YAG

Undoped YAG is a substrate and window crystal that can be used for both UV and IR optic.It is particularly useful for high temperature and high energy applications.The mechanical stability of YAG is similar to Sapphire,but YAG is not birefringent and is available with high optical homogeneity.

Advantages of Undoped YAG Crystals

● Non-birefringent
● High bulk damage threshold
● High index of refraction,facilitating low aberration lens design
● High thermal conductivity
● Stable mechanical and chemical properties
● Low stress and high optical quality  

Crystal Symmetry   Hexagonal

System

Lattice constant

a =4.75 ; c =12.97

Transparence range

250-5000nm

Density

4.5g/cm3

Mohs hardness

8.5

Melting point

1970℃

Thermal conductivity

14W/m/K

Expansion coefficien

6.9X10 -6/K

Refractive Index

1.8197@1064nm

Typical finished part specifications and tolerances are listed below.

 Material............................................... .............................................YAG

Diameter Tolerance............................................................. ...............+0,-0.025mm

Length Tolerance.................................................................... .......... +/-0.5mm

Parallelism........................................................................................ <10 arc seconds

Perpendicularity............................................................................... ..<5 arc minutes

Chamfer............................................................................................ 0.13±0.08mm at 45°

Barrel Finish........................................... ...... ........... ...................... 50-80 micro-inch(RMS)

Wavefront Distortion Rod.................................... .................... .... .... <λ/8 per inch @632.8nm

Extinction Ratio.............................................................................. >30dB

Surface Flatness....................................................... ......................<λ/10 @632.8nm

Surface Quality................................................................................. 10/5

Clear Aperture................................................................................... >95%

Anti-Reflection Coating........................................................................R<0.15%@1064nm per surface

High-Reflection Coating...........................................Standard HR coating with R>99.8%@1064nm and R<5%@808nm