Undoped YAG Crystal (Y3AI5O12)

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Undoped YAG Crystal is an excellent material for UV-IR optical windows, particularly for high temperature and high energy density applications, The mechanical and chemical stability is comparable to sapphire crystal, but YAG is unique with non-birefringence and available with higher optical homogeneity and surface quality. Up to 3'' YAG boule grown by CZ method, as-cut blocks, windows and mirrors are available from Red Optronics.
  • Transmission in 0.25-5.0mm, no absorption in 2-3mm
  • Extremely hard and durable
  • High thermal conductivity
  • High bulk damage threshold
  • High index of refraction and Non-birefringence.
Main Specifications  
Orientation [111] within 5
Diameter +/-0.1mm
Thickness +/-0.2mm
Flatness better than l/8@633nm
Parallelism better than 30''
Perpendicularity better than 5'
Scratch-Dig 10-5 per MIL-O-1383A
Wavefront Distortion better than l/2 per inch@1064nm

Note: other high-precision windows, AR- and HR-coatings are available upon request. 

Physical Properties  
Crystal structure Cubic
Density 4.5g/cm3
Transmission Range 250-5000nm
Melting Point 1970C
Specific Heat 0.59 W.s/g/K
Thermal Conductivity 14 W/m/K
Thermal Shock Resistance 790 W/m
Thermal Expansion 6.9x10-6/K
dn/dt, @633nm 7.3x10-6/K-1
Mohs Hardness 8.5
Refractive Index 1.8245 @0.8mm, 1.8197 @1.0mm, 1.8121 @1.4mm



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