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| Home » Laser Crystals » Cth:Yag Laser Crystal » Request Quote | Search Roditi |
CTH:YAG -yttrium
aluminium garnet laser crystals
doped with chromium, thulium and
holmium ions to provide lasing
at 2.13 microns are finding more
and more applications, especially
in the medical industry. The inherent
advantage of the crystal is that
it employs YAG as the host. YAG's
physical, thermal and optical
properties are well known and
understood by every laser designer.
Lasers operating
at 2.13 microns couple well into
water and body fluids, and can
take advantage of using silica
fibers for easy, accurate beam
delivery. CTH:YAG can be readily
Q-switched with either electro-optic
material such as LiNbO3
or acousto-optics. Lasers using
CTH:YAG are successfully used
for medical procedures such as
fragmentation of gallstones and
for vascular welding.
Proprietary crystal preparation
technology has been developed to overcome poor lasing
efficiency, one of the major impediments
to the use of laser materials
in the 2 microns wavelength range.
This technology allows production of CTH:YAG
laser crystals with high optical
quality, low scattering losses,
and high efficiency. CTH:YAG laser
crystals optimise the usefulness
of the sensitiser ions for the
holmium basing conditions at room
temperature.
CTH:YAG laser crystals
are offerred in sizes from 3 mm to 10 mm diameter,
with lengths up to 150 mm long.
Call upon our depth of experience
in research, crystal growth and
laser rod fabrication. Roditi
will work with you to produce
CTH:YAG laser crystals that meet
the exact specifications for superior
performance of your 2.13 microns
laser system.
Designed for 2.13 µm output wavelength CTH:YAG is an excellent choice for Medical Laser Applications
| Laser Action | 4
Level Laser |
Upper Laser Level | 5I7 |
| Emission Lifetime | 7.8
msec |
Lower Level | 5I8 |
| Absorption Bands | Flashlamp
Pumped |
Refractive Index | 1.8
at 632 nm |
| Output Wavelength | 2.13 µm at 20°C flashlamp
pump |
Chemical Formula | Y3Al5O12:Cr,Tm,Ho |
| Emission Cross-Section | Σ = 0.98 x 10-20
cm2 |
| Feature | Standard |
Special Order |
| Crystal Orientation | <111> within 5° |
Available |
| Diameter | 3
mm to 10mm |
Available |
| Daimeter Tolerance | +0.0
mm/- 0.05 mm |
Available |
| Length (plano/plano) | 30
mm to 150 mm |
Available
|
| Length Tolerance | ± 0.75 mm |
± 0.50 mm |
| Perpendiculairity of End Faces (plano/plano) | 5
arc-minutes |
2
arc-minutes |
| Parallelism of End Faces (plano/plano) | 10
arc-seconds |
|
| Flatness | 0.1
wave maximum |
0.10
wave maximum |
| (plano/plano) | over
90% of aperture |
over
full aperture |
| Surface Finish at 5X | 20-10
(scratch & dig) |
10-5
(scratch & dig) |
| Barrel Finish | 400
grit |
Polished
approx. 80-50 |
| End Face Bevel | 0.075
mm to 0.12 mm at 45° angle |
|
| Chips | No chips allowed on end face of rod; chip having maximum length of 0.3 mm permitted to lie in the area of bevel and barrel surfaces. | |
| End Configurations | plano/plano, plano/wedge, wedge/wedge or Brewster cut. Plano ends can be finished flat, concave or convex | |
| Coatings | Standard coating is AR at 2.13 µm with R<0.25% each face. Other coatings available. | |