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a-bbo High Temperature form BBO ( a-BaB2O4 ) is a negative uniaxial crystal. It has large birefringence over the broad transparent range from 189 nm to 3500 nm. The physical, chemical, thermal and optical properties of a-BBO crystal are similar to those of b-BBO. However, the nonlinear optical properties of a-BBO crystal is vanished due to the centric symmetry with its crystal structure. It is not recommended to use for NLO processes.

a -BBO is an excellent crystal to replace Calcite, TiO2 , and LiNbO3 , etc. in Glan-Taylor and Glan-Thompson polarizers as well as walk-off beam splitters, especially for high power and UV polarizer, due to its unique UV transparency, good mechanical properties and high damage threshold.

Specification
Surface Quality: 20/10 Scratch and Dig
Beam Deviation: <3 arc min
Optical Axis Orientation: +/-0.5
Flatness: l/4 @632.8 nm
Transmission Wavefront Distortion: < l /2 @632.8 nm
AR-coating: R<0.5%

 

Calcite is a negative uniaxial crystal that has high birefringence, wide spectral transmission and availability in reasonably sized rhombs. Although is a fairly soft crystal and is easily scratched, it is ideal material used as visible and near IR polarizers, such as Glan Taylor, Glan Thompson and Glan laser.

Carefully selct the raw calcite crystals by inspecting them with a cw green laser beam. We have perfected a number of proprietary processes for cutting, grinding and polishing good quality optical surfaces for calcite prism. These skills are evident in the high quality of the finished components, and enable polarizers to be used with very high peak power lasers.

Specification
Surface Quality: 20/10 Scratch and Dig
Beam Deviation: <3 arc min
Optical Axis Orientation: +/-0.5
Flatness: <l /4 @ 632.8 nm
Transmission Wavefront Distortion: < l /2 @632.8 nm
AR-coating: R<0.5%

 

MgF2 Magnesium Fluoride (MgF2 crystals)is used for optical elements where extreme ruggedness and durability is required. Its useful transmission range is 0.12 ¦Ìm - 8.5 ¦Ìm. Irradiation does not lead to color centers. It is a rugged, hard material which is resistant to thermal and mechanical shock and can be worked to the highest standards.

MgF2 crystal is slightly birefringent and usually supplied with the optic axis cut perpendicular to the window faces.

Magnesium Fluoride (MgF2 crystals)has the following exceptional properties that make it a very important optics crystal.

High optical transmittance from the vacuum ultraviolet to the infrared spectrum region(0.12¡«8.5¦Ìm).
Resistant to mechanical and thermal shock, to radiation.
Chemically stable.
Used for Optical prisms, lenses, wedges, windows, other optical components,and etc.
A positive birefringent crystal ,used for optical fiber communication.

YVO4 The yttrium orthvanadate (YVO4) is a positive uniaxial crystal grown with Czochralski method.

It has good temperature stability and physical and mechanical properties, wide transparency and large birefringence, so it is also ideal for optical components such as fiber optical isolators and circulators, beam displaces and other polarizing optics, etc.

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