Lithium Fluoride (LiF)
Extremely UV-transparent crystal with low refractive index
Deep-UV Optical Crystal
Lithium Fluoride is a specialised optical crystal offering extremely high transmission in the deep-UV and vacuum-UV regions. It is primarily used in spectroscopy and scientific instrumentation operating at very short wavelengths. LiF is mechanically soft and hygroscopic, requiring careful handling and controlled environments.
Is this material right for your application?
Use When:
Avoid When:
Consider Alternatives:
Deep-UV or vacuum-UV transmission is required
Spectroscopy systems operate below standard UV limits
Maximum short-wavelength transmission is critical
Applications are strictly laboratory-based
Handling and environment can be carefully controlled
Moisture exposure cannot be controlled
Mechanical durability is required
Handling conditions are not strictly managed
Cost or ease of handling is a priority
Magnesium Fluoride (MgF₂) – improved durability with UV performance
Calcium Fluoride (CaF₂) – broader usable wavelength range
Fused Silica – easier handling and fabrication
Key Properties
Optical
Outstanding deep-UV and VUV transmission
Very low refractive index
Mechanical
Extremely soft and fragile
Environmental
Highly hygroscopic
Requires strict environmental control
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Frequently asked questions about Barium Fluoride specifications and use-cases
FAQ
Q1. What wavelength range is LiF used for?
LiF transmits from the deep UV (~105 nm) to ~6 µm.
Q2. Is LiF suitable for deep-UV optics?
Yes. LiF offers excellent deep-UV transmission.
Q3. Is LiF hygroscopic?
Slightly. Moisture control is recommended.
Q4. What are common alternatives to LiF?
MgF₂ and CaF₂.
Excellent VUV and deep-UV performance
Soft and brittle material
Best used in low-humidity environments