Crystal properties

Crystal Type^.

Crystal Structure

single crystal, synthetic 

Lattice Parameters

a = 12.004 Å 

Orientation

111, 100 

Application

active laser crystals 
(dopants: Nd, Tm, Ho, Er, Cr) 
spectroscopy 
vacuum windows
 

Solubility in Water

none 

Dielectric Constant

11.7 

Elastic Coefficients

C>₁₁> = 3.33 GPa 
C>₁₂> = 1.11 GPa 
C>₄₄> = 1.15 Gpa
 

Young’s Modulus

300 Gpa 

Hardness (Knoop)

1215 (8.5 Mohs) 

Thermal Expansion^.

7.8 ×10>^–6> / K (111)
7.7 ×10>^–6> / K (110)
8.2 ×10>^–6> / K (100)
 

Specific Heat

590 J / (kg K)
 

Thermal Conductivity

14.0 W / (m K)
13.0 W / (m K)
 

Molecular Weight

593.618 

Melting Point

1940 °C / 1970 >^o>C 

Density

4.56 g/cm>³> 

dn / dT^.

9.86 ± 0.04 ×10>^–6> / K
7.3 ×10>^–6> / K
 

Refractive Index

1.8245   @ 0.8   µm
1.81523 @ 1.06 µm
1.8121   @ 1.4   µm
 

Transmission Range

0,25 ... 5 µm 

Chemical Resistance

Inert

Max. of Emission (nm)

550

Decay Constant (ns)

70

Absorbtion Length (cm)

2.61

Relative Efficiency (%)

125

Chemical Composition

Y₃Al₅O₁₂ (Yttrium Aluminium Garnet)

Dopant

Neodymium, Erbium 

Dopant Concentration (atomic%)

0.4 ~ 1.1 

Crystallographic Orientation

(111) ± 5°

Diameters available (mm)

2 ~ 12 

Diameters tolerance (μm)

± 25 

Lengths available (mm)

30 ~ 250 

End Face Flatness

Within λ  / 10 

Parallelism of end faces

10 arc seconds or less 

End face perpendicularity

5 arc minutes or less 

Extinction Ratio

30 dB Min. 

Coating