Calcium Fluoride is used for optical windows, drilled discs, lenses and prisms in transmision range 0.15-9�m. Degradation due to to moisture in the atmosphere is minimal, and polished surfaces of the CaF2 windows may be expected to withstand several years exposure to normal atmospheric conditions.

Modulation transferfunctionformula

Since they are nonaxial, CaF2 crystals do not require consideration of axial direction. Because of CaF2 low refractive index, Calcium Fluoride windows can be used without an anti-reflection coating.

We produce the following custom CaF2 optics: CaF2 lenses with any focal length; CaF2 windows up to 220mm diameter; CaF2 wedges, prisms and CaF2 mirrors; Excimer CaF2 optics, Raman grade CaF2 optics and etc. Please send us your specifications, we will quote it within 24hrs. We have own growth facility for CaF2 crystal growth. We grow about 50kg of CaF2 crystals every month. That is why we can offer high quality Calcium Fluoride (CaF2) windows and lenses at very competitive price. Compare our prices now! Simple guide to CaF2 grade: Excimer, VUV, UV, IR. Click here. CaF2 transmission curve. Sample thickness 10mm. Calcium Fluoride is used for optical windows, drilled discs, lenses and prisms in transmision range 0.15-9�m. Degradation due to to moisture in the atmosphere is minimal, and polished surfaces of the CaF2 windows may be expected to withstand several years exposure to normal atmospheric conditions. Since they are nonaxial, CaF2 crystals do not require consideration of axial direction. Because of CaF2 low refractive index, Calcium Fluoride windows can be used without an anti-reflection coating. Calcium Fluoride is attacked by atmospheric moisture at 600�C, where it begins to soften. The top use temperature is 800C, when moisture is not present. Irradiation of Calcium Fluoride windows causes some loss in UV transmission. CaF2 is sensitive to thermal shock. Typical applications: VUV - UV - IR imaging systems, excimer laser windows, CaF2 viewport, demountable cell windows in spectroscopy and all kinds of lenses. Alkor produces CaF2 windows and mirrors for European manufacturers of gas detectors and gas analyzers. Maximum diameter of CaF2 windows by Alkor - 220mm (8"). Alkor manufactures vacuum UV grade CaF2 windows and lenses (193nm and 157nm) upon request. Download CaF2 datasheet in PDF. Chemical Formula CaF2 Crystal Class Cubic, cleaves [111] plane Lattice Constant, � 5.46 Density, g/cm3 (20 �C) 3.18 Molecular Weight 78.08 Dielectric Constant for 105 Hz 6.76 Melting Temperature, K 1630 Thermal Conductivity, W/(m K) at 273 K 10 Thermal Expansion, 1/K at 300 K 18.9 x 10-6 Specific Heat, cal/(g K) at 273 K 0.204 Debye Temperature, K 510 Young's Modulus, GPa 75.79 Rupture Modulus, GPa 0.0365 Shear Modulus, GPa 33.76 Bulk Modulus, GPa 83.03 Poisson's Ratio 0.28 Knoop Hardness, kg/mm2 178 [100], 160 [110] � �m No �m No �m No 0.149 1.5800 0.161 1.5490 0.195 1.5000 0.200 1.4950 0.222 1.4800 0.248 1.4680 0.266 1.4621 0.280 1.4584 0.300 1.454 0.337 1.4481 0.400 1.4419 0.486 1.4370 0.588 1.4339 0.656 1.4325 0.687 1.4320 0.728 1.4314 0.884 1.4298 1.014 1.4288 1.100 1.4283 1.250 1.4275 1.650 1.4256 1.900 1.4244 2.058 1.4236 2.450 1.4214 2.700 1.4199 2.800 1.4192 3.050 1.4175 3.400 1.4149 4.000 1.4096 4.400 1.4057 4.800 1.4014 5.000 1.3991 5.304 1.3952 5.893 1.3871 6.483 1.3782 7.072 1.3681 7.661 1.357 8.251 1.3444 8.840 1.3308 9.429 1.3161 � � � �

Mtf functionin optical

Calcium Fluoride is attacked by atmospheric moisture at 600�C, where it begins to soften. The top use temperature is 800C, when moisture is not present. Irradiation of Calcium Fluoride windows causes some loss in UV transmission. CaF2 is sensitive to thermal shock.

We have own growth facility for CaF2 crystal growth. We grow about 50kg of CaF2 crystals every month. That is why we can offer high quality Calcium Fluoride (CaF2) windows and lenses at very competitive price. Compare our prices now!

Mtf functionformula

Experts in fields like photography state that humans perceive high levels of image sharpness at the 50 percent point. In some other image-dependent scientific fields, however, the 10 percent point is used to determine the resolution of an imaging system.

Modulation transferfunctionimage processing

Note:  “Search Glossary” button searches only the glossary. Temporary note: search not enabled for two- and three-character terms; browse by alphabet.  “Search“ button at the top right of the page searches the Web site, not the glossary. Suggest a term

One approach to measuring this parameter employs a target with black and white bands of increasing spatial frequency (see examples at http://www.normankoren.com/Tutorials/MTF.html). As the bands get closer together, it becomes more and more difficult for an imaging system to reproduce them so that the bands can be distinguished: what had been black and white blurs into gray. On the image of the target, where the frequencies of the bands remain clear and distinct, the MTF is said to be 100 percent. When the contrast falls to one half of its original value, the MTF at that point on the target is 50 percent. Note: There are also other methods for measuring MTF and/or SFR.

Modulation transferfunctionin Ophthalmology

Modulation transferfunctionRadiology

Alkor Technologies manufactures custom Calcium Fluoride optical components for Ultraviolet and Infrared spectrum: CaF2 windows, CaF2 lenses and wedges according your specifications.

Maximum diameter of CaF2 windows by Alkor - 220mm (8"). Alkor manufactures vacuum UV grade CaF2 windows and lenses (193nm and 157nm) upon request.

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Typical applications: VUV - UV - IR imaging systems, excimer laser windows, CaF2 viewport, demountable cell windows in spectroscopy and all kinds of lenses. Alkor produces CaF2 windows and mirrors for European manufacturers of gas detectors and gas analyzers.

Note: In the 2022 revision of the Technical Guidelines for Digitizing Cultural Heritage Materials, SFR is a surrogate metric to MTF. There are some very minor differences between SFR and MTF. In the purest sense SFR may not give the same results due to assumptions about linearity and the response at the zero frequency. For simplicity the Guidelines use SFR as the evaluation metric as SFR is much easier to calculate for field use.

The sharpness of an imaging system can be characterized by its Modulation Transfer Function (MTF), which is generally equivalent to the Spatial Frequency Response (SFR).