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Nd : YAG is the earliest and most famous laser
host crystal. For it combines great advantages in many basic properties,
Nd : YAG is still the ubiquitous presence for near-infrared solid-state
lasers and their frequency-doubler, tripler, and higher order multiplier.
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Basic Properties
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Chemical
Formula :
Crystal structure :
Lattice
constant :
Melting point :
Density
:
Reflective Index :
Thermal Expansion
Coefficient :
Thermal Conductivity(W/m/K)
:
Mohs hardness :
Stimulated
Emission Cross Section :
Relaxation
Time of Terminal Lasing Level :
Radiative
Lifetime :
Spontaneous Fluorescence
:
Linewidth :
Loss Coefficient
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Y3Al5O12
Cubic
12.01¡Ê
1970¡É
4.5g/cm3
1.82
7.8
x 10-6/K<111>
14W/m/K, 20¡É
10.5W/m/K,
100¡É
8.5
2.8 x 10-19cm-2
30
ns
550 §Á
230 §Á
0.6 nm
0.003
cm-1@1064nm
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B
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Basic Properties
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%Nd Concentration
Range(±0.1%) :
Wavefront Distortion
:
(per inch of rod length)
End
Face Parallelism :
Extinction Ratio
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0.6%
- 1.3%
Standard Grade = ¥ë/4
Opto-Lase
Grade = ¥ë/16
<10 arc seconds
25
dB Minimum
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Available
Rod Lengths
. 3 mm - 250 mm
Available
Rod Diameters
. 2 mm - 20 mm
Maximum
Available Slab Size
. 7 mm x
26 mm x 210 mm
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Er:YAG
(2940nm)
Erbium doped Yttrium
Aluminum Garnet
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Applications
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Surgery,
Dentistry, Therapeutic
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Specifications
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%Er Concentration
:
Wavefront Distortion
:
(per inch of rod length)
End
Face Parallelism :
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50%
¥ë/2
<30
arc seconds
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Material
Properties
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Formula
:
Crystal Orientation
:
Density :
Stimulated
Emission
Cross Section
:
Fluorescence Lifetime1
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Er3+:Y3AI5O12
Cubic[111]
5.51
g/cm3
3
x 10-20
cm2
90
§Á
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End Configuration
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Flatness
:
Parallelism :
Perpendicularity
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Surface Quality :
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within
¥ë//10 wave at 633nm wavelength
<30 arc seconds
within
5 minutes of arc
scratch-dig-5
per MIL-O13830A
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Available
Rod Lengths
. 3 mm
- 152.4 mm
Available
Rod Diameters
. 2
mm - 9.525 mm
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Nd:YVO4
(1064nm)
Neodymium Doped
Yttrium Vanadate
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Applications
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Marking,
Spectroscopy, Research
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Specifications
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%Nd Concentration
Range(±0.2%) :
Wavefront
Distortion :
(per inch
of rod length)
End Face
Parallelism :
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0.30%
to 3.0%
¥ë/4
<30
arc seconds
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Available
Rod Lengths
. 3 mm
- 20 mm
Available
Rod Diameters
. 2
mm - 5 mm
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Material
Properties
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Formula
:
Crystal Structure :
Moh
Hardness :
Thermal Conductivity
:
Density :
Specific
Heat :
Thermal Expansion(x
10-6¡É-1) :
Lattice
Constant(nm) :
Index
of Refraction at 1064nm
:
Fluorescence Lifetime(§Á)
:
Cross Section(cm2)
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Nd:YVO4
Tetragonal
4-5
1825¡É
5.2W
cm-1
K-1
4.22
g/cm3
0.59
Jg-1
K-1
4.43
(along a axis)
11.4 (along
c axis)
0.712 (a axis)
0.629
(c axis)
1.97
98
20
x 10-19
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