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Optical Filters

Interference Filters

Thin-film interference filters for specified transmission and blocking requirements, including narrowband bandpass, IPL cut-on, longpass, and shortpass designs.

  • Germany-based supplier and manufacturing partner
  • Manufacturing to customer specifications
  • Optical inspection and measurement against specified requirements
  • From single components and prototypes to repeat supply
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Assortment of rectangular red and orange interference filters

Product overview

Specifications are defined according to the required filter function and may include center wavelength (CWL) or cut-on/cut-off wavelength, passband transmission, bandwidth, blocking range, optical density (OD), component dimensions, and angle of incidence (AOI).

Interference filters use thin-film coatings to shape transmission and blocking. If the filter function is based on the absorption of a glass material, see our colored glass filters and reference catalog. Material absorption and interference coatings can also be combined, depending on the design.

Configurations

Narrowband bandpass filters

For applications requiring transmission within a defined spectral band and out-of-band blocking.

IPL cut-on filters

For IPL and related optical systems requiring transmission above a specified cut-on wavelength.

Longpass and shortpass filters

For applications requiring wavelength-selective transmission above or below a specified spectral edge.

Representative examples

  1. 910 nm Bandpass Filter

    • Center wavelength (CWL): 910 ± 45 nm
    • Bandwidth: 45 ± 7 nm
    • Peak transmission: > 80%
    • Out-of-band blocking: OD ≥ 4 over the UV–1200 nm range, excluding the passband
    • Effective refractive index: approx. 2
    • Surface quality: 60-40 scratch-dig

  2. 420 nm Cut-On IPL Filter

    • Passband transmission: T > 98% at 420–950 nm
    • Extended NIR transmission: approx. 70–80% at 950–1200 nm
    • Blocking range: 300–420 nm

  3. 535 nm Cut-On IPL Filter

    • Passband transmission: T > 98% at 535–950 nm
    • Extended NIR transmission: approx. 70–80% at 950–1200 nm
    • Blocking range: 300–535 nm

  4. 580 nm Cut-On IPL Filter

    • Passband transmission: T > 98% at 580–950 nm
    • Extended NIR transmission: approx. 70–80% at 950–1200 nm
    • Blocking range: 300–580 nm
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  1. 635 nm Cut-On IPL Filter

    • Passband transmission: T > 98% at 635–950 nm
    • Extended NIR transmission: approx. 70–80% at 950–1200 nm
    • Blocking range: 300–635 nm

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RFQ PREPARATION

What to send for a quote

Please send your drawing or technical specification together with the following information.

  • Filter type, substrate material, dimensions, and thickness
  • CWL or cut-on/cut-off, FWHM, passband transmission, and blocking range / OD
  • Angle of incidence and polarization
  • Required quantity
Request a Quote