α-LiIO3 (α-Lithium Iodate)

α－Lithium Iodate, which is a non-ferroelectric polarcrystal with large non-linear optical coefficient and high radiation resistivity, is used in laser technique as the medium to generate secondary harmonic and parametric oscillation.

Even it is one of the oldest commercial NLO crystals, it is stille a widely used non linear optical crystal as its large NLO coefficient and phase match wavelength range., LiIO₃ is used for frequency-doubling, -tripling and mixing of low and medium power lasers. especially used for some LD¡¯s SHG and to get UV light . It is also an ideal material for making narrow-pulse, wide-band ultrasonic transducers in industries of aviation, chemical engineering, metallurgy and petroleum, etc.

Range of transmitted wave length: 0.3-5.0μm(transmissivity86%)

•  Optical homogeneity: the change of refractive index 10^-5-10^-6/cm.

•  SHG conversion efficiency for Nd laser light: 34%.

•  Damage threshold for 1.06μm laser light: 50MW/cm².

•  For parametric oscillation, Continuous tunable light can be obtained from 0.9μm to 1.2μm.

•  Dielectric constant ε=6.

•  Mechano-electronic coupling coefficient for thickness mode Kt=0.51.

•  Sensitivity of high frequency probes: 20 times as high as that of the PZT ceramic.

•  Sound impedance Z=18.5x10⁶kg/m².S

•  Piezoelectric stress constant g₃₃=320x10^-3V/m .N

•  Density ( at room temperature) D=4.502 g/cm³.

•  Sellmeier Equations:

Crystal specifications:

• Transmitting wavefront distortion:less than λ/4@633 nm
• Dimension tolerance:(W¡À0.2mm)x(H¡À0.2mm)x(L+0.5mm/-0.2)
• Clear aperture:>90% central area
• Flatness:λ/4@633nm
• Scratch/Dig code: 20/10 to MIL-0-13830A
• Parallelism: better than 20 arc seconds
• Perpendicularity: 5 arc minutes
• Angle tolerance:
• Quality Warranty Period: one year under proper use.

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.
• LiIO₃is not recommended for high power applications,because of the low damage threshold.

Q & W 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.

Typical size:

* 5x5x50mm cut for O-wave propagation along X-Axis both ends AR-coated 1064-1160nm.

* 5x5x7 mm SHG 772 nm AR 772+386 nm