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Product Announcement

Knight Optical’s Magnesium Fluoride (MgF2) Windows

17 Apr 2021

Known for their resistance to mechanical and thermal shock, our Magnesium Fluoride (MgF2) Windows are specified for a variety of applications operating in a range of harsh environments. Commonly employed for high-tech applications include excimer lasers, Fourier-transform infrared spectroscopy (FTIR), thermography and other infrared (IR) systems, MgF2’s durability and birefringent properties make for a sought-after optical window across a spectrum of industries. What’s more, its stability in water means it’s ideally suited for outer surfaces, such as windows.

With its birefringence (beneficial for polarisers in the UV waveband), transmittance between 0.1µm and 7µm and at over 90% between 0.4-5.0µm and hardness of circa HK576, MgF2 is one of the hardest optical fluorides. 

Here at Knight Optical, we stock a wide range of MgF2 Windows suitable for a variety of diverse applications. Furthermore, for applications requiring tailored solutions, we also supply custom-made MgF2 Windows in a range of sizes, shapes, substrates (including infrared [IR] MgF2 materials) and tolerances for seamless integration with any device. Alongside our customised offering, we also supply MgF2 Windows mounted into cells and can edge down stock in-house for quick lead times. 

Typical Specs:

Material: Magnesium Fluoride (MgF2)

Diameter: +/-0.2mm

Thickness:  ± 0.2mm

Surface quality: <60-40 Scratch/Dig

First-Class Quality 

Quality is the driving force behind Knight Optical, and to ensure you profit from high-precision optics, we take the utmost care to ensure every component accurately meets your specifications. Offering unparalleled service, Knight Optical undertakes a full inspection of your optics from our ISO 9001:2015-certified, state-of-the-art Metrology Laboratory, followed by a meticulous visual examination by our dedicated QA department. 

To discover how we can enhance your supply chain experience and to learn more about our stock and custom-made MgF2 Windows, contact a member of our technical sales team today. 

UK, Europe, Asia & RoW: E-mail info@knightoptical.co.uk 

Tel +44 (0)1622 859444

USA & Canada: E-mail usasales@knightoptical.com 

Tel +001 401-583-7846 


Knight optical USA, knight optical UK, excimer lasers, MgF2 Windows, Fourier-transform infrared spectroscopy, (FTIR), thermography, infrared (IR) systems, birefringent properties, infrared [IR] MgF2 materials), hardest optical fluorides

Knight Optical Ltd
Roebuck Business Park
ME17 1AB
United Kingdom
Tel: 44 (0)1622 859444
Fax: 44 (0)1622 859 555
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