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SiC Silicon Carbide - Scanning mirrors

Lightweight optics made of Silicon Carbide are a perfect combination of material properties and polishing technologies. This ceramic material offers high stiffness, thermal stability and good thermal properties. SiC is a non-toxic replacement for Beryllium in high speed laser scanning systems without lowering the dynamic performance of the system.

High precision mirrors are the key components for laser processing in scanheads. The beam position is controlled by two mirrors, and the lightness of the mirrors enables fast motion of the beam on the surface. The mechanical design of the mirror is based on weight, stiffness, thermal dissipation and moment of inertia.

We offer silicon carbide optics in plano / plano only. Coating options depend on the wavelength of operation. For a scanning system at 10.6 µm we recommend our high power CO2 coating for maximum reflection. YAG scanning applications should be coated with our 1064 nm dilectric coating system.

For low power applications protected silver or protected gold are a suitable alternative. This coatings offer a broadband reflection but adsorb more incoming light.

Silicon Carbide Material Properties

_Density [g/cm3]   > 3,16
_Compressive strength RS [MPa]   2200
_Flexural strength, 4-pt bending s [MPa]   510 (25 °C)
_Young‘s modulus E [GPa]   420
_Poisson ratio µ   0,17
_Knopp hardness HK [GPa]   2450
_Fracture toughness KIC [MPa vm]   4
_Thermal conductivity ? [W/mK]   150
_Coefficient of thermal expansion a [10-6 K-1]   4,1 (500°C)

_Brochure Scanning Optics | Download

CO2 Laser Spiegel
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