Laser crystals - Alexandrite

Alexandrite is a wide-spread crystal among other tunable solid-state materials. Alexandrite is widely used in a wide range of medical applications due to such properties as laser wavelength and tunability. We offer alexandrite rods that  are artificially produced and grown in monocrystalline form with high crystal quality, using a modified Czochralski growth method.

Alexandrite crystal specification:

Material Properties

Molecular weight

126,97

Average dislocation density (cm – 2)

103

Syngony

rhombic

Space group

Pnma

Unit Cell Parameters (Å)

a = 5,47
b = 9,39
c = 4,42

Refractive index

Ng = 1,753
Nm = 1,747
Np = 1,744

Hardness (Mohs)

8,5

Density (г/см3)

3,79

Optic axis

biaxial

Melting Point (°C)

1870

Thermal Conductivity (W cm-1 K-1)

0,23

Crystal characteristics

%Cr Concentration

0,03 – 0,5

Transition cross section at 300 K (cm2)

3,0×10–19

Lifetime (sec)

260×10–6

Optical loss (cm – 1)

0,001 – 0,003

Color

Green (daylight)
Red (with artificial lighting)

Optical elements characteristics (TBD)

Diameter Deviation (mm)

± 0,1

Length deviation (mm)

± 0,5

Rod End Face Flatness Parallelism

10″

Surface finish

IV

Flatness

λ/10

Orientation deviation

< 5°

Orientation

[001]

Diameter (mm)

4 – 10

Length (mm)

60 – 120

Rod End Coatings

AR coatings are possible

 

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