Ultra-Hard-Coated filters

Ultra-Hard-Coated filters are DELTA\’s latest technical advance in optical thin films components

Already in 2005, DELTA successfully managed to produce optical filters with the Ultra-Hard-Coating technology. DELTA has then lead the way towards an ever increasing complexity and performance of optical filters.

What is an Ultra-Hard-Coated filter?

Ultra-Hard-Coated (UHC) filters are produced with an advanced plasma process that enables a much higher packing density than traditional hard coatings.

The coating is deposited on one single substrate and hence does not make use of glue. The resulting filter is exceptionally robust and can stand intense light and humidity without losing its performance.

The graph below shows the extreme stability and robustness of the Ultra-Hard-Coated filter. After having undergone an environmental test, the spectrum of our UHC filter is not altered.


Environmental-test--JPG (200x0)

Environmental test performed on a UHC filter.

The SEM (Scanning Electron Microscope) picture taken at a x31695 magnification shows the perfect surface and density of the UHC surface that makes DELTA\’s Ultra-Hard-Coated filters the best and most robust filters you can find on the market.


SEM picture of the surface of a UHC filter.

The advantages of the smooth surface feature

  • Reduced stray light.
  • No voids: shift-free coating.

The advantages of Ultra-Hard-Coated filters

  • Best spectral stability (no spectral drift).
  • Increased lifetime.
  • Excellent adhesion of the coating on the substrate.
  • Possibility of depositing very thick layers and increased complex functions.
  • Optimal mechanical stability.
  • Minimal water uptake.

Did you know that DELTA was amongst the first to introduce
Ultra-Hard-Coated technology to optical filters?

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