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Laser
crystal Cr+4:Y3Al5O12 or
Cr+4:YAG - is a material that can be used as an active
media for CW, pulsed or self mode-locked tunable NIR solid-state lasers
with the tunability range of 1340 - 1580 nm as well as a media for Q-switching
in lasers with operating wavelength at 950 - 1100 nm. It is particularly
useful in practical applications because of convenient absorption band
of Cr+4 around 1 mm which gives possibilities to pump it by
regular Nd:YAG lasers. A saturation of absorption in the band at 1060
nm is useful for application in small sized Nd:YAG oscillators with
flash lamp or laser diode pumping instead of based on dye or LiF:F-center
passive Q-switches. With the usage of Cr+4:YAG crystal the
self mode-locking (KML) regime is achievable. It gives an opportunity
to build the laser source with pulse duration shorter than 100 fs at
1450 - 1580 nm.
Finally, its high thermal and radiation stability as well
as excellent optical and mechanical properties will give you an opportunity
to design reliable devices based on the crystal. |
MAIN
PROPERTIES OF Cr+4:YAG:
| Mechanical
Properties |
|
| Mohs hardness |
8.5 |
| Thermal
conductivity, W x °K-1 x cm-1 |
0.12 |
| Termooptical
factor (dn/dt) |
8.0 x 10-6
x °K-1 |
| Spectral
Properties |
|
| Operating
transition |
3A2 - 3T2 |
| Absorption
band, nm |
900 - 1150 |
| Emission
band, nm |
1340 -
1580 |
| Dopant
level, at/cm3 |
1017
- 1018 |
| Damage
threshold at 1064 nm, 10 ns, MW/cm2 |
500 |
| Upper-level
lifetime at 300°K, ms |
3.6 |
| Quantum
yield at 300°K, % |
12 |
| Absorption
cross section at 1064 nm, cm2 |
5.0 x 10-18 |
| Emission
cross section at 1420 nm, cm2 |
4.5 x 10-19 |
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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