These copper polarize lock total reflectors are quite similar to turning mirrors. However, durability of the coating is more critical because the total reflectors are exposed to the gas discharge and the extremely high laser power density inside the cavity. Therefore, the coating must have best-possible environmental resistance and low absorption in order to minimize thermal distortion.
Achieves a truly stable “locked” polarization
High thermal conductivity Copper (Cu) substrate
Durable coating for best-possible environmental resistance
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co2-laser-copper-polarize-lock-mirrors - Drawings
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Specifications
Type
Polarize Lock Mirror
Optic Material
Copper (Cu)
Angle of Incidence
45°
Surface Quality
10-5 scratch-dig
Surface Irregularity
1 Fringe @ 633 nm
Power
2 Fringes @ 633 nm
Wedge
<3' (arc minutes)
Diameter Tolerance
+0/-0.12 mm
Thickness Tolerance
±0.1 mm
Features
Polarize Lock Mirrors
Laser resonators rely on small differences in the reflectivity of fold mirrors for different polarization states to give a stable linearly polarized output. In some cases, the small reflection gaps of the total reflector mirror coatings are not enough to keep the polarization from fluctuating. Using specific properties of the materials selected in optical coating design, we are able to increase the differences in the reflection of S-polarization compared to P-polarization and achieve a truly stable “locked” polarization.
Polarize Lock Mirror Coatings
The PLM-HR mirror coating provides optimized S-Pol reflection (>99.90% for S-Pol), with low enough P-Pol reflection (<93% P-Pol) to enable effective phase locking while still reflecting maximum reflection at the desired S Polarization. It is internal cavity radiation resistant, suitable for both Cu and Si mirrors and can be used in a variety of different resonator type.
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