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YAG Crystal

  • Introduction

Undoped YAG Crystal

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 CryLight.



Orientation: < 111 > +/-5deg

Diameter Tolerance : +0.0 /-0.1mm

Thickness Tolerance: +/-0.2mm

Surface Quality: better than 10/5 scratch/dig

Parallelism: < 30 arcsec

Flatness: < λ/8 @632.8nm

Perpendicularity: < 5 arcmin

Wavefront Distortion: < λ/2 @632.8nm

Coating: Coating upon Request


Crystal Structure Cubic

Density 4.5 g/cm3

Transmission Range 250 - 5000 nm

Melting Point 1970 °C

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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