These laser cavity output couplers have a reflectance in the range 35-70%. In order to optimize power and spatial profile of the laser beam, the output coupler and end mirror have optical surfaces with well-defined radii of curvature.
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co2-laser-output-couplers - Drawings
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Specifications
Type
Output Coupler
Optic Material
ZnSe
Reflection S1
30% to 70%
Surface Quality
10-5 scratch and dig
Surface Irregularity
0.5 Fringe @ 633 nm
Power
1 Fringe @ 633 nm
Wedge
<3' (arc minutes)
Diameter Tolerance
+0/-0.1mm
Thickness Tolerance
±0.2mm
Features
Output Coupler and End Mirror for CO2 Laser
The output coupler usually has reflectance in the range 40% to 70%. In order to optimize power and spatial profile of the laser beam, the output coupler and end mirror have optical surfaces with well-defined radii of curvature. The output coupler is typically composed of ZnSe in order to minimize absorption and thermal distortion while transmitting a high-power laser beam. The end mirror usually has reflectance 99.5% which means that the transmitted laser beam has low power. However, because absorption in the coating is higher than in the output coupler, substrate materials, such as Germanium or Gallium Arsenide, with high thermal conductivity are used in most lasers.
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