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FORSTERITE   (Mg2SiO4:Cr4+)

Chromium-activated Forsterite single crystals (Mg2SiO4:Cr4+) turn to be excellent material for tunable lasers both for pulse and CW mode.
 
MATRIX PROPERTIES

Properties

Parameter unit

Values

Crystal dimensions,

Length

Diameter

mm

 

100

25

Syngony

 

Rhombic

Unit sell parameters

ż/span>

a = 4.77

b = 10.28

c = 6.00

Refraction indexes

 

Ng = 1.670

Nm = 1.651

Np = 1.635

Density

g/cm3

3.217

Mohs hardness

 

7

Axial characteristics

 

Biaxial

Melting point

oC

1895

Density of energy

J/cm2

2

Absorption cross section

cm2

1.88 ﳰan> 1018

Thermal expansion coefficient

 

9.5 ﳰan> 10-6

Thermal conductivity

W/cmoK

0.08 (300oK)

Relaxing time of laser oscillation

psec

<10

Stimulated emission cross section

cm2

1.44 ﳰan> 10-19

Spontaneous fluorescence

sec

2.7 ﳰan> 10-6

Optical loss at l= 1230 nm

cm-1

0.005 - 0.06

Absorption coefficient at wavelength of 1064 nm

cm-1

0.7 㮰

Tuning range

nm

1140 ᳴5

Lazing wavelength (center)

nm

1235 (pulse mode)

1244 (CW mode)

Cr4+ concentration

at%

0.05 வ

Room-temperature Fluorescence lifetime

sec ﳰan> 10-6

apr. 1.2.7

Gain cross-section

cm2

apr. 1.45 ﳰan> 10-19

Laser rod diameter

mm

4 ༯:p>

Laser rod length

mm

5 - 80

End face flatness

 

l/10 wave across 80% of aperture

Surface roughness

 

l/10

Perpendicularity

 

within 5 arc minutes

Parallelism

 

15 arc seconds or less

Surface finish

Scratch-dig

10 - 5