LiIO3 crystal is one of the oldest commercial NLO crystals. For the high 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 available.

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Basic Properties:

Point Group


Transparency Range


Nonlinear coefficient


Refractive Index

negative uniaxial

no=1.8571, ne=1.7165 (λ=1064nm)

Sellmeier Equations:(λ in μm)



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.

Crystal Specifications:

       •   Transmitting wavefront distortion: less than λ/4 @ 633 nm;
       •   Dimension tolerance: (W ±0.2 mm) x (H ±0.2 mm) x (L + 0.5 /-0.2mm);
       •   Clear aperture: > 90% central area;
       •   Flatness: λ/4 @ 633 nm;
       •   Scratch/Dig code: 20/10 to MIL-PRF-13830B;
       •   Parallelism: better than 20 arc seconds;
       •   Perpendicularity: 5 arc minutes;
       •   Angle tolerance:  < ±0.5°;
       •   Quality Warranty Period: one year under proper use.


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