Lithium Tantalate Wafers

LiTaO₃

LiTaO₃ has numerous applications including electro-optical modulators, pyroelectric detectors, optical waveguide and SAW substrates and piezoelectric transducers due to unique electro-optical, pyroelectric, piezoelectric and acoustic properties, a wide transparency range, and a high optical damage threshold combined with good chemical and mechanical stability. The combination of excellent electro-optical, acousto-optical and nonlinear optical properties makes an attractive host material for application in integrated optics.

Saw Applications:

The most commonly used orientations are Y or Z-cut and 128Å-cut most suitable for applications in television transmission and reception signal processing.

With the increased interest in high frequency telecommunications signal processing for EGSM, AMPS, 3G, Bluetooth and 802.11b, there has emerged a significant interest in rotated cuts where the velocity of the acoustic wave is high. Accordingly 171Å and 106Å doubly rotated wafers have shown an increased demand.

Properties:

   Chemical formula:                                  LiTaO₃

   Molar mass:                                             235.887 g/mol

   Crystal structure:                                    Rhombohedral 

   Lattice constant:                                     a=5.154Å, c=13.783 Å 

   Melting point:                                          1650 ℃

   Density:                                                    7.45 g /cm³

   Solubility in water:                                  Insoluble in water

   Curie temperature:                                 610℃

   Mohs Hardness:                                      5.5 ~ 6

   Thermal expansion coefficient:            A a= 1.61 x 10^-6 c= 4.1 x 10^-6 K / A / K

   Resistance coefficient:                           1015 W.m

   Dielectric constant:                                es11 / e0: 39 ~43    es33 / e0: 42 ~43

                                   et11 / e0: 51 ~54    et11 / e0: 43 ~46

   Color:                                                        colorless

   Transmission range:                               0.4~5.0 um

   Refractive index:                                     no = 2.176 ne= 2.180 @ 633 nm

   Surface Roughness (Ra):                       <5Å

   Crystal Orientations:                               X, Z, 36°Y, 42°Y, 128°Y 

LiTaO3 X-cut:

LiTaO₃ optical grade, X-cut, 10x10x0.5mm, 2 side polished

LiTaO₃ SAW grade, X-cut, 10x10x0.5mm, 1 side polished

LiTaO₃ SAW grade, X-cut, 3″ dia x 0.5mm wafer, 1 side polished

LiTaO3 Y-cut:

LiTaO₃ optical grade, Y-cut, 10x10x0.5 mm, 2 side polished

LiTaO₃ SAW grade, Y-cut, 10x10x0.5 mm, 1 side polished

LiTaO₃ SAW grade, Y-cut wafer with 128 degree off, 3″ dia x0.5 mm, 1 side polished

LiTaO₃ SAW grade, Y-cut wafer with 36 degree off, 3″ dia x0.4 mm, 1 side polished

LiTaO₃ SAW grade, Y-cut wafer with 36 degree off, 4″ dia x0.35 mm, 1 side polished

 LiTaO3 Z-cut:

LiTaO₃ SAW grade, Z-cut, 10x10x0.5 mm, 1 side polished

LiTaO₃ optical grade, Z-cut, 10x10x0.25 mm, 2 side polished

LiTaO₃ optical grade, Z-cut, 10x10x0.5 mm, 2 side polished

LiTaO₃ optical grade, Z-cut, 10x10x1.0 mm, 2 side polished

LiTaO₃ optical grade, Z-cut wafer, 2″ dia x 0.5 mm, 2 side polished  

LiTaO₃ optical grade, Z-cut wafer, 3″ dia x 0.5 mm, 2 side polished