Luoyang Dingming Optical Technology Co.,Ltd.

Magnesium fluoride

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Magnesium fluoride

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Fluoride

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Magnesium fluoride is transparent over an extremely wide range of wavelengths. The effective transmission range is 0.11 µm - 7.5 µm (ultraviolet to infrared). Irradiation does not lead to color centers. Magnesium fluoride is a rugged, hard material which is resistant to thermal and mechanical shock. Considerable mechanical shock is needed to cause cleavage which is near perfect when it occurs. The natural form of MgF2 is known as Sellaite. Magnesium fluoride is a positive birefringent crystal grown normally to 135 mm diameter by vacuum Stockbager technique, seeding along the C-axis. Thin layers of MgF2 are frequently applied to the surfaces of optical elements as part of optical coatings such as anti-reflective coatings.

PARAMETER	VALUE
OPTICAL
Transmission Range	0.11 to 7.5 microns
Refractive Index	N0=1.3836 Ne=1.3957 at 0.405 microns
Reflection Loss	11.2% at 0.12 microns (2 surfaces)
Restrahlen Peak	20 microns
dN/dT	+2.3 and +1.7 x 10-6e/ ℃at 0.4 microns
PHYSICAL
Density	3.177 g/cm3
Melting Point	1255 ℃
Thermal Conductivity	0.3 W/(m K) at 27 ℃
Thermal Expansion	13.7and 8.48 x 10-6e/℃
Hardness	Knoop 415 kg/mm2
Specific Heat Capacity, cal/(g K)	0.24
at 298 K	0.362
Dielectric Constant	4.87 parallel and 5.45 perpendicular
Young's Modulus (E)	138.5 GPa
Shear Modulus (G)	54.66 GPa
Bulk Modulus (K)	101.32 GPa
Elastic Coefficients	C11=140.2 C12=89.5 C44=56.8
	C33=204.7 C13=62.9 C66=95.7
Apparent Elastic Limit	49.64 MPa
Poisson Ratio	0.276