Partial reflecting mirrors (PR)
Partial reflecting mirrors (PR)
| Substrate dimension tolerance | +0/-0,1 mm |
| Substrate wavefront distortion | < λ/8 (< λ/4 for curved surfaces) |
| Substrate surface quality | 20-10 SD; 40-20 SD for curved faces |
| Coating Adhesion and Durability | Per MIL-C-675A |
| Clear Aperture | >90% of diameter |
| Laser Damage Threshold | >5-6 J/cm2 for 10 ns pulses @1064nm |
These coatings serves usually for the efficient beam splitting as well as output coupling in high power laser cavities. Typical Broad band (750-850nm) coatings for R=50% is shown in the picture below.
Coatings are provided by Ion Beam Sputtering (IBS) or Electron beam evaporation with/without Ion assistance coating techniques.
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