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Nd:YAG (Neodymium doped Yttrium Aluminium Garnet)
Even many
kinds of excellent laser crystal such as Nd:YVO4, Nd:GdVO4
were developed in recent years, Nd:YAG is still a most important and widely used
solid state laser material at present and in the near future at least. It has
been used in the"micro/mini" "DPSS" ( Diode Pumped Solid State) laser systems to
get high quality, continue Red, Green or Blue laser output in which the blue
laser of Nd:YAG (Lamda=946/2=473nm)
has
higher efficiency and more easy to realizes than Nd:YVO4 blue laser. Nd:YAG was
also widely used in the military, scientific, medical and industrial laser
systems such as various laser range finder, opto-electronic confrontation
systems, high performance scientific laser systems, laser therapy, cosmetology
systems, laser marking, laser drilling and other laser material processing
systems. Especially, Nd:YAG is best laser material for the high power, high
energy, Q-switch and mode-locked ultra short pulse laser systems. The very wide
applications of Nd:YAG in various laser system is because its outstanding
performance in physics, optics and mechanics:
1.
Basic Properties (1.0 atm% Nd doped)
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Chemical Formula
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Nd:Y3Al5O12
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Crystal Structure
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Cubic
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Lattice Constants |
12.01 Å
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Nd+3Concentration
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~
1.2 x 1020 cm-3
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Melting Point |
1970 oC
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Density
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4.56 g/cm3
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Mohs Hardness
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8.5
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Refractive Index
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1.82
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Thermal Expansion Coefficient |
7.8 x 10-6 /K [111], 0-250
oC |
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Thermal Conductivity
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14 W/m /K @20 oC, 10.5 W /m /K @100 oC. |
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Lasing Wavelength
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1064 nm
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Stimulated Emission Cross Section |
2.8x10-19 cm-2
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Relaxation Time of Terminal Lasing Level
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30 ns
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Radiative Lifetime
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550
ms
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Spontaneous Fluorescence |
230
ms
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Loss Coefficient |
0.003 cm-1
@ 1064 nm |
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Effective Emission Cross Section |
2.8 x 10-19 cm2
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Pump Wavelength
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807.5 nm
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Absorption band at pump wavelength
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1
nm
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Linewidth
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0.6 nm
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Polarized Emission
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Unpolarized
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Thermal Birefringence
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High
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2. Standard
Products specification
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Dopant Concentration (atomic %): 0.6%~ 1.1% |
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Orientation: <111>
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Wavefront distortion /10 per inch, measured by a double-pass
interferometer @ 633 nm
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Extinction Ratio:
Rods with diameter from 3 mm to 6.35 mm and with length to 100
mm:>30dB
Rods with diameter from 7 mm to 10 mm and with length to 100
mm:>28dB
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Dimension Tolerances
Rods with diameter: +/-0.025 mm (+/-0.001"), Length: +/-0.5 mm (+/-0.02")
Barrel Finish:50 80 micro-inch (RMS) , polished or grooved rod
barrel are also available |
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Ends Finish:
Surface Figure: <l/10
@ 633 nm
Parallelism: < 10 arc seconds
Perpendicularity:< 5 arc minutes
Surface quality: > 10/5 Scratch / Dig per MIL-O-1380A
chamfer:<0.1 mm @ 45o
clear Aperture:extend over the entire faces to the chamfered edges
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Anti-Reflection Coating:
Hard coating with high damage threshold for high power laser
operation. Reflectivity R < 0.25% @ 1064 nm per surface. Damage
threshold over 750 MW/cm2 @ 1064nm, 10 ns and 10 HZ.
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High-Reflection Coating:
Standard HR coating with R>99.8% @ 1064nm and T> 95% @ 808nm
Other HR coatings, such as HR @ 1064/532 nm, HR @ 946nm, HR 1319 nm
and other wavelengths are also available. |
3. Typical
size Of Nd.:YAG laser crystal
Ø 2 mm x 15 mm, flat/flat, AR 1064 nm
3x3x8 mm, flat/flat, AR 1064+808 nm
4x4x10 mm, flat/Brewster angle
Ø 3 mm x 10 mm, flat/flat, AR 1064 nm
Ø 3 mm x 50 mm, flat/flat, AR 1064 nm
Ø 3 mm x 100 mm, flat/flat, AR 1064 nm
Ø 4 mm x 50 mm, flat/flat, AR 1064 nm
Ø 4 mm x 80 mm, flat/flat, AR 1064 nm
Ø 4 mm x 110 mm, flat/flat, AR 1064 nm
Ø 5 mm x 8 mm, flat/flat, AR 1064+808 nm
Ø 5 mm x 15 mm, flat/flat, AR 1064 + 808 nm
Ø 5 mm x 15 mm, flat/1 degre angle wedge, AR 1064 nm
Ø 5 mm x 127 mm convex/ convex
Ø 5 mm x 115 mm, flat/flat, AR 1064 nm
Ø 5 mm x 76.5 mm, flat/flat, AR 1064 nm
Ø 5 mm x 80 mm, flat/flat, AR 1064 nm
Ø 6.35 mm x 101.6 mm, flat/flat, AR 1064 nm
Ø 6.35 mm x 130 mm, flat/flat, AR 1064 nm
Ø 6.35 mm x 152.4 mm, flat/flat, AR 1064 nm
Ø 7 mm x 115 mm, flat/flat, AR 1064 nm
Ø 8 mm x 120 mm, flat/flat, AR 1064 nm
Ø 8 mm x 160 mm, flat/flat, AR 1064 nm
Ø 9 mm x 110 mm, flat/flat,grooved barrel surface ,AR 1064
nm
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