Lithium Fluoride (LiF)
Lithium Fluoride (LiF) optical material for deep-UV and broadband optical use, with local refractive-index reference data for engineering review.
Key Properties
Primary engineering references for material screening, packaging review, and RFQ preparation.
About Lithium Fluoride (LiF)
Overview
Lithium Fluoride (LiF) is usually reviewed for deep-UV optical paths, broadband transmission work, and systems where a low refractive index is more useful than high optical power. In practice, LiF selection also depends on handling method, storage environment, and whether the final optic is a protected assembly or an exposed service part.
Key Material Reference
| Parameter | Reference |
|---|---|
| Practical Transmission Guidance | 0.11-7.0 µm |
| Local RII Dataset Range | 0.10-11.0 µm |
| Reference Dataset | Li formula 1, 297 K |
| Refractive Index | 1.3930 at 0.55 µm |
| Density | 2.639 g/cm3 |
| Handling Note | Confirm storage, cleaning, and exposure conditions before production release. |
Selected Refractive Index Reference
The points below are practical references taken from the local RII dataset. Final design work should still use the released wavelength range and temperature condition of the real assembly.
| Wavelength (µm) | Refractive Index |
|---|---|
| 0.150 | 1.4901 |
| 0.200 | 1.4391 |
| 0.300 | 1.4087 |
| 0.550 | 1.3930 |
| 1.000 | 1.3871 |
| 3.000 | 1.3665 |
| 5.000 | 1.3266 |
Typical Applications
- Deep-UV windows and optical paths
- Broadband spectroscopy components
- Specialized crystal optics for laboratory systems
- Optical designs that need a low-index fluoride substrate
Engineering Notes
LiF is usually selected for spectral coverage, not for mechanical ruggedness. Engineers should confirm environment, cleaning method, coating target, and mounting strategy before specifying the final geometry. Use the broader materials index and available manufacturing routes under products if the design may also fit CaF2 or MgF2.
Procurement Checklist
- State whether the optic is for protected deep-UV use, laboratory handling, or field service.
- Include wavelength band, dimensions, quantity, and coating target in the RFQ.
- Call out any storage, cleaning, or humidity restriction that affects packaging and inspection.
- Confirm whether the request is for a finished optic, substrate blank, or feasibility review only.
Request Engineering Review
Send wavelength range, dimensions, coating target, quantity, and environment notes through the contact page for a practical LiF review.