MgF2 Windows

MgF2 (Magnesium Fluoride) is positive uniaxial crystal with a very high optical transmittance from the vacuum UV to IR. It also has a large resistance to mechanical and thermal shock, to optical radiation, and is chemically stable, making it a very useful materials for UV and IR optics.

Newlight Photonics offers both a-cut (or [100] cut) MgF2 windows for the maximum birefringence and c-cut (or cut along the optical axis) with the minimum birefringence. Random-cut (cut along a random axis) MgF₂ windows are also available. The thickness can be made as thin as 0.1mm.

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Part No.	Description	Application	Material	Wavelength	Bandwidth	Size	Aperture	Thickness	Length	Angle	Doping	Orientation	Displacement	Retardation	Delay	Coating	End cut	Holder	Price	Availability	Add to Cart

Basic Properties of MgF₂ Crystal

Transparency Range: 130 - 9000 nm			Transmission Curve
Crystal Symmetry: Tetragonal
Lattice Constants: a= b=4.621 Å; c=3.053 Å
Density: 3.18 g/cm³
Thermo-Optic Coefficients (@20 degC, 632 nm) dno/dT= 1.1 x 10^-6 /^oC dne/dT= 0.58 x 10^-6/^oC
Optical Homogeneity: Δn < 10^-6/cm
Mohs Hardness: ~ 5
Thermal Conductivity: 11.6 W/m/K
Thermal Expansion Coefficients:			α_a = 13.8 x 10^-6 /K α_c = 8.5 x 10^-6 /K
Sellmeier Equations (λ in µm): n_o²=1+0.48755λ²/(λ²-0.00188) + 0.39875λ²/(λ²- 0.00895)+2.31204λ²/(λ²- 566.136) n_e²=1+0.41344λ²/(λ²-0.00136) + 0.50498λ²/(λ²- 0.00824)+2.49045λ²/(λ²- 565.108)
Wavelength (nm)	n_o	n_e	Birefringence (Δn=n_e-n_o)	Walk-off Angle at 45°
5000	1.3340	1.3428	0.023	-0.37°
2500	1.3642	1.3752	0.030	-0.45°
1064	1.3731	1.3847	0.032	-0.48°
800	1.3750	1.3867	0.032	-0.48°
632.8	1.3770	1.3888	0.032	-0.49°
532	1.3789	1.3907	0.033	-0.49°
355	1.3869	1.3991	0.034	-0.50°
266	1.3989	1.4116	0.035	-0.52°

Specifications of MgF2 Windows:

Orientation:	a, c, random (-RM) or as specified
Dimension Tolerance:	±0.1 mm
Clear Aperture:	> 85%
Parallelism:	< 3 arc min.
Flatness:	λ/6 @ 632.8 nm
Surface Quality:	20/10 Scratch and Dig
Transmission Wavefront Distortion:	< λ/6 @632.8 nm
Bevel:	< 0.25 mm X 45°

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