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    Optical Color Filters

    Infrared cut-off filters

    sometimes called IR filters or heat-absorbing filters, are designed to reflect or block mid-infrared wavelengths while passing visible light. They are often used in devices with bright incandescent light bulbs (such as slide and overhead projectors) to prevent unwanted heating. There are also filters which are used in solid state (CCD or CMOS) video cameras to block IR due to the high sensitivity of many camera sensors to near-infrared light. These filters typically have a blue hue to them as they also sometimes block some of the light from the longer red wavelengths.  

    ①Materails: K9, BK7, B270, D263T, FS, Colored glass, Float glass

    ②Size Range: 3mm-110mm for round shape, 2mm-150mm for rectangle shape

    Thickness Range: 0.2mm-10mm

    Available wavelength: 200nm-1200nm
    Best FWHM: 940nm+/-3nm

    Transmission>86%
    Transmission range:400-640nm
    cut off:700-110nm
    T<1%

    Surface quality: 60/40

     Coating: Metallic coated, dielectric coated

    Negative filters

    Notch Filters selectively reject a portion of the spectrum, while transmitting all other wavelengths. Featuring dielectric  coatings to reflect the laser wavelength, notch filters are available with different levels of blocking and transmission ranges to provide customers options on performance and value.

    notch filters are commonly used in laser-based fluorescence instrumentation and biomedical laser systems.
    Material:K9 or BK7

    Operating Temperature:-40℃ ~ +60℃

    Average Transmittance:

    Tave >90%@488~1500nm

    Average Blocking:OD4

    ④Surface Quality: 60/40
    ⑤Center Wavelength Range:
    355, 405, 442, 488,532,632.8,785, 808, 830, 980, 1064nm

    ⑥Diameter:D3mm, D5mm to 50mm

    ⑦Diameter Tolerance: +0.0/-0.1mm

    ⑧Thickness :3.5mm, 5mm ±0.1

    BHOE can supply a full range of filter. They are short pass, long pass, band pass, ultraviolet, infrared, heat absorbing, and color temperature conversion filters. We use material by China to Schott, Hoya, and other manufacturers to process them. Metallic films, colored glasses and thin dielectric films filter are all available per your requirements.
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