Partial reflecting mirrors (PR)
Description
Partial reflecting mirrors (PR) provide required percentage reflection/transmission at a specific angle of incidence both for the single wavewlength and over the broad band wavelength range.
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.
The measured transmission curve for PR coating (R = 10% @ 1000-1070 nm) |
Standard Specifications
| Clear Aperture
|
>90% of diameter
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| Coating Adhesion and Durability
|
Per MIL-C-675A
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| Substrate surface quality
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20/10 SD; 40/20 SD for curved faces
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| Substrate wavefront distortion
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< L/8, < L/4 for curved surfaces
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| Substrate dimension tolerance
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+0/-0,1mm
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| Laser Damage Threshold |
>5-6 J/cm2 for 10 ns pulses @ 1064 nm |
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