OPTICS CRYSTALS LASERS
   
 
Material - Molybdenum (Mo)

Molybdenum is the clear choice for general purpose CO2 — laser mirror substrates.It is the most durable with comparison to silicon and copper and is recommended for industrial environments where dirt and dust can cause severe problems with other types of mirrors.

Molybdenum features high reflectivity, low thermal expansion and extreme hardness. The reflectivity of uncoated molybdenum is quite high at 10.6 microns (>98%), and these mirrors are offered coated and uncoated. Uncoated molybdenum mirrors represent the best choice for applications where ultimate reflectivity is not paramount, but where durability is. Uncoated molybdenum is a fairly durable surface and can withstand considerably more rigorous cleaning than silver reflective coating having protection.






BASE PROPERTIES

PARAMETER VALUE
OPTICAL  
  Reflectivity   More 98% at 10.6 microns
  Thermal Radiation Coefficient (Emissivity Coefficient)   0.027 at 10 microns, at 293 K  
PHYSICAL  
  Density   9.01 —10.5 g/cm3 at 293K  
  Melting Point   2883 — 2898 K  
  Heat of Melting   197.8 — 287 kJ/kg  
  Thermal Conductivity   135 — 162 W/(m K) at 293K  
  Thermal Expansion   5.07 x 10-6/K at 293K  
  Specific Heat Capacity   244 J/( kg K) at 293K  
  Brinell Hardness   1500 — 2300 MPa  
  Young’s Modulus (E)   260 — 350 GPa  
  Shear Modulus (G)   118.1 — 140 GPa  
  Poisson’s Ratio   0.31  
  Resistivity   4.0 — 5.6 x 10-6 Ohm x cm at 300 K  

REGULAR REFLECTANCE

  Wavelength, microns

0.50

1,0 1.5 2.0 2.5 3.0

4.0

4.5 5.0 10.60  
  Regular Reflectance 0.95 0.84 0.58 0.58 0.58 0.57 0.63 0.66 0.70 0.982  

 



 
 
 



Ordering Info
 
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