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For example
e.g. SHG @1064
SFG @800+267->200
DFG @780-842->10600
OPO @355->460+560+960+1150 etc
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For example
e.g. P-coating
ARC @1064 R<0.25%
ARC @1064 R<0.25% + 532 R<0.5%
BBAR @1064 R<1% + 3÷10 R<5%
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New laser crystals of double halogenides KPb2Cl5 |
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| MPb2X5 ( M=K, Rb X= Cl, Br): RE |
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| Crystals of group MPb2X5 ( M=K, Rb X= Cl, Br): RE is a new promising active media for lasers, operating on different wavelengths in the range from UV to mid-IR, including those for TV amplifiers with diode pumping. Interest to this material, which has high RE segregation coefficients and a set of attractive properties increased considerably to date. |
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| Main properties |
| MPb2X5 ( M=K, Rb X= Cl, Br): RE crystals |
|
| |
KPb2Cl5 |
RbPb2Cl5 |
KPb2Br5 |
RbPb2Br5 |
| Transparency range, µm |
0.3 - 20 |
0.3 - 20 |
0.3 - 30 |
0.3 - 30 |
| Space group |
P22/c |
P22/c |
P22/c |
l4mcm |
| Melting temperature, °C |
434 |
423 |
382 |
382 |
| Density, G/cm3 |
4.629 |
5.041 |
5.619 |
5.83 |
Reflection
Index (632.8 nm) |
2.019 |
2.019 |
2.2 |
2.2 |
| Thermal conductivity, W/m*K |
4 |
4 |
- |
- |
| Mohs hardness |
2.5 |
2.5 |
2.5 |
2.5 |
Lattice
parameters |
a, Å |
8.854(2) |
8.959 |
9.256(2) |
8.41 |
| b, Å |
7.927(2) |
7.973 |
8.365(2) |
8.365(2) |
| c, Å |
12.485(3) |
12.493 |
13.025(3) |
14.5 |
| (deg) |
90.05(3) |
90.12 |
90.00(3) |
90.00(3) |
| V |
876.3(4) |
895.3 |
1008.4(4) |
1025.6 |
| Z |
4 |
4 |
4 |
4 |
| |
Chemical stability |
Chemical stabilit
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Low energy of
phonons in halogenides provides mainly radiative transitions between adjacent
levels with the gap ΔЕ≥ 1500 cm-: as a result emission bands cover the wide spectral region
from UV (transitions from upper excited levels) to 9-10 µm in the mid-IR
(transitions within both excited and ground RE multiplets);
Complex of long decay times for lower states, high values of absorption cross-sections and
low rates of the nonradiative multiphonon relaxation makes these crystals
promising for their application as active media for UV/VIS lasers with
up-conversion pumping;
It is important that intense absorption bands match the laser diodes emission for many
RE ions in MPb2X5 crystals.
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|
| Rare - earth ion |
Pr |
Nd |
Dy
[19] |
Er |
Yb
[19] |
Ym |
Ho |
Maximum peak
Absorption cross section,
sr (l max),
10-20 cm2 |
10.9 |
14.9 |
51.8 |
21.5 |
1.78 |
2.85 |
11.0 |
Wavelength (l max),
nm |
487 |
589 |
129.7 |
379.4 |
982 |
797.9 |
453 |
Peak absorption cross section for LD pumping
sr (l max),
10-20 cm2 |
- |
6.22 |
0.9 |
4.8 |
1.78 |
- |
- |
Wavelength (l max),
nm |
- |
808.2 |
810.4 |
982.6 |
982 |
800 |
900 |
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Using the MPb2X5( M=K, Rb X= Cl, Br) : RE one can create lasers with diode laser pumping,
where different mechanisms of energy transformation, including those with
simultaneous and cascade generation, with minimum Stoke's losses, are realized;
Relatively broad, structureless luminescence bands in MPb2X5 ( M=K, Rb X= Cl, Br): RE
crystals allow fine tuning of the stimulated emission frequency;
To date stimulated emission has been obtained for 1.064 µm (Nd), 1.3 and 2.4 µm (Dy) and 4.6 µm (Er)
We suggest the MPb2X5 ( M=K, Rb X= Cl, Br) : RE crystals for joint investigation of the stimulated emission using different schemes;
Variation of RE type and dopant concentration are possible for Variation of RE type and dopant concentration are possible for MPb2X5 (M=K, Rb; X=Cl, Br):RE crystals
Typical sizes of optical elements are 4x4x5 (15) mm3;
Protective/antireflection coatings may be performed on the aperture surfaces of the produced elements .
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| Application |
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- Active media for lasers, laser amplifiers.
- Possibility of different transitions.
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We are able to provide suitable Anti-reflection / Protective, etc. coatings tailored to customer's specifications, reflectivity curves are applied upon request. |
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