Description
A magnesium fluoride (MgF2) plano-concave lens is an optical component with one flat (plano) surface and one inwardly curved (concave) surface. Renowned for its broad spectral transmission range from deep ultraviolet (UV, ~0.12 µm) to mid-infrared (IR, ~7 µm), MgF2 excels in UV applications such as excimer lasers (e.g., ArF, KrF) and UV spectroscopy.
Optical MgF2 Magnesium Fluoride Plano-Concave Lens
Specifications
| Material: | MgF2 |
|---|---|
| Diameter: | 2 mm |
| Focal Length: | 15 mm |
| Edge Thickness, Te: | 0.12 mm |
| Lens Type: | Plano-Concave |
| Diameter Tolerance: | +0/-0.1mm |
| Thickness Tolerance: | ±0.1mm |
| Surface Quality: | 60-40 Scratch-dig |
| Surface Accuracy: | 1/4 lambda |
| Concentricity: | <3 arcmin |
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Features
- Low Refractive Index: ~1.38 at 500 nm, reducing surface reflections and enabling high light throughput without anti-reflective coatings.
- Minimal Dispersion: Low chromatic aberration ensures precise focusing across UV and visible wavelengths.
- High Laser Damage Threshold: Suitable for high-power UV and IR laser systems.
- Chemical and Thermal Stability: Resists moisture, acids, and temperatures up to ~300°C.
- Hardness: Mohs hardness of ~5–6, offering better scratch resistance than softer fluorides like BaF₂.
Applications
- UV Lithography: Beam shaping and collimation in semiconductor manufacturing.
- Excimer Laser Systems: Optical components for ArF (193 nm) and KrF (248 nm) lasers.
- Spectroscopy: Lenses for UV-Vis spectrometers and fluorescence analysis.
- Space Optics: Used in satellite and telescope systems due to radiation resistance.
- Microscopy: Correcting spherical aberrations in UV microscopy.
Frequently Asked Questions
What is the primary spectral range of MgF2 plano-concave lens?
MgF2 lens transmit from deep ultraviolet (VUV, ~0.12 µm) to mid-infrared (MIR, ~7 µm), with peak performance in UV applications like excimer lasers.
Why is MgF2 preferred over fused silica in UV optics?
MgF2 offers lower refractive index and higher laser damage threshold, minimizing reflection losses and resisting degradation under intense UV laser exposure.
What role do MgF2 plano-concave lens play in excimer laser systems?
They collimate or diverge laser beams while maintaining UV transparency, critical for semiconductor lithography and medical laser systems.
Are anti-reflective coatings necessary for MgF2 lens?
Due to their inherently low refractive index, MgF2 lens often require no coatings for UV applications, though coatings may enhance performance in visible/IR ranges.
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