OPTICS CRYSTALS LASERS
   
 
Copper (Cu)

Oxygen free high quality copper (OFHC) is used as a substrate material for the IR laser mirrors including cooled ones for the high-power laser systems.

Copper features high thermal conductivity to ensure maximum beam quality under extreme stress. Copper mirrors should also be well heatsinked. They are not recommended for low power applications since they are difficult to polish and, consequently, not inexpensive. Copper is also very soft material and scratches very easily. Great care must be taken when cleaning these mirrors even though they are coated with protective coating. 99.97% of pure copper is contained in OFHC and maximum quantity of oxygen does not exceed 0.001%.












BASE PROPERTIES

PARAMETER VALUE
OPTICAL  
  Thermal Radiation Coefficient   0.025 at 3 - 20 µm at 293 K  
  Threshold of surface destruction   21 ... 24 J/cm2 at 10.6 µm, t =1.5 ms, E=500 J  
  Index of Absorption   0.0123 cm-1 at 10.6 µm at 293 K  
     
PHYSICAL  
  Density   8.90 g/cm3 at 293 °C  
  Melting Point   1353 ... 1359 °C  
  Heat of Melting   209 ... 217 kJ/kg  
  Thermal Conductivity   399 Wm-1K-1 at 293K  
  Thermal Expansion   16.6 x 10-6/°C at 293 °C  
  Brinell Hardness   450 ... 1100 MPa  
  Specific Heat Capacity   384 J/(kg K) at 293 °C  
  Young’s Modulus (E)   129.5 GPa  
  Shear Modulus (G)   45.5 GPa  
  Poisson Ratio   0.350  
  Resistivity   1.724 µ 10-6 Ohm x cm at 293 K  

REGULAR REFLECTANCE

  Wavelength, µm 0.251 0.288 0.300 0.305 0.326 0.357 0.385 0.400 0.420 0.450  
  Regular Reflectance 0.259 0.243 0.250 0.253 0.249 0.273 0.286 0.310 0.327 0.370  
  Wavelength, µm 0.488 0.500 0.550 0.600 0.650 0.694 0.760 0.800 1.060    
  Regular Reflectance 0.430 0.440 0.477 0.718 0.800 0.830 0.831 0.886 0.901    
  Wavelength, µm 2.000 3.000 4.00 5.00 7.00 9.00 10.60 11.00 14.00    
  Regular Reflectance 0.955 0.931 0.973 0.979 0.983 0.984 0.985 0.984 0.979    

 



 
 
 
Mirrors


High Power Laser Cu copper mirror with hole

High Power Laser Cu copper mirror with hole 2

Ordering Info
 
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+7 (495) 234-5951, 234-5952, 956-7610
fax +7 (495) 433-1551
sales@crystaltechno.com
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