Products
Filter

The following coatings are available:

• edge filters (short pass or long pass filters)
• band pass filters
• narrow band filters
• dichroic filters
• thermal insulation filters
• neutral density filters (gray filters)
• angle-dependent laser attenuators
• filters with multiple function ranges
• custom filters according to customer requirements

Nearly all types of mineral glass and crystal are suitable for coating.
The substrates are usually supplied by the customer.
If required, filters can also be offered as complete solutions.

Coatings are deposited using conventional (e-beam) or
ion plating technology,  depending on the specifications:


Properties
Conventional (e-beam)

• wavelength range 0.24 µm to approx. 2 µm 
• high laser damage thresholds
• low absorption (except gray filters)
• low stess layers
• also suitable for sensitive substrates
• economical production

Properties
Ion Plating

• for wavelength range 0.19 µm to approx. 5 µm 
• for extremely demanding optical requirements (for example exact and steep edges or high transmission in bandpass region etc.)
• long-term stability of optical and mechanical coating properties regardless of environmental influences (e.g. temperature, pressure, radiation etc.)
• suitable for demanding substrate surface flatness specifications
  (achieved with compensation coating on rear with any desired optical function. Prerequisites: Coplanar substrate, polished on both sides)
• extremely low absorption and scatter losses
• narrow band filter with high transmission and tightly toleranced band edges
• gas and water-free coatings for high power levels, especially in NIR range (e.g. 2.94 µm)
• highly resistant to thermal stress (up to 550°C on quartz glass or sapphire)
• suitable for extreme environmental conditions (e.g. space qualified, salt water resistant) and large mechanical stresses (extremely hard and abrasion resistant)