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Chromium-doped
Yttrium Aluminium Garnet
Crystal (Cr4+:YAG)
Cr4+:YAG
is an excellent
crystal for
passively
Q-switching
diode-pumped or
lamp-pumped Nd:YAG,
Nd:YVO4,
Nd:YLF, Yb:YAG or
other Nd and Yb
doped lasers at
wavelength range
from 800 to 1200
nm). Passive
Q-switches or
saturable
absorbers provide
high power laser
pulses without
electro-optic
Q-switches,
thereby reducing
the package size
and eliminating a
high voltage power
supply.
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It
is easy to be operated and
therefore outstandingly
suited to replace LiF and
Dye which are commonly
used for passive
Q-switching, because of
its superior properties:
large absorption cross
section in the near IR,
high damage threshold
(>500 MW/cm2),
broad absorption band,
good thermal stability and
heat dissipation
(especially at high
repetition rates).
Cr4+:YAG
is more robust than dyes
or color centers and is
the material of choice for
Nd:YAG, Nd:YVO4,
Nd:YLF, Yb:YAG or other Nd
and Yb doped lasers in
wavelength range from 800
to 1200 nm).
A pulse width of 8.3ns and
a Q-switching efficiency
of 56.9% were obtained by
using passive Q-switched
of Nd:YAG laser. Cr4+:YAG
showed that the pulse
width of passively
Q-switched lasers could be
as short as 5ns for diode
pumped Nd:YAG lasers and
repetition as high as
10kHz for diode pumped
Nd:YVO4 lasers.
Furthermore, an efficient
green output at 532 nm,
and UV output at 355 nm
and 266 nm were generated,
after a subsequent
intracavity SHG in KTP or
LBO, THG and 4HG in LBO
and BBO for diode pumped
and passive Q-switched
Nd:YVO4 and
Nd:YAG lasers.
Basic
Properties
| Chemical
Formula |
Cr4+:Y3Al5O12 |
|
Crystal
Structure
|
Cubic
|
| Dopant
Concentration |
0.5-3.0
mol% |
|
Mohs
Hardness
|
8.5
|
| Density |
4.55
g/cm3 |
|
Melting
Point
|
1950°C
|
|
Thermal
Conductivity
|
0.14
W cm-1
K-1
|
|
Thermal
Expansion
|
6.9
x 10-6
°C-1
|
|
Thermal
Shock
Resistance
|
790
Wm-1
|
|
Refractive
Index
|
1.82
@1064 nm
|
|
Damage
Threshold
|
>
500 MW/cm2
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Standard
Specifications
| Standard
Aperture |
Æ3~10
mm, 2x2~12x12 mm2 |
| Initial
Transmission |
5.0%
~ 98.0% |
|
Transmission
Tolerance
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