with increased strength and thermal resistance, ideal for safety windows.
  • Optical windows can be used as substrates for filters, mirrors and beamsplitters.

Coatings

Knight Optical can also apply a wide range of coatings to your optical windows to enhance their transmission or increase their durability:

  • Antireflective (AR) coatings, including broadband coatings, to optimise the transmission at certain wavelengths or across a range.
  • Diamond-like carbon (DLC) coating to increase the durability of a surface.
  • Hydrophobic coating to repel water from a surface.
  • More specialist coatings such as ITO, anti-fog and oleophobic.

Quality Assurance

  • The flatness and irregularity of our optical windows are tested on our Zygo Verifire XPZ interferometer, where we can also test the transmitted wavefront error of the window.
  • We check the parallelism on our Trioptics PrismMaster which is accurate to 3 arc seconds.
  • Transmission and reflection scans are conducted on our Agilent Cary 7000 Spectrophotomer which can perform spectral scans at multiple angles of incidence and different polarisations.
  • We can also test infrared optical components on our Agilent Cary 660 FTIR spectrometer.
  • All optics are 100% visually inspected before packaging, our staff are trained to ISO 10110 and MIL-0-13830A, and can check down to 10/5 scratch/dig which is especially critical in laser applications.

 

Our 2022/2023 Catalogue

Inside Knight Optical’s catalogue you’ll find details of the industries we serve as well as the many other services we can offer. It also showcases hundreds of our most popular products, supported by useful technical information, to help you choose the right part for your application.
Click below to view our digital catalogue now.

view our catalogue