Lithium Iodate (LiIO3)

LiIO3 crystal is one of the oldest commercial NLO crystals. Because it has large NLO coefficient.
LiIO3 is used for frequency-doubling, -tripling and mixing of low and medium power lasers.

CASTECH provides large size of LiIO3 Crystals with high optical homogeneity:
They may be as-cut and polished. And sealed housing with AR-coated windows is also avaiable.

Basic Properties

Point Group 6
Transparency Range 300~5000nm
Nonlinear coefficient d15= -5.5x10-12m/V
Refractive Index negative uniaxial
no=1.8571, ne=1.7165 (λ=1064nm)
Sellmeier Equations:(λ in µm)
Sellmeier Equations

Notes to the user of LiIO3

  • LiIO3 is highly hygroscopic,please keep it in a dry environment,and sealed housing is recommended.
    Castech provide both polishing and sealed housing for LiIO3 Crystal.
  • LiIO3 is not recommended for high power applications,because of the low damage threshold.


  • Transmitting wavefront distortion: less than λ/4@633 nm
  • Dimension tolerance: (W±0.2mm)×(H±0.2mm)×(L+0.5mm/-0.2)
  • Clear aperture: >90% central area
  • Flatness:λ/4@633nm
  • Scratch/Dig code: 20/10 to MIL-PRF-13830B
  • Parallelism: better than 20 arc seconds
  • Angle tolerance: <± 0.5°
  • Quality Warranty Period: one year under proper use.




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