Product Description
Polished LT wafer, especially for its good mechanical and electrical coupling, temperature coefficient and other comprehensive performance, is widely used in manufacturing of resonators, high-frequency acoustic surface wave filters, transducers and other electronic communication devices, and applied in many fields like mobile phones, intercom, satellite communication, aerospace etc.
Main Advantages:
High Curie temperature
Large Thermal-electric coefficient
Small dielectric constant
Stable chemical and physical properties
Typical applications:
Acoustic surface wave filter
Resonator
Q switch
Optical modulator
Acoustic and optical switch
Laser multiple frequency multiplier
Optical parametric oscillator
Optical memory
High-temperature and high-frequency ultrasonic detector
Infrared detector
Optical pickup devices
Material Properties
| Crystal Structure | Trigonal |
| Lattice constant | a=5.154Å, c=13.783Å |
| Density | 7.45g/cm3 |
| Melting Point | 1650℃ |
| Curie Point | 603±2℃ |
| Mohs Hardness | 5.5-6.0 |
| Dielectric Constant | es11/eo:39~43, es33/eo:42~43；et11/eo:51~54, et33/eo:43~46 |
| Thermal Conductivity | 1015wm |
| Thermal Expansion Coefficient | a1=a2=1.61×10-6/℃, a3=4.1×10-6/℃ |
| Refractive Indices | n0=2.176 ne=2.180 @ 633mn |
| E-O Coefficient | R33=30.4 |
| Electro-mechanical Coupling factor | R15≥0.3 |
| Pyroelectric Coefficient | 2.3×10-7 C/cm2/K |
| Transmission Range | 400nm-5000nm |
Technical Parameter
Crystro offers:
| Size | 4" ，6" boule or wafer ,Acoustic or Optical grade |
| Doping | No Doping or With Fe |
| Boule Length | ≥50mm |
| Wafer Thickness | 0.25，0.35，0.50(mm) |
| Orientation | Y42°/Y36°/X/Y/Z or Upon Request |
| Surface Process | Single/Double Sides Polishing |
| TTV | < 10µm |
| BOW | ± (25 ~40 µm) |
| Warp | ≤35µm |
| Flat Width | 32.0±2.0（mm) or Upon Request |
| Roughness | Ra≤10Å |
| Chamfer | 0.1mm @45° or round edge |
