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Custom Potassium Bromide

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Knight Optical offers high-quality potassium bromide optics, ideal for various spectroscopic applications due to their wide transmission band across UV, visible, MWIR, and LWIR wavebands.

We provide a diverse range of potassium bromide optical components, including potassium bromide windows, lenses, and prisms, catering to a wide array of uses and applications. Our potassium bromide products are perfect for those in need of precise, high-quality optical components. Additionally, for those looking to purchase, our potassium bromide for sale encompasses options that suit different specifications and needs.

For those interested in enhanced performance, we offer both uncoated and coated potassium bromide glass options, including broadband antireflective (BBAR) coatings, to improve the efficiency of your optical systems. This makes our potassium bromide products adaptable to a broad range of applications, ensuring you receive optics that meet your exact needs.For any enquiries or to explore our extensive range of potassium bromide products, don’t hesitate to contact our experienced technical sales team. With Knight Optical, you can trust that you are getting the best potassium bromide glass and components specifically for your requirements.

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    Optical Properties of Potassium Bromide

    With Knight Optical’s state-of-the-art metrology laboratory, every potassium bromide window and component is assured to meet strict quality standards. Our commitment to excellence ensures that all potassium bromide optics dispatched from our facilities are of the highest quality, ready to be integrated into your precise applications.

    Understanding the importance of affordability, we ensure that our potassium bromide cost is competitive and provides value for the quality and precision offered. Our technical sales team is always on hand to discuss potassium bromide use and help integrate these components effectively into your projects.

    Below is a brief summary of potassium bromide’s optical properties, a full data sheet is available here.

    Transmission Range0.23 to 25µm
    Refractive Index1.527 @ 10µm
    Density2.753 g/cm3
    Melting Point730°C
    HardnessKnoop 7 <100> with 200g indenter
    Operating Temperature< 300°C
    Diameter< 5mm to 200mm
    Form error (@633nm)< 0.25 waves
    Centration/parallelism< 1 arc minute
    Scratch/dig< 40/20
    Typical coatingsBBAR @ 1-25µm, DLC @ 1-25µm

    Frequently Asked Questions

    Potassium Bromide is widely used in infrared spectroscopy as it is transparent to infrared light. It is also used in the manufacturing of optics, like windows and lenses, due to its optical properties. Additionally, it finds applications in medical and veterinary medicine.

    Potassium Bromide can be purchased from chemical suppliers, online marketplaces, and companies specializing in scientific and optical materials, such as Knight Optical. Prices may vary based on purity, quantity, and supplier.

    The cost of Potassium Bromide may vary based on market demand, production costs, and availability. Generally, it is competitively priced compared to other infrared optical materials, but prices can fluctuate due to external market factors.

    When using a Potassium Bromide window, consider its hygroscopic nature, meaning it easily absorbs moisture from the air. This requires careful handling and storage. Its optical properties, particularly its transmission in the infrared range, make it suitable for specific applications like IR spectroscopy.

    Potassium Bromide optics are primarily utilized in infrared spectroscopy and thermal imaging systems due to their excellent infrared transmission properties. They are also used in scientific research and industrial applications requiring infrared light transmission.

    While Potassium Bromide is not typically used to make “glass” in the traditional sense, it is pressed into windows and lenses for infrared optics. These “glass” components are essential for applications requiring the passage of infrared light, such as in IR spectroscopy and thermal imaging cameras.

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    Additional Information


    Potassium Bromide is grown via the Kyropoulos method and cleaves easily. Though it is extremely sensitive to moisture, it can still be highly polished under humidity controlled conditions. KBr is also relatively resistant to mechanical shock.


    Potassium bromide can also be highly polished to achieve the high degree of flatness that is needed.



    Potassium bromide is very hygroscopic, so must be used in a moisture-free environment otherwise the surface of the optics will degrade.



    We can offer broadband antireflective (BBAR) coatings for your potassium bromide.

    Typical Applications

    Germanium for Fourier Transform Infrared Spectroscopy (FTIR)

    Fourier Transform Infrared Spectroscopy (FTIR)

    IR grade KBr is widely used in FTIR spectroscopy, especially as the beamsplitter substrate. It enables an extended wavelength range of 4000-400cm-1 compared to, for example, sodium chloride’s 4000-650cm-1. It also shows no absorption in this region. 

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    With our in-house state-of-the-art metrology laboratory you can be confident that your optical components will meet your requirements. You can find out more about our testing facilities here.

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