Del Mar Photonics - Newsletter December 2010 - Newsletter April 2011

Tellurium Dioxide Acousto-Optical Crystals

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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

Del Mar Photonics featured optical components

Del Mar Photonics continuously expands its optical components portfolio. Browse our online store, read monthly notes about our featured optical products or just send us your requirements or product ideas. 


 		 Axicon Lens
Axicon lens also known as conical lens or rotationally symmetric prism is widely used in different scientific research and application. Axicon can be used to convert a parallel laser beam into a ring, to create a non diffractive Bessel beam or to focus a parallel beam into long focus depth.
Del Mar Photonics supplies axicons with cone angles range from 130° to 179.5° for use with virtually any laser radiation. We manufacture and supply axicons made from BK7 glass, fused silica and other materials.
buy online - download brochure
Del Mar Photonics offers optical elements made of high quality synthetically grown Rutile Titanium Dioxide crystals. Rutile (TiO2) coupling prisms
Del Mar Photonics offers optical elements made of high quality synthetically grown Rutile Titanium Dioxide crystals. Rutile’s strong birefringency, wide transmission range and good mechanical properties make it suitable for fabrication of polarizing cubes, prisms and optical isolators. Boules having high optical transmission and homogeneity are grown by proprietary method. Typical boules have 10 - 15 mm in dia. and up to 25 mm length. Optical elements sizes - from 2 x 2 x 1 mm to 12.7 x 12.7 x 12.7 mm. Laser grade polish quality is available for finished elements. So far we the largest elements that we manufactured are 12 x15 x 5 mm, in which optical axis is parallel to 15 mm edge, 5 mm is along beam path, 12 x 15 mm faces polished 20/10 S/D, one wave flatness, parallelism < 3 arc.min. (better specs. available on request).
more details - buy online - download brochure

Vacuum viewport
Del Mar Photonics offer a range of competitively priced UHV viewports , Conflat, ISO or KF including a variety of coatings to enhance performance. Del Mar Photonics viewports are manufactured using advanced techniques for control of special and critical processes, including 100 percent helium leak testing and x-ray measurements for metallization control. Windows Materials include: Fused silica, Quartz , Sapphire , MgF2, BaF2, CaF2, ZnSe, ZnS, Ge, Si, Pyrex. Standard Viewing diameters from .55" to 1.94 ".
Coating - a range of custom coatings can applied - which include
- Single QWOT
- Broad Band AR
- V coatings
- ITO
- DLC (Diamond like coating)
more details - request a quote

Manufacturing challenging optical components
Our group works to characterize the interaction of biomolecules with solid surfaces, writes Dennis Hore of University of Victoria, Canada.  Nature designs proteins with well-defined structures in solution.  The conformation of these molecules may serve a structural purpose, or a chemical one in the case of enzymes.  In order to further the progress of technologies that immobilize such molecules on synthetic surfaces (like biosensors employing enzymes), it is important to have a detailed understanding and control of the interactions of these molecules with the surface more
For that project Del Mar has been able to manufacture all shapes of prisms from CaF2, fused silica, and ZnSe according to our custom specifications.

Del Mar Photonics online store features windows, prisms, lenses, attenuators, etalons, crystals and wafers, and other items. Axicons, barium fluoride windows, germanium etalons, rutile (TiO2) prisms, microchannel plates and detectors, saturable absorber mirrors, photoconductive THz antennas, lithium niobate wafers and crystals and many other high quality affordable components for scientific research and OEM production are delivered globally from stock.
Micro Prism from Del Mar Photonics - Concentrating Photovoltaics
We are looking forward to hear from you and help you with your optical and crystal components requirements. Need time to think about it? Drop us a line and we'll send you beautiful Del Mar Photonics mug (or two) so you can have a tea party with your colleagues and discuss your potential needs 

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