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Molybdenum (Mo) Mirrors for CO2 Lasers

Features:

  • Highest optical damage threshold
  • High anti-corrosion stability
  • Hard and extremely scratch-resistant, stable surface with unrestricted cleanability
  • Low absorption and scattering losses: < 2%
  • High thermal conductivity: 138 W/mK
  • High IR reflectivity: > 98%
  • Surface finish: 20/10 scratch/dig; < 20 Angstroms

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Specifications:

Reflectivity R≥98% at 10.6μm Diameter Tolerance +0.0/-0.1mm
Thickness Tolerance +/-0.1mm Surface Quality 60/40 S/D
Wedge <3 arc minutes Surface Figure λ/20@10.6mm over f50mm
Clear Aperture 90% of diameter Laser Damage Threshold 60KW for f10mm (6000W/mm)
 

Modules or Types:

Following modules and types of the Molybdenum mirrors are available in stock:

Diameter (mm) Thickness(mm) Substrate Materials Reflections at 10.6μm
12 3 Molybdenum R≥98% at λ=10.6μm
18 3 Molybdenum R≥98% at λ=10.6μm
19 3 Molybdenum R≥98% at λ=10.6μm
20 3 Molybdenum R≥98% at λ=10.6μm
25 3 Molybdenum R≥98% at λ=10.6μm
25.4 3 Molybdenum R≥98% at λ=10.6μm
30 3 Molybdenum R≥98% at λ=10.6μm
38.1 3 Molybdenum R≥98% at λ=10.6μm
50.8 3 Molybdenum R≥98% at λ=10.6μm
75 3 Molybdenum R≥98% at λ=10.6μm

Uncoated solid Molybdenum ("Moly") mirrors are simply the toughest, most durable, longest lasting laser mirrors available. Molybdenum has the lowest thermal expansion of any commercially used metal, and will withstand extreme temperatures without significantly expanding or softening. It has a Melting Point of 2,623 °C (4,753 °F). For infra red uses, polished uncoated Molybdenum has a high natural broad band reflectivity, approx 98%. Molybdenum mirrors need no coating; the extremely hard surface resists weld spatter, fumes, smoke and process debris. Molybdenum mirrors can be scrubbed with brushes, soak cleaned in organic solvents or detergents repeatedly.

Finally, the phase shift on reflection is very low and reliable (1 degree or so for CO2 laser) eliminating polarisation issues that interfere with sheet metal cutting. Molybdenum is useful where a mirror has to be used facing upwards, and prone to collecting dirt and dust.