Transmittance filters

GOLD provides transmittance filters with these features:

  • Peak wavelength can be selected at wavelengths of 120 nm and longer.
  • Bandwidth can be selected with FWHM of ~ 10 nm and wider
  • Long-wavelength rejection can be selected up to the range of ~ 10-6.

The filters are made with multilayers of Al/MgF2 or Al/AlF3.

The transmittance at the peak wavelength is very dependent on the long-wavelength rejection and on the bandwidth. A larger rejection of the long wavelengths results in a smaller peak transmittance. A narrower band often results in a smaller peak transmittance, but also in a larger long-wavelength rejection.

Here are two examples of filters with a strong rejection of the visible.

Relevant articles

Narrowband filters for the FUV range

Luis Rodríguez-de Marcos; Juan I. Larruquert; José A. Méndez; José A. Aznárez; Liping Fu

Narrowband filters for the FUV range

Luis Rodríguez-De Marcos; Juan I. Larruquert; José A. Méndez; José A. Aznárez; Manuela Vidal-Dasilva; Liping Fu

Filter peaked at 132 nm with a FWHM of 15.2 nm

Filter peaked at 155 nm with a FWHM of 17.6 nm