For some optical components non-transparent fused silica can be used.
A diffusor with a performance close to the ideal diffusor has many applications, be it in reflection or transmission orientation. Heraeus HOD® offers very good performance over a broad angular distribution, is easy to clean, machinable, inert as transparent fused silica and can be made resistant to UV radiation.
More information on HOD
Another non-transparent optic component is an absorber. Heraeus has developed a special fused silica, that is intentionally doped to absorb over a broad wavelength region. It appears black and is frequently used in spectroscopy applications. If cut very thin, it can be used as a strong attenuator for high intensity radiation.
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