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UV Fused Silica Variable Neutral Density Optical Filter 77mm

Categories Optical Filter
Brand Name: FSO
Model Number: FSF-1
Certification: ROHS/SGS
Place of Origin: China
MOQ: 1 pcs
Price: Negotiation
Payment Terms: T/T
Supply Ability: 10000pcs/month
Delivery Time: As customer's requirement
Packaging Details: Standard
Material: fused silica or optical glass
Size: customized
Surface quality: 60/40 or better
Diameter Tolerance: 0.0/-0.1mm
Thickness: 0.3-30mm
Bevel: 0.1-0.3mm X45 Degree
Reflective: >85% or specifed
Coating: Available
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    UV Fused Silica Variable Neutral Density Optical Filter 77mm

    UV Fused Silica Variable Neutral Density Optical Filter 77mm

    Absorption and particularly wavelength selective absorption is an important factor in the function of the filters. The two most commonly used absorbers are thin metallic films which are particularly insensitive to wavelength for absorption and colored glasses which absorb wavelengths varied by as much as several orders of magnitudes in only tens of nanometers. Interference filters are multilayer dielectric thin film devices. Metallic films, colored glasses and thin dielectric films are used in Fused Silica Optics filters.


    ND filters include absorptive and reflective filters,which are used in attenuating lasers and other optical signals. Absorptive filters minimize back reflections, which can be reduced further by adding an antireflection coating to the filter. reflective filters are available with either a BK7 or UV Fused Silica substrate.


    Specification

    Substrate materialUV Grade Fused Silica or BK7
    Diameter25.0 +0~-.025 mm
    Thickness3 ± 0.5 mm
    Min. clear aperture>85% of diameter
    Transmission>90% average within specified range
    Attenuation>99% average within specified range
    Angle of incidence0° ± 5°
    Coating TechnologyElectron beam evaporation, dielectric multilayers
    Surface quality40/20 per MIL-O-13830B
    Wedge<3 minutes
    Wavefront distortion≤1λ @ 633nm per 25mm
    Humidity resistancePer MIL-C-675A
    Abrasion resistancePer MIL-C-675A
    Optimum temperature23°C
    Temperature limits-50°C to 100°C
    CertificationSpectrophotometer print of lot sample
    CleaningNon-abrasive method, isopropyl alcohol on lens tissue recommended
    Laser Induced Damage Threshold(LIDT)>3J/cm2 (1.06μm, 1ns)
    Surface quality20/10 per MIL-O-13830B
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