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    • 248.6 nm Laser Line Bandpass Filter

    The 248.6 nm laser line bandpass filter is a highperformance narrowband interference filter specifically designed for 248.6 nm KrF excimer lasers. Manufactured on highquality fused silica substrates with multilayer hard dielectric coatings, it offers high transmission at the 248.6 nm laser wavelength while providing excellent rejection of outofband stray light on both sides of the passband, effectively improving the system signaltonoise ratio. The filter is widely used in excimer laser systems, semiconductor lithography, UV Raman spectroscopy, fluorescence detection, UV imaging, and scientific instrumentation.

    Product features：Specifically designed for 248.6 nm KrF excimer lasers；Precise center wavelength, optimized for a single laser line；Narrow FWHM bandwidth of only 1.7 nm；Maximum out‑of‑band blocking depth up to OD₆；Hard dielectric coatings for high environmental stability；Fused silica substrate with excellent UV transmission

    Part Number：MP-LLF-248

    Application area：KrF excimer laser systems | Semiconductor lithography equipment | UV laser processing machines | Laser-induced fluorescence (LIF) | UV Raman spectrometers

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    Main parameters
  • Core parameters

  • Laser Wavelength Transmission Band

    248.6 nm T > 40% 248.6 nm

  • Dimension Drawing
    • General Parameters

    Specification

    Value

    Laser Wavelength

     248.6 nm

    Transmission Band

    T > 40%  248.6 nm

    Blocking Band

    ODabs > 5  228.2-246.1 nm

    Blocking Band

    ODabs > 6  228.7- 244.9 nm

    Blocking Band

    ODabs > 6  252.3-273.5 nm

    Blocking Band

    ODabs > 5  251.1-279.9 nm

    FWHM Bandwidth

    1.7 nm

    Guaranteed Minimum Bandwidth

    Transmission guaranteed for laser wavelength only

    Angle of Incidence

    0 ± 2 °

    Clear Aperture

    ≥ 10 mm

    Transverse Dimensions, Diameter

    12.5mm

    Filter Thickness, Mounted

    3.5mm

    Filter Thickness Tolerance, Mounted

    ± 0.1mm

    Filter Thickness, Unmounted

    2.0mm

    Filter Thickness Tolerance, Unmounted

    ± 0.1mm

    Surface Quality (Scratch-Dig)

    60-40

    Filter Effective Index

    1.77

    Optical Damage Rating

    0.1 J/cm sq. @ 532 nm (10 ns pulse width)

    Orientation

    Arrow on ring is preferred direction of propagation of light

    Substrate Type

    Fused Silica

     

    Spectral Characteristic Curves

     

    Transmittance-Wavelength Spectrum

    图片2.png 

     

     

    Optical Density Spectrum

    图片3.png


    Optional Configurations

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  • Product title: 248.6 nm Laser Line Bandpass Filter
  • Product link: https://www.idealphotonics.com/product/detail/1627.html

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    • 10+ 10 Years of Experience
    • 50 50 + Countries Bussiness
    • 10000 10k + Diodes sold worldwide
    • 30 30+ Invention patent
    • 10 10+ Advanced Optical Solutions

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