Del Mar Photonics - Newsletter

Lithium Fluoride (LiF)

Lithium Fluoride is used for windows, lenses and prisms in the vacuum UV, UV, visible and infrared where transmission in the range 0.15m m to 6m m is desired. The refractive index varies from about 1.4 to 1.3 in this range. These crystals are optically isotropic, middle hard, unsolubale in water. Modest precautions should be taken against moisture and high energy radiation damage. LiF is attacked by atmospheric moisture at 400 C, and softens at 600 C. LiF is sensitive to thermal shock. This is the best VUV transmitter available.


Physical Properties

Crystal type cubic
Lattice constant       a = 4.026Å
Density 2.64g/cm3
Melting point 870 C
Refractive index n = 1.387 @ 1.0 mm
Transmission band 0.15 - 6.0 mm


UV grade LiF optics is used in research on Ultra-High-Frequency Electronics contact us for a custom quote for LiF optics

Application note

Customer inquiry: I would like to order material that is transparent to vacuum UV light, in particular to 104.8nm photons that are generated by an Ar plasma.
My research has led me to Lithium Fluoride as a suitable material. Do you stock LiF or any windows that transmit 104nm photons?

Customer research area:

Ultra-High-Frequency Electronics

* III-V Transistors
* III-V Integrated Circuits
* mm-wave CMOS & BiCMOS ICs
* wideband fiber optics
* mm-wave RF/wireless

Related publicatiosn

Height-Selective Etching for Regrowth of Self-Aligned Contacts Using MBE and Electron Beam Metal Evaporation


Other recently shipped orders for UV grade LiF optics contact us for a custom quote for LiF optics

LiF windows VUV grade sample specifications

Type: square plane-parallel window
Material: VUV grade LiF
Orientation: 100
Dimensions: 20 x 20 mm (+0.0/-0.2 mm)
Thickness: 3 mm (+0.0/-0.2 mm)
Surface quality: 60/40 scr/dig
Flatness: 5 fringes at 532 nm
Parallelism: ≤ 5 arc minutes
Clear aperture: ≥ 85% of dimensions
Coating: none
Part number: LiF_SPW_20_20_3 request a custom quote

Unpolished (as cut) LiF window
Part number: LiF_SPW_20_20_3_unpolished

T>66% at 135 nm; T>77% at 150 nm;
T>85% at 165 nm

request a custom quote


Del Mar Photonics - Visit our online store or contact us for a custom quote for LiF optics


LiF optical windows (custom order)

Material: LiF optical VUV grade
Working wavelength: 532 nm
Type: circular wedge window
Orientation: 100
Diameter: 2 mm (+0.0/-0.2 mm)
Thickness: 5 mm (+/-0.25 mm)
Finish: 2 sides polished 40/20 scr/dig
Flatness: 5 fringes per inch at 532 nm
Wedge angle on one side 3 deg
(+/- 0.5 deg)
Chamfers: technological for protection from
edge cracks
Coating: none
Part number: LiF_WW_D2_5 certificate of conformity

LiF optics
UV Grade Single Crystal LiF window - VUV_LiF_20_20_3
UV Grade Single Crystal LiF2 window Diameter: 12.7x1.0mm
LiF_WW_D15_5 - LiF wedge windows

MgF2 optics
VUV grade MgF2 viewport
MgF2 Pellin Broca prisms

Lithium Fluoride - LiF

 Model   Product Name+   Buy Now 
 W-LF-15-5   LiF window ø 15 mm x 5 mm, VUV grade  Buy Now 
 W-LF-8.7-3   LiF window ø  8.7 mm x 3 mm  Buy Now 
 W-LF-10-3   LiF window ø 10 mm x 3 mm  Buy Now 
 W-LF-10-3.5   LiF window ø 10 mm x 3.5 mm  Buy Now 
 W-LF-16.4-4   LiF window ø 16.4 mm x 4 mm  Buy Now 
 W-LF-16.4-6   LiF window ø 16.4 mm x 6 mm  Buy Now 
 W-LF-25.4-3   LiF window ø 25.4 mm x 3 mm  Buy Now


Visit our online store or contact us for a custom quote for LiF optics