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Looking For a Custom Optical Solution? Enquire

Knight Optical has been serving the laser industry for many years, providing both catalogue products and custom laser optics to our customers. These laser components include:

  • Ultrafast Laser Mirrors
  • Thin film polarisers
  • Laser output couplers
  • Broadband, dual and multi-band mirrors

For such demanding applications, often the tightest specifications are required to ensure the optical component is able to perform with minimal negative impact, such as absorption and scattering of the laser beam, or laser induced damage to the coating and laser optic itself.

Our typical custom capabilities include:

  • Dimensions: 3mm to 250mm.
  • Spectral range: 200nm to 5000nm.
  • Flat, spherical and wedged substrates.

However, these can vary for the different component types, for example, the membrane mirrors which are usually required in larger sizes can be manufactured to diameters up to 400mm, whilst the extreme low-loss mirrors are generally only achievable in smaller diameters up to 50mm.

Below are some typical laser optics that Knight Optical can help with:

Laser Mirrors

  • Ultrafast Laser Line
  • Low GDD Ultrafast
  • Multipass Cell (MPC) mirrors
  • Broadband Dielectric
  • Extreme low-loss
  • Laser line
  • Dual/multi-wavelength mirrors
  • Membrane Mirrors

& wavelength separators

  • High Power Thin Film
  • Thin film polarisers


  • Laser output couplers
  • Non-polarising plates
  • Partial reflection mirrors
  • Wavelength separators

Knight Optical is proud to offer a vast range of laser optics coated using ion beam sputtering (IBS) technology which can provide optimum coatings for demanding laser applications.

Ion beam sputtering, a physical vapour deposition (PVD) technique, coats the substrate with controlled and precise thin-film layers of material. This technique creates a compact coating layer which is durable and environmentally stable.

All laser optics go through our metrology laboratory for testing, before being 100% visually inspected in our QA department.

Our metrology laboratory is equipped with an Agilent Cary 7000 to test coatings at varying angles of incidence and polarisation states. Our QA technicians are trained to check for < 20/10 (or equivalent ISO specifications) surface quality to ensure they meet the demanding requirements that are expected of laser optics.

Test data and FAI reports are available upon request.

Advantages of IBS coatings

Ion Beam Sputtering (IBS) coatings have numerous benefits including:

  • High LDT
  • GDD optimisation
  • High reflectance
  • Low absorption
  • Low scatter
  • Controlled surface flatness and quality
  • Achievable high extinction ratio

Optic Substrates

Different lasers and wavelengths will require different substrates. We have vast experience in providing optics that are suitable for use in UV, visible and infrared regions. This includes UV fused silica, Zinc selenide is ideal for CO2 lasers

Laser Technical Information

When enquiring for laser optics, it helps our team if we have further technical information regarding your laser type, such as:

  • Wavelength, nm
  • Pulse energy or Average Power
  • Pulse width
  • Repetition rate
  • Beam size
  • AOI
  • Beam shape
  • Environment (air/vacuum)

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