Shortpass Filter (SPF)

  • more than 40 types of Shortpass Filter in Stock
  • Cutoff Wavelength from 360 ~ 1650nm available
  • Standard mount of dia12.5mm and dia25.4mm for easy assembly
  • Custom Cut available for different size of Filters

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What is a Shortpass Filter?

Shortpass Filter allow shorter wavelength to pass through while blocking longer wavelength.

For example, SP600 will allow 400-590nm light to go through while blocking 610-1200nm light.

You can use below interactive demo to simulate shortpass filter with different cutoff wavelength,

Specifications of Shortpass Filter

  • Cutoff Wavelength

    The wavelength point where shortpass filter hit 50% of its peak transmission.

  • Blocking Region

    The wavelength region where you do not want the light go through.

    example: OD5@600-900nm

  • Optical Density

    The attenuation of light in the blocking region.

    example: OD4 means in the blocking region transmit should lower than 0.01%

  • Transmit Region

    The wavelength region where shortpass filter transmit light.

    Usually in UV-VIS range.

  • Transmittance

    The transmission ratio in transmit region.

    Usually an average value over the range.

  • Transition Area

    The area between transmit region and blocking region. Smaller transition area means better performance.

    (Usually called "Sharp Edge")

What's the purpose of using a shortpass filter?

You can select the light over an area.(Usually in UV-VIS range)

For example, you can have a Mercury Arc Lamp which emit light from 254nm to 579nm.

By applying a SP395nm filter (Cutoff at 395nm), You can have all the emission line in UV range, while removing the VIS part.

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