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Femtoline Laser Output Couplers

Low Group Delay Dispersion (GDD)

An output is a partially reflecting dielectric mirror used in a laser cavity. It trasmits a part of the circulating intracavity power for generating a useful output from the laser.

A low transmission output coupler leads to low laser threshold, and possibly to poor laser efficiency if the losses due to output coupling do not dominate other parasitic losses in the laser cavity. The output coupler transmission is often chosen to maximize the output power, although its optimum value may be lower or higher if there are other design purposes (minimizing intracavity intensities or suppressing Q-switching instabilities in a passively mode-locked laser).

The standard substrates are parralel within 30 arcsec. If you need wedged substrates, please, choose from Wedge Prisms.

UV grade Fused Silica
S1 Surface Flatness
λ/10 typical at 633 nm
S1 Surface Quality
20-10 scratch & dig (MIL-PRF-13830B)
S2 Surface Flatness
λ/10 typical at 633 nm
S2 Surface Quality 20-10 scratch & dig (MIL-PRF-13830B)
Diameter Tolerance
+0.00 mm-0.12 mm
Thickness Tolerance
30 arcsec
0.3 mm at 45° typical


Electron beam multilayer dielectric
Adhesion and Durability
Per MIL-C-675A. Insoluble in lab solvents
Clear Aperture
Exceeds central 85% of diameter
Angle of Incidence
Parallelism 30 arcsec
Back Side Antireflection Coated R<0.25%
Laser Damage Threshold >100 mJ/cm2, 50 fsec pulse, 800 nm typical