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Cr:Forsterite
(Cr:Mg2SiO4) crystal
is a new tunable laser material that fills the spectral void in the
near-IR region. The tuning range covers the important spectral range
from 1130 to 1348 nm, which provides a minimal dispersion in optical
fibers. The Cr:Forsterite laser eventually explores its niche applications
for semiconductor characterisation, eye-safe ranging, medical, industrial
and scientific research. Both pulsed and continuous-wave (CW) laser
operations have been obtained when pumped with 532, 578, 629 and 1064
nm.
We provide Cr:Forsterite crystals with the dimensions of
up to 120 mm in length and up to 30 mm in diameter. AR-coatings can
be provided to meet your specific requirements. |
PHYSICAL
AND OPTICAL PROPERTIES:
Cr dopant
concentration, at.% |
0.05 ÷
0.50 |
Syngony |
rhombic |
Lattice
space parameters, Å |
a = 4.77;
b = 10.28; c = 6.00 |
Refractive
indexes |
ng
= 1.670; nm = 1.651; np = 1.635 |
Density,
g/cm3 |
3.217
|
Mohs hardness |
7 |
Axial
characteristic |
biaxial |
Thermal
expansion coefficient |
9.5 x
10-6 x °K-1 |
Thermal
conductivity, W x cm-1 x °K-1 |
0.08 |
Stimulated
emission cross section, cm-2 |
1.44 x
10-19 |
Relaxation
time of terminal lasing level, ps |
< 10 |
Radiative
lifetime, µs |
25 |
Spontaneous
fluorescence, µs |
2.7 |
Absorption
loss at 1230 nm, cm-1 |
0.007
- 0.060 |
Absorption
coefficient at 1064 nm, cm-1 |
0.7 -
3.0 |
SPECTROSCOPIC
AND LASER PROPERTIES:
Major
pumping bands, nm |
850 -
1200; 600 - 850; 350 - 550 |
Fluorescence
band, nm |
680 -
1400 |
Fluorescence
lifetime at 25°C, µs |
< 3 |
Lasing
wavelength (center) |
1235 nm
(pulsed), 1244 nm (CW) |
Spectral
bandwidth |
30 nm
(pulsed), 12 nm (CW) |
Typical
slope efficiency |
23% (pulsed),
38% (CW) |
Tuning
range, nm |
1130 -
1348 |
Gain cross
section, cm2 |
< 1.45
x 10-19 |
Rods with
round cross-sections and slabs are manufactured
Diameter,
mm |
(4 ÷
10) ± 0.1 |
Length, mm |
(60 ÷
110) ± 0.6 |
Ends unparallelity |
10´´ |
Surface quality,
scratch/dig |
10 - 5 |
Flatness |
»/10 |
Orientation
tolerance |
< 5° |
Orientation |
001 |
We supply rods and
slabs with different cross-sections, dimensions and coatings. Different
dopants compositions with different concentrations are available for
specific customer requirements.
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