CaF2 has excellent transmittance between 250nm ~ 7um. It has good light transmittance in the ultraviolet, visible and infrared bands, so it is widely used in laser, infrared optics, ultraviolet optics and high-energy detectors, and its optical performance is especially good in the ultraviolet band.
Low Absorption and High Transmittance:
CaF2 windows exhibit excellent transmittance in the wavelength range of 180 nm to 8 μm, making them suitable for ultraviolet, visible, and infrared spectroscopy applications.
Low Dispersion:
With an Abbe number of 95.31, CaF2 windows demonstrate a very stable refractive index across different wavelengths, making them ideal for imaging applications.
High Damage Threshold:
These windows have a high damage threshold, making them suitable for high-energy laser systems.
Low Fluorescence:
CaF2 windows possess low fluorescence characteristics, making them ideal for optical systems that require low background noise.
| Transmission wavelength | 130nm---10000nm |
| Density(g. cm⁻³) | 3.18 |
| Dielectric constant | 6.76 @1HMZ |
| Melting point(℃) | 1360 |
| Purity (%) | 99.9996 |
| Thermal Expansion Coefficient(1/℃) | 18.85* 10⁻⁶ |
| @373k | 7.3*10-6 |
| Thermal Conductivity(J/k. m. s) | 9.71 |
| Specific Heat (J/g. k) | 0.854 |
| Knoop Hardness(kg/mm2) | 158.3 |
| Young' s Modulus(GPa) | 75.8 |
| Shear modulus(GPa) | 33.77 |
| Poisson' s Ratio | 0.26 |
| Bulk modulus(Gpa) | 82.71 |
| Reflection loss (2side) | 5.4% @ 5000nm |
| Thermo-optical coeffecient. dn/dT(1/℃ ) | -10.6*10⁻⁶ |
| Technical Requirement | Commercial | High Precision | |
| size range | 1-600mm | 2-600mm | |
| Diameter tolerance | 土0.1mm-0.025mm | 土0.02mm | |
| Thickness tolerance | 土0.1mm | ±0.02mm | |
| Parallelism | ±3ˊ | ±5ˊˊ | |
| Surface quality | 60-40 / 40-20 | 20-10 | |
| Surface accuracy | 1.0λ | λ/10 | |
| Bevelling | 0.1-0.5mm*/5° | ||
Free-Space Laser Applications: Due to their low absorption and high damage threshold, CaF2 windows are suitable for free-space laser applications. Their low dispersion (Abbe number 95), low fluorescence, and excellent resistance to water, chemicals, and heat make them perform exceptionally well in these applications.
Excimer Laser Optics:
CaF2 is an ideal choice for excimer laser optics due to its low absorption and high damage threshold. Additionally, its stable refractive index makes it suitable for imaging applications.
UV, Visible, and IR Spectroscopy Applications:
CaF2 is transparent across the ultraviolet, visible, and infrared wavelength ranges, making it suitable for multi-band spectroscopy or fluorescence imaging. Its refractive index is very stable across wavelengths, and it has the lowest group velocity dispersion in the infrared region, making it widely used in femtosecond infrared systems.
Cryogenic Thermal Imaging Systems:
CaF2 windows are commonly used in cryogenic thermal imaging systems due to their excellent thermal conductivity and stability in low-temperature environments.
Protection for Electronic Sensors and Detectors:
CaF2 flat windows are often used to protect electronic sensors, detectors, or other sensitive optical components from saturation or optical damage.
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