Partially Reflective Coating
Output couplers and beam splitters with high-power or cw/fs coating. User-defined angle of incidence.
Coated Laser Optics
Description
Partially reflective coatings are used for substrates, which are used as output couplers or beam splitters in laser systems.
High power dielectric coatings can be manufactured on a standard basis for the wavelength range from 193 nm to 3 µm. For the cw/fs coating this wavelength range extends from 450 nm to 2 µm.
Output Couplers
Ouput couplers are mainly used inside resonators to extract the laser beam. Through a suitable choice of the degree of reflection the quality of the laser resonator is optimized. Output couplers are also commonly used in attenuation. The back side of output couplers is typically equipped with an AR coating to minimize the loss of the transmitted beam.
Output Couplers for Excimer Lasers
For mirrors that are used outside of the excimer laser resonator, the standard coating is usually applied to fused silica substrates. If the mirrors are used inside the resonator, the coatings have to be chlorine or fluorine resistant because they are exposed to the aggressive laser gas. In such a case, it is important to use CaF2 or MgF2 as the substrate material.
Output Couplers for Solid-state Lasers
These coatings are primarily applied to BK7 substrates. For systems with very high power densities, the coatings can also be applied to fused silica.