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HR Laser Line mirrors (HR) Description HR laser line mirrors (HR) provide optimized performance at certain wavelength and certain angle of incidence (AOI). Mirror consists of substrate and multilayer coating stacks which help to achieve very high reflectivity at specific laser line wavelength at any designed angle of incidence. Laser line HR coatings are used for external beam manipulation applications where even slight losses may be intolerable. Coatings are provided by electron beam evaporation with/without ion assistance coating technique. E-beam HR coatings are the most common dielectric coatings in laser optics market as this technology was leading for few decades, and only in recent years this technology started facing competition from other technologies.
Standard specifications Diameter tolerance
+0/-0.1 mm
Thickness tolerance
±0.1 mm
Clear aperture
>90 %
Surface quality
20-10 S-D
Surface flatness
<λ/8@632.8 nm
Protective chamfers
<0.25 mm x 45°
Features • Provide an optimised performance at certain wavelength and certain angle of incidence (AOI) • “Coatings are provided by ion beam sputtering (IBS) or electron beam evaporation with/without ion assistance coating techniques” • HR laser line coatings (HR) highly reflect wavelength range of <10 % of the central wavelength (CWL). For instance, HR @ 800 nm will reflect wavelength range of 760-840 nm • Various dimensions are available on request • Mass production capabilities: 1’000 pieces per month • Custom coatings are available for any wavelenght in range 0.19 - 20 μm T (%) 4
Coating adhesion and durability Per MIL-C-675A Laser damage threshold
>5-7 J/cm 2 for 10 ns pulses @ 1064 nm
S Pol P Pol
3
2
Optomechanics
1 0 900
950
1000
1050
Wavelength (nm) 52
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1150