Descriptions:
CaF2 or Calcium
Fluoride is a cubic crystal with an excellent transmission from 130 nm to 10 μm
and has widespread applications as transparent windows in the ultraviolet and
infrared spectra.Calcium fluoride(CaF2) is a very important optical functional crystal, which has
good optical properties, mechanical properties and chemical stability. It can
be used as optical crystal, laser crystal and inorganic scintillation crystal.
It has a wide transmittance range (0.125-10 μm), and is widely used as optical
medium from vacuum ultraviolet to mid infrared. CaF2 crystal is an
ideal optical material for achromatic lenses because of its special refractive
index and relative dispersion. At present, deep UV excimer laser lithography is
developing from 193 nm to 121 nm. CaF2 single crystal has the advantages of good ultraviolet
transmittance, high laser damage resistance threshold, low stress birefringence
and high refractive index, which makes it the best choice for the research of
deep UV excimer laser lithography. In terms of laser applications, laser diode
pumped CaF2 crystals
activated by Er3+, Tm3+, Yb3+ and other
3-valent rare earth ions were obtained at room temperature.
Main
application:
1)
VUV , UV ,IR optical systems
2) CaF2 crystals used for stable femtosecond white light
generation from UV to IR.
Basic
properties of CaF2 crystal:
|
Chemical Formula
|
CaF2
|
|
Maximum Size
|
φ180mm
|
|
Transmission range (um)
|
0.15-9.0
|
|
Density (g/cm3)
|
3.18
|
|
Melting Point (℃)
|
1418
|
|
Mohs Scale of Mineral Hardness
|
4
|
|
Thermal Expansion Coefficient (10-6/K)
|
16.2-19.4
|
|
Thermal Conductivity
|
9.17
|
|
Dissolubility (g/cm3)
|
0.0016
|
|
Wavelength (um)
|
0.2
|
|
Refractive Index
|
1.4951
|
|
Wavelength (um)
|
0.2; 0.5; 1.0; 5.0; 10.0; 12.0
|
|
Refractive Index
|
1.4951; 1.4365; 1.4289; 1.3990;
1.3002; 1.2299
|
|
Absorption Coefficient (cm-1)
|
0.10@0.2um; 0.01@0.4um;0.03@2.7um
|
HGO offers CaF2
specifications:
|
Orientation:
|
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 CaF2 or Calcium
Fluoride Crystal in mass production quantity. Material
from HGO features with high transmittance in UV and IR wavelength ranges. HGO offer
supplies [001] cut (i.e. the surface is perpendicular to the [001] axis) high
quality CaF2 windows for continuum generation. CaF2 windows cut along a random orientation and
polycrystalline CaF2 windows are also available.
In addition, we can also produce other types of window crystals like YAG
crystals, BaF2, MgF2,LiF Crystals, etc.
HGO has a mass-production line for CaF2 crystals and have
wide experiences and strong ability to supply such crystals with large quantity
and in very short delivery time.
