Tellurium Dioxide Acousto-Optical Crystals

Main features of our TeO2 are as follows:

bullet large boule sizes: up to 70 mm in dia. at 30 mm length along < 110> axis which is growth direction or 45 - 50 mm dia. at 70 mm length;
bullet high crystals homogeneity controlled at blanks preparation stage by shadowgraphy (Schlieren) or interference methods;
bullet low optical beam scattering, no bubbles or inclusions are observed in the crystals volume under 10x microscope;
bullet small optical absorption and, accordingly, high optical power capability exceeding 5W of CW Argon ion laser for standard A grade material and approaching 15 - 20 W for selected A grade grown from highest purity charge;
bullet exclusively good mechanical properties of crystals due to special “know-how” elements of crystal growth and annealing process. As a result the crystals are “soft” and have no tendency to cracking in cutting, grinding, polishing procedures as well as during transducers bonding.

AO elements which we supply are manufactured as a rule according to customers specifications and have the following features:

bullet wide sizes range from as small as 5 x 5 x 10 mm to as large as 25 x 25 x 50 mm;
bullet X-ray orientations of crystals according to any customer’s specifications with accuracy up to 1.5 arc. min.;
bullet high quality polishing: up to 10/5 Scratch/Dig per MIL-013830A with l /4 flatness and 20 arc. sec. parallelism (best parameters);
bullet single wavelength or broadband AR coatings are available according to MIL-C-14806A with less than 0.5% reflectivity per surface for broadband and 0.2% for single wavelength coating;
bullet technical consultant service is available. Our specialists can calculate and offer you the most reasonable configuration of AO element depending on your application. Typical elements we produce are applied in modulators (including multichannel), deflectors (including 2D), AOTF.

Physical properties:

Chemical formula TeO2
Crystal class Tetragonal
Point group D4 - 422

Lattice constants

a = 4.796 Å
c = 7.626 Å

Density

 6.00 g/cm3
Molecular weight 159.61
Melting point 733 °C
Mohs hardness 4 (approximately)
Solubility Virtually insoluble in water; Slightly soluble in dilute acids and bases
Color Clear/colorless
Thermal expansion coefficient (20 °C)

|| <110>    19.5 x 10-6/ °C
|| <001>       6.1 x 10-6/ °C

Thermal conductivity

30 ± 3 mW/cm - °C
Mechanical impedance 3.6 x 106 kg/m - sec

Acoustic velocities (km/sec):
Shear wave propagating along <110> 0.617

Longitudinal wave propagating along <001>

 4.26
Figures of merit M1
(10-7 cm2 - sec/g) 		M2
(10-18 sec3/g)
Shear mode 68.6 1200.0
Longitudinal mode 142.0 34.5

Transparency range

 0.33 - 5.0 mm

Measured refractive indices at room temperature:

Wavelength, mm

n0

ne

0.4765

0.4880

0.4965

0.5017

0.5145

0.5321

0.6328

1.0642

1.152

2.3394

2.3297

2.3232

2.3194

2.3107

2.3001

2.2585

2.2005

2.1955

2.5064

2.4951

2.4874

2.4829

2.4727

2.4602

2.4114

2.3431

2.3373

Elastic stiffness constants at room temperature:
(x1011 dynes/cm2)

n0

ne
C11 5.32 5.6
C12 4.86 5.16
C13 2.12 2.72
C33 10.85 10.51
C44 2.44 2.70
C66 5.52 6.68

Photoelastic constants for 632.8 nm at room temperature:

P11 0.0074
P12 0.187
P13 0.340
P31 0.090
P33 0.240
P66 -0.0463
P44 -0.044

 

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delmar@sciner.com
optics@sciner.com
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