Laser Output Couplers


An Output Coupler is a partially transparent dielectric mirror used in a laser cavity. It has a primary function of transmitting part of the circulating intracavity optical power in order to generate a useful output of the laser.

An Output Coupler's most important property is a degree of transmission, which affects threshold power, laser efficiency, maximum output power, Q-switching instabilities, etc.

Output Couplers often have both surfaces flat but are also available in spherical (concave or convex) configurations.

additionally, the back-side of an Output coupler is coated with a high-efficiency anti-reflective coating.


Flat, spherical or wedged configuration.

Output Couplers are available in almost any kind of configuration: flat, plano/convex or plano/concave, meniscus, wedged, etc. 

Low absorption UV or IR grade fused silica

Bulk absorption plays a critical role in a duty cycle of cavity optics. Substrates for Output Couplers are made of application-optimized low absorption fused silica. 

Optimized for ultrafast applications

Ultrafast output couplers feature negligible GDD, both in reflection and transmission.

Optimized for high power applications

Output couplers, as intracavity components, have to handle extreme energy densities. That is why these coatings are optimized for a high damage threshold, which exceeds 50 J/cm2, 1064 nm, 20 ns.

Back surface AR coated to eliminate ghosting.

The back surface is anti-reflective coated, where residual reflectivity is lower than <0.05%. An AR coating eliminates parasitic reflections from the back surface.

Custom design Custom
  • Flat, spherical or wedged configuration.
  • Single wavelength or broadband design.
  • Reflectance from 10% up to 99.99% with +/-0.05% accuracy.
  • Optimization for ultrafast applications.
  • Diameter from 3 mm up to 360 mm.
  • Spectral range from 200 nm up to 5000 nm.

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