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Cr:
Forsterite 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 1130nm to 1367nm,
which provides a minimal dispersion in optical fibers.
The Cr: Forsterite laser eventually explores its niche applications
for semiconductor characterization, eye-safe ranging, medical,
industrial and scientific research. Both pulsed, continuous-wave
(CW) and fs laser operation have been obtained when pumped
with 532, 578, 629 and 1064nm. It can be also used as
a passive Q-switch for solid state lasers, such as ruby laser,
Alexandrite, Cr: LiSAF, etc.
Dream
Lasers
has developed the state of the art technology in growing the
Cr: Forsterite crystal with the Czochralski method.
The standard Cr: Forsterite crystal with the dimensions of
¦Õ(3-10)¡Á(10-30)mm are steadily available. Other specifications,
AR-coatings can be provided to meet your specific requirements.
|
Physical,
Thermal and Optical Properties
| Chemical
Formula |
Cr:
Mg2SiO4 |
| Structure |
Orthorhombic,
Pbnm |
| Gain
Cross Section |
~2¡Á10-19
cm2 |
| Corresponding
Coefficient |
¦Á=1.1,
1.5, 2.3cm-1@1064nm;
¦Á=8, 10, 12cm-1@733nm |
| Melting
Point |
1890¡æ |
| Density |
3.22g/cm3 |
| Mohs
Hardness |
7 |
| Thermal
Expansion Coefficient |
9.5¡Á10-6/K |
| Thermal
Conductivity |
Gain
Cross Section |
| Loss
Coefficient |
<0.02
cm-1 |
| Refractive
Index |
1.635 |
| Surface
damage threshold |
9.5J/cm2
@ 6ns; 4.4J/cm2 @ 0.6ns |
Spectroscopic
and Laser Properties
| Major
Pumping Bands |
850-1200,
600-850, 350-550nm |
| Fluorescence
Band |
680-1400nm |
| Room-temperature
Fluorescence Lifetime |
~3¦Ìs |
| Lasing
Wavelength (center) |
1235nm
(pulsed), 1244nm (CW) |
| Typical
Slope Efficiency |
23%
(pulsed), 38% (CW) |
| Tuning
range |
1130-1367nm |
| Gain
Cross Section |
~2¡Á10-19
cm2 |
| Absorption
Section |
~1.3¡Á10-19
cm2 |
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