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Nd:YAG Laser Output Couplers

Laser Output Couplers transmits a part of the circulating intracavity power for generating a useful output from the laser. A low transmission output coupler leads to a low laser threshold, but also possibly to  poor laser efficiency if the losses due to output coupling do not dominate over other parasitic losses in the laser cavity. The output coupler transmission is often chosen to maximize the achieved output power, although its optimum value may be lower or higher if there are other design purposes (minimizing the intracavity intensities or suppressing Q-switching instabilities in a passively mode-locked laser).

UV grade fused silica or BK7 glass
S1 Surface Flatness
λ/10 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
Damage Threshold
>3 J/cm2, 8 ns pulse, 1064 nm typical for BK7 substrates;
>6 J/cm2, 8 ns pulse, 1064 nm typical for UVFS substrates.
Coated Surface Flatness
λ/10 at 633 nm over 85% over clear aperture
Angle of Incidence
0°-8° (normal)
Back side antireflection coated R<0.2%