FW-LT-008

LiTaO₃ (LT) optical crystals, is a kind of transparent crystal, with multiple effects like piezoelectricity, electro-optics, acousto-optics, non-linear optics. It is an excellent material for acoustic transmission medium and high frequency transducers. LT crystals can be widely used in electro-optical devices, laser frequency multiplier and acousto-optic devices.

Characteristics of optical grade LT crystals:

1. crystal structure: trigonal system
2. space groups:R3C
3. lattice parameter：a = 5.154 A;  c = 13.783 A
4. melting point：1650℃
5. density：7.45 g /cm³
6. Curie temperature：610℃
7. Moh’s hardness：5.5～6
8. coefficient of thermal expansion：a a=1.61×10 -6 / k a c= 4.1×10 -6 / k
9. transmitting waveband：400～5000nm
10. refractive index： n0=2.176 ne=2.180 @633nm
11. orientation：X±0.1°
12. sizes：Φ2-4〞×50-80mm

Applications:

Surface acoustic wave filter, resonator, Q-switch, optical modulator, acousto-optic switch, laser frequency doubling, optical parametric oscillator, optical storage, high temperature and high frequency ultrasonic detector, infrared detector and optical pickup device.

Innovation point: Through the crystal growth machine’s modification in rotating and lifting system, the stability of crystal growth interface and growth rate becomes higher. Also the defects caused by the influence of crystal rotating and rising disturbance on the solid-liquid interface during the crystal growth process are reduced.

We create simulation of crystal growth system and can design crystal shape. The computer controls the changing of crystal shape according to crystal growth status, through the processing of precision sensor signals. The ultra low gradient interface growth temperature field we self-designed makes the quality of optical crystals much better.