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ALEXANDRITE BeAl2O4:Cr3+
(LASER)

 

Having emerged in the field of laser manufacturing just recently, Alexandrite became the leader among other tunable solid-state materials straight away because of the unique advantages exhibited by alexandrite lasers. Especially wide application of such lasers is found in medicine for 

Photodynamic cancer therapy, blood purification in acquired immunodeficiency syndrome (AIDS) treatment,  coverlet and hypodermic tissues, gall-stones and gravel destruction in gall-bladder and kidney, hair epilation.

“SOLIX” puts on the market Alexandrite crystals and elements both for lasers with diode and lamp pumping.

 

Properties

Parameter unit

Values

Molecular weight

 

126.97

Mean dislocation density

cm2

103

Syngony

 

Rhombic

Spatial group

 

Pnma

Unit sell parameters

Å

a = 5.47

b = 9.39

c = 4.42

Refraction indexes

 

Ng = 1.753

Nm = 1.747

Np = 1.744

Density

g/cm3

3.79

Moh’s hardness

 

8.5

Axial characteristics

 

Biaxial

Melting point

oC

1870

Thermal conductivity

W/cmoK

0.23

Color

 

Green (for daylight),

Red (for artificial lightening)

 
 

BeAl2O4:Cr3+ PROPERTIES

Cr4+ concentration

at%

0.03 – 1.0

Stimulated emission cross-section at 300 K

cm2

3.0 ´ 10-19

Lifetime

sec

260 ´ 10-6

Optical loss (l= 750 nm)

cm-1

0.001 - 0.003

Wavelengths of operation in CW and pulsed mode 

mm

0.70 – 0.82

 
 

BeAl2O4:Cr3+ LASER RODS

Configuration of rod’s cross section

 

Round

Sizes and processing

Diameter tolerance

mm

+/- 0.1

Length tolerance

mm

+/- 0.5

Non-parallelism of end faces

 

10”

Surface finish

Scratch-dig

10-5

Flatness

 

l/10

Orientation tolerance

 

< 0.5o

Rod’s orientation

 

[001]

Diameter

mm

4 – 10

Length

mm

60 - 120