Undoped YAG

Undoped Yttrium Aluminium Garnet (Y3Al5O12 or YAG) is a new substrate and optical material that can be used for both UV and IR optics. It is particularly useful for high-temperature and high-energy applications. The mechanical and chemical stability of YAG is similar to that of Sapphire.

Advantages of Undoped YAG:

  • High thermal conductivity, 10 times better than glasses
  • Extremely hard and durable
  • Non-birefringence
  • Stable mechanical and chemical properties
  • High bulk damage threshold
  • High index of refraction, facilitating low aberration lens design

Features:

  • Transmission in 0.25-5.0 mm, no absorption in 2-3 mm

  • High thermal conductivity

  • High index of refraction and Non-birefringence

Basic properties:

Product Name
Undoped YAG
Crystal structure
Cubic
Density
4.5g/cm3
Transmission Range
250-5000nm
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
Technical Parameters:

  • Orientation:[111] within 5°

  • Diameter:+/-0.1mm

  • Thickness:+/-0.2mm

  • Flatness: l/8@633nm

  • Parallelism:≤ 30"

  • Perpendicularity:≤ 5 ′

  • Scratch-Dig:10-5 per MIL-O-1383A

  • Wavefront Distortion:better than l/2 per inch@1064nm