Calcium Fluoride (CaF₂) Lenses are precision optical components manufactured from calcium fluoride crystal substrates. With a broad transmission range covering ultraviolet, visible, and mid-infrared wavelengths (approximately 180 nm–8.0 μm), CaF₂ provides excellent optical performance for applications requiring stable and reliable light transmission.
The material features high laser damage resistance, low fluorescence, excellent optical uniformity, and low birefringence characteristics, making it suitable for advanced optical systems, laser applications, and precision imaging equipment.
Key Features
Ultra-Wide Transmission Range
Calcium fluoride lenses provide outstanding transmission performance across ultraviolet, visible, and infrared regions.
The transmission range extends approximately from 0.13 μm to 10 μm, making CaF₂ suitable for:
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Deep ultraviolet optical applications
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Visible wavelength systems
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Mid-infrared applications, especially the 3–5 μm range
Its broad spectral capability allows integration into multi-band optical designs.
Low Refractive Index and Low Dispersion
With a refractive index of approximately 1.35–1.51 and an Abbe number reaching 95, calcium fluoride offers excellent optical correction performance.
Main advantages include:
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Reduced reflection losses on optical surfaces
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Lower chromatic aberration
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Improved imaging quality and optical accuracy
These properties make CaF₂ an ideal material for high-performance imaging systems.
High Laser Damage Threshold
Calcium fluoride has excellent resistance to high-energy laser exposure and can withstand intense laser irradiation.
It is widely applied in optical systems using:
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Excimer lasers
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High-power laser sources
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Laser processing equipment
Excellent Physical and Chemical Stability
Calcium fluoride provides reliable durability and optical stability under demanding operating conditions.
Material advantages include:
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Better moisture resistance compared with many other fluoride crystals
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Higher hardness than barium fluoride
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Excellent optical homogeneity
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No birefringence characteristics
These properties help maintain consistent optical performance over long-term operation.
Specification of Calcium Fluoride (CaF₂) Lens
| Parameter | Specification |
|---|---|
| Material | Calcium Fluoride (CaF₂) |
| Focal Length Tolerance | ±3% |
| Dimension Tolerance | ±1% |
| Thickness Tolerance | ±0.03 mm |
| Surface Accuracy | △/V=0.3 nm |
| Surface Quality | 10/5 |
| Centration | <1 arc min |
| Clear Aperture | >90% |
| Chamfer | <0.1 |
Applications
Calcium Fluoride (CaF₂) Lenses are commonly used in:
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UV optical systems
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Infrared optical equipment
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Laser optical assemblies
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High-power laser systems
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Spectroscopy instruments
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Precision imaging devices
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Scientific and industrial optical applications
Product Advantages
Calcium Fluoride lenses combine wide spectral transmission, low dispersion, high laser resistance, and excellent optical stability. These characteristics make CaF₂ an effective optical material choice for systems requiring accurate imaging performance and reliable operation across ultraviolet to infrared wavelengths.
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