MgF2 Crystals

MgF2 (Magnesium Fluoride) is a 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 a-cut (or [100] cut) MgF2 crystals for the maximum birefringence. c-cut (or cut along the optical axis) with the minimum birefringence, or 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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Model	Name	material	aperture	thickness	Price	Availability	Action
MGF0001-A	MgF2 crystal window, Dia. 0.5"x0.1mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 0.5"	0.1mm	Ask	Out Of Stock
MGF0005-A	MgF2 crystal window, Dia. 0.5"x0.5mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 0.5"	0.5mm	USD$279.00	Out Of Stock
MGF0010-A	MgF2 crystal window, Dia. 0.5"x1.0mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 0.5"	1.0mm	USD$309.00	Out Of Stock
MGF1002-A	MgF2 crystal window, Dia. 1"x0.2mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 1"	0.2mm	Ask
MGF10025-C	MgF2 crystal window, Dia. 1"x0.25mm, C-cut, both surfaces polished and uncoated	MgF2	Dia 1"	0.25mm	USD$409.00
MGF1005-A	MgF2 crystal window, Dia. 1"x0.5mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 1"	0.5mm	USD$409.00
MGF25005-RM	MgF2 crystal window, Dia. 25.0x0.5mm, Rondom cut, both surfaces polished and uncoated	MgF2	Dia 25.0mm	0.5mm	Ask
MGF1010-A	MgF2 crystal window, Dia. 1"x1.0mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 1"	1.0mm	USD$409.00
MGF1020-A	MgF2 crystal window, Dia. 1"x2.0mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 1"	2.0mm	USD$409.00
MGF1020-RM	MgF2 crystal window, Dia. 1"x2.0mm, Random cut, both surfaces polished and uncoated	MgF2	Dia 1"	2.0mm	USD$299.00
MGF1030-A	MgF2 crystal window, Dia. 1"x3.0mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 1"	3.0mm	Ask
MGF1050-A	MgF2 crystal window, Dia. 1"x5.0mm, A-cut, both surfaces polished and uncoated	MgF2	Dia 1"	5.0mm	Ask
LIF1020-A	LiF crystal window, Dia. 1"x2.0mm, A-cut ( <100>-cut ), both surfaces polished and uncoated	LiF	Dia 1"	2.0mm	USD$299.00

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Basic Properties of MgF₂ Crystal

Transparency Range: 130 - 9000 nm			Transmission Curve (uncoated)
Crystal Symmetry: Tetragonal
Lattice Constants: a= b=4.621Å; c=3.053Å
Density: 3.18 g/cm³
Thermo-Optic Coefficients (@20 deg, 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	0.0088	-0.37°
2500	1.3642	1.3752	0.0110	-0.45°
1064	1.3731	1.3847	0.0116	-0.48°
800	1.3750	1.3867	0.0117	-0.48°
632.8	1.3770	1.3888	0.0118	-0.49°
532	1.3789	1.3907	0.0119	-0.49°
355	1.3869	1.3991	0.0122	-0.50°
266	1.3989	1.4116	0.0127	-0.52°

Specifications of MgF2 Windows:

Orientation:	a, c, random (-RM) or as specified
Dimension Tolerance:	±0.1 mm
Clear Aperture:	> 85%
Parallelism:	< 1 arc min.
Flatness:	λ/6 @ 632.8nm
Surface Quality:	20/10 Scratch and Dig
Transmission Wavefront Distortion:	< λ/6 @632.8 nm
Bevel:	< 0.25 mm X 45°