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Lithium fluoride(LiF) window

Lithium fluoride(LiF) window

Lithium fluoride(LiF) optical window


 Single crystal of Lithium fluoride(LiF)
 Polycrystalline of Lithium fluoride(LiF)
 Purity: >99.99%

Other Names

Lithium fluoride window, LiF window, LiF wafer, LiF plate

Applicable wave band

0.12μm ~ 7.0μm

Refractive Index
(at 0.5 μm)


Melting Point

Thermal Conductivity


Kirschner Hardness

99.1 (100)

Elasticity Coefficient


Thermal expansion coefficient


Maximum size

 Diameter 50.8mm (Single crystal)
 Diameter 200mm (Polycrystalline)

Material Standard Size Surface quality
Lithium fluoride(LiF) window

(Single crystal window) or
(Polycrystalline window)
φ10.0mm x 1.0mm
φ25mm x 1.0mm
φ25.4mm x 5.0mm
10 x 10 x 1.0mm
15 x 15 x 2.0mm
Polishing:             Double side optical polished or Epi-polished
Roughness:          Ra 5~10nm, Ra<1.5nm, 
Size Tolerance:          +/-0.1mm
Thickness Tolerance: +/-0.1mm or +/-0.05mm
Parallelism:           1 minute, 30 seconds, 5 seconds or higher
Surface Finish:      60-40, 40-20, 20-10 (scratch-dig)
Surface Figure:      1/2λ, 1/4λ or higher
Chamfer:                0.25mm × 45°
Coating:                 Upon requirements

Lithium fluoride (LiF) crystal have good optical transmission properties and can be used as Ultraviolet and Infrared optical window in the spectral range of 0.11 μm~7.5 μm. Especially in deep Ultraviolet(VUV). With the development of deep Ultraviolet technology in recent years, Becaise of Lithium fluoride (LiF) window have high transmittance and short cut-off wavelength in the deep ultraviolet band, It have received more and more attention.
At the same time, Lithium fluoride (LiF) crystal has excellent scintillation properties and has become an important crystal material in the fields of high-energy physics and nuclear physics, nuclear medicine and other fields.

We can customize different size and thickness of Lithium fluoride(LiF) optical window upon requirements, such as Lithium fluoride(LiF) round wafer, Square substrate and Cylinder, or Punch holes and other shapes.

Contact Us

  • Tel: (+86) 1506 0796 451
  • Fax: (+86) 0597 2212602
  • Email:
  • Work Time ( GMT +8 ):
  •    9 AM ~ 6 PM, Monday to Friday
  • Main office: A7, No. 501, Denggaoxi Road, Xipi street, Xinluo District, Longyan, Fujian, China