Description
SHAPE OPTICS Calcium Fluoride (CaF2) Vacuum UV Grade Window Specifications
| Parameter | Specification |
|---|---|
| Abbe Number (v_d): | 94.99 |
| Bevel: | Protective as needed |
| Clear Aperture CA (mm): | – |
| Clear Aperture (%): | 90 |
| Diameter (mm): | +0.0/-0.1 |
| Thickness (mm): | ±0.1 |
| Coating: | VIS-NIR (400-1000nm) |
| Coating Specification: | R_abs ≤0.25% @ 880nm<br>R_avg ≤1.25% @ 400 – 870nm<br>R_avg ≤1.25% @ 890 – 1000nm |
| Density (g/cm³): | 3.18 |
| Coefficient of Thermal Expansion CTE (10^-6/°C): | 18.85 |
| Edges: | Fine Ground |
| Index of Refraction n_d: | 1.434 |
| Knoop Hardness (kg/mm²): | 158.3 |
| Poisson’s Ratio: | 0.26 |
| Parallelism (arcmin): | <1 |
| Substrate: | Calcium Fluoride (CaF2), Vacuum UV Grade |
| Surface Quality: | 40-20 |
| Surface Flatness (P-V): | λ/2 |
| Type: | Protective Window |
| Wavelength Range (nm): | 400 – 1000 |
| Axis Orientation: | Random |
| Young’s Modulus (GPa): | 75.8 |
| Damage Threshold, By Design: | 5 J/cm² @ 532nm, 10ns |
SHAPE OPTICS Calcium Fluoride (CaF2) Window
Applications:
- Laser Systems:
- Excimer Lasers: The high bulk damage threshold and low absorption make CaF2 windows suitable for excimer laser systems.
- General Laser Systems: Ideal for various laser systems requiring high transmission and low absorption.
- Protective Windows:
- Gas Detectors: Suitable for use as protective windows in gas detectors operating in the Vacuum UV (VUV) and MWIR regions.
- Thermal Imaging: Excellent for cryogenically cooled thermal imaging systems where high transmission in the MWIR is required.
- Spectroscopy Systems:
- UV Spectroscopy: Perfect for UV spectroscopy systems due to their high transmission in the UV range.
- Wideband Substrates: Used as substrates for coatings requiring wideband substrate transmission.
Product Description:
- Material Properties:
- High Transmission: Uncoated CaF2 windows provide high transmission from 200 nm to 7000 nm.
- AR Coatings: Various AR coatings are available to enhance performance in specific wavelength regions.
- Design Options:
- Standard Windows: Available in standard flat window designs for general optical applications.
- Wedged Windows: Available in a wedged design to minimize interference effects and improve measurement accuracy.
- Durability Note:
- Soft Material: Calcium fluoride is relatively soft and more susceptible to scratches compared to typical glass windows. Handle with care to maintain optical quality.
Conclusion
SHAPE OPTICS Calcium Fluoride (CaF2) Windows are designed for high-performance optical applications requiring low absorption and high transmission across a wide wavelength range. Available with various AR coatings and in both standard and wedged designs, these windows are suitable for laser systems, protective applications, and spectroscopy systems. Despite their excellent optical properties, calcium fluoride is relatively soft and should be handled with care to prevent scratches.
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