Calcium Fluoride (CaF2) Windows
Broad Transmission Range: High average transmission from deep UV to near IR (180 nm to 8 µm) makes CaF2 windows versatile for various applications.
Low Absorption Coefficients: Ensures minimal signal loss and high optical efficiency.
Low Chromatic Dispersion: Minimizes the spreading and distortion of light, maintaining high-quality optical signals.
High Damage Threshold: Suitable for high-power laser applications.
Chemical Resistance: Durable and resistant to chemical corrosion, suitable for harsh environments.
Low Group Velocity Dispersion (GVD): Ideal for femtosecond IR lasers, providing superior performance.
Applications: Spectroscopy, fluorescence imaging, thermal imaging, excimer lasers, femtosecond IR lasers, etc.
Calcium Fluoride (CaF2) Windows from Kingwin Optics are designed to deliver exceptional performance across a broad range of applications, spanning deep ultraviolet (UV) to near-infrared (IR) spectra (180 nm to 8 µm). These windows offer high transmission, low absorption, and minimal signal loss, making them ideal for a variety of optical systems.
Key Properties of Calcium Fluoride Windows:
| Materials | IR Grade Calcium Fluoride Crystals |
| Aperture | >90% |
| Dimension Tolerance | +0.0/-0.2mm |
| Thickness Tolerance | +/-0.1mm |
| Surface Quality | 60/40 S/D |
| Chamfer | 0.3-0.5mmx45degree |
| Transmission Range | 0.13 to 10 μm |
| Refractive Index | 1.39908 at 5 μm (1) (2) |
| Reflection Loss | 5.4% at 5 μm |
| Absorption Coefficient | 7.8 x 10-4 cm-1 @ 2.7 μm |
| Reststrahlen Peak | 35 μm |
| dn/dT | -10.6 x 10-6 /°C (3) |
| dn/dμ = 0 | 1.7 μm |
| Thermal Conductivity | 9.71 W m-1 K-1 (4) |
| Melting Point | 1360°C |
| Hardness | Knoop 158.3 (100) with 500g indenter |
| Thermal Expansion | 18.85 x 10-6 /°C (5)(6) |
| Dielectric Constant | 6.76 at 1MHz (7) |
| Specific Heat Capacity | 854 J Kg-1 K-1 |
| Density | 3.18 g/cc |
| Youngs Modulus (E) | 75.8 GPa (7) |
| Shear Modulus (G) | 33.77 GPa (7) |
| Bulk Modulus (K) | 82.71 GPa (7) |
| Elastic Coefficients | C11 = 164 C12 = 53 C44 = 33.7 (7) |
| Apparent Elastic Limit | 36.54 MPa |
| Poisson Ratio | 0.26 |
| Solubility | 0.0017g/100g water at 20°C |
| Molecular Weight | 78.08 |
| Class/Structure | Cubic (111) cleavage |
Advantages of Calcium Fluoride Windows:
- Broad Transmission Range: High average transmission from deep UV to near IR (180 nm to 8 µm) makes CaF2 windows versatile for various applications.
- Low Absorption Coefficients: Ensures minimal signal loss and high optical efficiency.
- Low Chromatic Dispersion: Minimizes the spreading and distortion of light, maintaining high-quality optical signals.
- High Damage Threshold: Suitable for high-power laser applications.
- Chemical Resistance: Durable and resistant to chemical corrosion, suitable for harsh environments.
- Low Group Velocity Dispersion (GVD): Ideal for femtosecond IR lasers, providing superior performance.
Coating Options:
To further enhance the performance of CaF2 windows, Kingwin Optics offers a variety of protective coatings:
- Anti-Reflection (AR) Coatings: To maximize transmission and reduce reflections.
- Custom Coatings: Tailored to specific wavelength ranges and application requirements.
Applications:
- Spectroscopy: High transmission and low absorption make CaF2 windows perfect for precise spectroscopic measurements.
- Fluorescence Imaging: Minimal chromatic dispersion ensures high-quality imaging.
- Thermal Imaging: Suitable for use in MWIR (3-5 µm) thermal imaging systems.
- Excimer Lasers: Uncoated CaF2 windows are excellent for high-power UV laser applications.
- Femtosecond IR Lasers: Low GVD makes CaF2 ideal for ultra-fast laser applications.
Custom and Assembled Solutions:
Kingwin Optics provides custom Calcium Fluoride Windows, including:
- Uncoated Window Substrates: Ideal for excimer lasers.
- Protective Coated Windows: For enhanced durability and performance.
- Assembled Windows with Metal Holders: For easy integration into optical systems.
Calcium Fluoride Windows from Kingwin Optics provide superior performance for a wide range of optical applications. With their broad transmission range, low absorption, high damage threshold, and excellent chemical resistance, these windows are ideal for spectroscopy, imaging, laser systems, and more. Customizable dimensions and coatings ensure that your specific needs are met with precision and quality.
