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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.
We have recently 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 f
(3~10)´ (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´ 10-19 cm2 |
|
Corresponding Coefficient |
a
=1.1,1.5,2.3cm-1@1064nm; a =8,10,12cm-1@733nm |
|
Melting Point |
1890° C |
|
Density |
3.22 g/cm3 |
|
Mohs Hardness |
7 |
|
Thermal Expansion Coefficient |
9.5´ 10-6/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 |
〜3μs |
|
Lasing Wavelength (center) |
1235nm (pulsed), 1244nm (CW) |
|
Typical Slope Efficiency |
23% (pulsed), 38% (CW) |
|
Tuning range |
1130-1367nm |
|
Gain Cross Section |
〜2´ 10-19 cm2 |
|
Absorption Section |
〜1.3´ 10-19cm2 |
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