Descriptions:
MgF2 or
Magnesium Fluoride is positive uni-axial crystal with a very high optical
transmittance from the vacuum UV to IR. It is regularly used for optical
elements where extreme ruggedness and durability is required.
Main
application:
1)
VUV , UV ,IR optical systems
2)
UV photomultiplier tubes
3)
Excimer lasers
4)
Optical fiber communications industry
Advantages:
1)
High optical transmittance from the vacuum ultraviolet to
the infrared spectrum region(0.12～8.5μm).
2)
Resistance to mechanical , thermal shock and radiation
3)
Chemically stable
4)
A positive birefringent crystal
5)
Used for Optical prisms, lenses, wedges, windows, other
optical components etc
Basic
properties of MgF2 crystal:
|
Chemical Formula
|
MgF2
|
|
Density
|
3.18 g/cm3
|
|
Melting Point
|
1255℃
|
|
Boiling Point
|
2239℃
|
|
Molar Mass
|
62.32
|
|
Thermal Conductivity
|
3.15W/m K
|
|
Specific Heat
|
920 J/(kg K)
|
|
Thermal Expansion Coefficient
|
⊥C 9×10–6∥C 14 ×10–6 /
K
|
|
Knoop Hardness
|
415,576 kg/mm2
|
|
Mohs Hardness
|
5--6
|
|
Young's Modulus
|
138.5 GPa
|
|
Shear Modulus
|
54.66 GPa
|
|
Bulk Modulus
|
101.32 GPa
|
|
Rupture Modulus
|
49.6 MPa
|
|
Elastic Coefficient
|
C11=140 C12=89 C44=57 C13=63 C66=96
|
|
Dielectric Constant
|
105 ~107 Hz 5.45
|
|
Solubility in Water
|
0.0076 g / 100 g, 18℃
|
|
Lattice Parameter
|
a=4.64 Å, c=3.06 Å
|
|
Crystal Type
|
Tetragonal, P42/mnm
|
|
Cleavage Planes
|
(100), (110)
|
|
Absorption Coefficient
|
0.07 at 0.2µm,0.02 at 5.0µm
|
|
Poisson's Ratio
|
0.276
|
|
Transmission Range
|
0.11 - 8.5
|
|
Vapor Pressure
|
1 Pa(at 1150℃), 10 Pa(at 1300℃)
|
|
Applications
|
IR, UV , DUV and VUV
|
|
Fluorescence
|
Weak yellow upon excitation at 590 nm
|
HGO offers MgF2
specifications:
|
Orientation:
|
a-cut or <100> ;C-cut or<001>; random (-RM) or as specified
|
|
Wavefront Distortion:
|
λ/6 per inch @ 632.8 nm
|
|
Dimension Tolerances：
|
rods with diameter: +0.0/-0.05 mm , Length: ±0.1
mm
|
|
Surface Quality:
|
20/10 Scratch/Dig MIL-O-1380A
|
|
Parallelism:
|
< 20″
|
|
Perpendicularity:
|
< 10′
|
|
Clear Aperture:
|
> 85%
|
|
Surface Flatness:
|
< λ/6 @ 632.8 nm
|
|
Chamfer:
|
< 0.25 mm @ 45deg.
|
|
Size
|
Upon customer request
|
|
Coating
|
Uncoated or upon customer’s request
|
|
Quality Warranty Period
|
One
year under proper use
|
Why
Choose HGO ?
HG
OPTRONICS.,INC. has the ability to supply high quality MgF2 Magnesium Fluoride Crystal in mass production quantity. Material from HGO
features with high transmittance in VUV(>70%) and UV wavelength ranges. Standard
size for VUV windows are Dia.8 and Dia.6 with 1mm thickness.
HGO offer 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. In addition, we can also produce other types of window crystals like
YAG crystals, BaF2,LiF Crystals, etc.
HGO has a mass-production line for MgF2 crystals and have
wide experiences and strong ability to supply such crystals with large quantity
and in very short delivery time.
