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MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

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%.


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE




	PARAMETER	VALUE

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


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Wavelength, µm	0.251	0.288	0.300	0.305	0.326	0.357	0.385	0.400	0.420	0.450
Refractive Index	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
Refractive Index	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
Refractive Index	0.955	0.931	0.973	0.979	0.983	0.984	0.985	0.984	0.979


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