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Neodymium, Erbium, Holmium or Thulium doped Lithium Yttrium Fluorides
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Lithium Tetraborate
Practically all Rare Earths ions may be injected into YLF lattice. Maximal possible concentration is different for different Rare Earths. For example, Y may be 100% replaced with Yb or La, 50% - with Er, for Nd reachable concentration is to 1.5%.

Pattern wavelengths are: Nd:YLF 1.047 µm, 1.053 µm, 1.313 µm, 1.324 µm and 1.370 µm
Er:YLF 0.85 µm and 2.81 µm
Ho:YLF 0.75 µm and 2.06 µm
Tm:YLF 0.435 µm, 1.89 µm and 2.30 µm

Nd:YLF (Nd:LiYF4) offers an alternative to the more common YAG host for near IR operation. The combination of weak thermal lensing (19 times lower than that of YAG), large fluorescence line width and naturally polarized oscillation makes Nd:YLF an excellent material for CW, modelocked operation. 1.053 µm output of Nd:YLF matches gain curves of Nd:Glass and performs well as an oscillator and pre-amplifier for this host. YLF is grown utilizing the modified Czochralsky technique. The as-grown crystals are then processed into laser rods or slabs, coated in house, and inspected per customer specifications. Long crystals for lamp pumping with concentration to 1.1 atom % and short elements for diode pumping with concentration to 1.5 atom % can be grown.
   The Er:YLF, Ho:YLF and Tm:YLF single crystal rods are designed to be applied in solid-state lasers which are widely used for industrial, medical and scientific applications. Pure YLF crystals are transparent within the spectrum band of 0.12 - 7.5 µm, photo-, thermo- and radiation-resistant. The YLF crystals have low values of non-linear refraction index and thermooptical constants.
PROPERTIES of Nd:YLF:
Crystal symmetry tetragonal
Nd dopant concentration, at.% up to 1.6
Density, g/cm3 3.95
Mohs hardness 4 - 5
Lattice constant, Å a = 5.26, c = 10.94
Refractive index, at 1.053 µm no = 1.448; ne = 1.47
Transmission band, µm 0.1 - 7.5
Thermal conductivity, W x cm-1 x K-1 0.06
Thermal expansion (a), 10-6 x deg C-1 13 along a,   8 along c
Thermooptical factor (dn/dT), at 1.06 µm π = 4.3 x 10-6 x K-1, σ = 2.0 x 10-6 x K-1
Non-linear index n2, esu 0.6 x 10-13
Stimulated emission cross-section, cm2 3.0 x 10-19
Generated wavelength, µm π = 1.047, σ = 1.053
Lifetime, µs 540
Optical losses at 1.053 µm, cm-1 < 0.003
Optical quality < 0.3 x 10-5

STANDARD SPECIFICATIONS:
Rod dimensions, mm dia. (3 - 10) ± 0.1, length (25 - 140) ± 0.2
Rod end face flatness N = 0.5 interf. band, ΔN = 0.5 interf. band
Parallelism of rod end faces, arc.sec 15
End faces perpendicularity, arc.min 5
Barrel finish, µm 1.5
Surface quality better than 10/5 Scratch/Dig per MIL-O-1380A
End faces coating AR/AR coating

We supply rods and slabs with different cross-sections, dimensions and coatings. Different dopants compositions with different concentrations are available for specific customer requirements.

I N Q U I R Y    F O R M :

Material:
Quantity of elements:
Application:

For example: SHG@1064; SFG@800+267->200; DFG@780-842->10600; OPO@355->460÷560+960÷1150; etc.
polished sites:

BLOCK    or  BLOCK
 a-b b-c a-c
or d  
Dopant conc.:
% ;      Orientation:
Dimensions/Tolerances:
For example:
10.0 +/- 0.1
Coating:

For example: ARC s1/s2 1064 R<0.25%; ARC s1/s2 1064 R<0.25%+532<0.5%;
BBAR s1/s2 1064 R<1%+3÷10<5% etc.
a = mm;
c = mm
b = mm or
dia. = mm;
This field is for additional information such as application,
comments, add. requirements etc.

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