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Introduction
Nd:YAG(Neodimium Doped Yttrium Aluminum
Garnet) has been widely used laser crystal for solid-state
laser. Its laser parameters are a good compromise between
the strengths and weaknesses of its competition. Nd:YAG
crystals are used in all types of solid-state lasers systems-frequency-doubled
continuous wave, high-energy Q-switched , etc.. Compared
with others laser crystals, its fluorescence lifetime is
twice more than Nd:YVO4, and thermal conductivity is also
better. 
 High Gain, Low Threshold, High Efficiency,
Low Loss at 1.06 mm, High Optical Quality,
Good Mechanical and Thermal Properties
Due to the cubic symmetry and high quality, Nd:YAG
is easy to operate with TEM00 mode
Basic Properties:
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Chemical
Formula:
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Y3Al5O12
|
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Crystal
structure:
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Cubic
|
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Lattice
constant:
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12.01Å
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|
Melting
point:
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1970
oC
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Density:
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4.5g/cm3
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Reflective
Index:
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1.82
|
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Thermal
Expansion Coefficient:
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7.8x10-6
/K <111>
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Thermal
Conductivity (W/m/K):
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14W/m/K,
20º C
10.5W/m/K, 100º C
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Mohs
hardness:
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8.5
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Stimulated
Emission Cross Section:
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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
m s
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Spontaneous
Fluorescence:
|
230
m s
|
|
Line
|
0.6
nm
|
|
Pump
Wavelength |
807.5nm
|
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Polarized
Emission |
Unpolarized |
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Thermal
Birefringence |
High
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Absorption band
at pump wavelength |
1nm
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Loss
Coefficient:
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0.003
cm-1 @ 1064nm
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Applications:
Nd:YAG can produce blue laser with the frequency-doubling
of 946nm
Nd:YAG can be operated in a very high power laser
up to kw level at 1064nm
Nd:YAG can be Q-switched with Cr4+YAG directly
Nd:YAG can be used for high power green laser for
SHG@1064nm
Nd:YAG’s Specifications:
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Doping(atm%):
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0.9%~
1.1%
|
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Orientation:
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<111>
crystalline direction
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Wavefront
distortion:
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l/8
per inch @ 633 nm |
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Extinction
Ratio: |
>28dB
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Dimension
Tolerances |
Rods
with diameter: ¡À0.025 mm , Length: ¡À0.5 mm
|
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Surface
quality: |
10/5
Scratch / Digper MIL-O-1380A |
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Parallelism:
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<
10 arc seconds |
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Perpendicularity:
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<
5 arc minutes |
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Clear
Aperture:
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>90%
|
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Flatness:
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<l/10
@ 633 nm
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chamfer:
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<0.1
mm @ 45deg. |
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Barrel
Finish:
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50-80
micro-inch (RMS) , |
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Anti-Reflection
Coating:
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R
< 0.20% @ 1064 nm per surface. Damage threshold
over 1GW/cm2@ 1064nm, 10 ns and 10 HZ.
|
|
High-Reflection
Coating: |
Standard
HR coating with R>99.8% @ 1064nm and R<5%
@ 808nm |
Note: The other specification
and dimension is available too.
Standard Products
| Part No. |
Doping |
Dimension |
Coating |
| YAG0305 |
1% |
f3X50mm |
AR/AR@1064nm
|
| YAG0404 |
1% |
f4X40mm |
AR/AR@1064nm
|
| YAG0606 |
1% |
f6X60mm |
AR/AR@1064nm
|
| YAG0608 |
1% |
f6X80mm |
AR/AR@1064nm
|
| YAG0610 |
1% |
f6X100mm |
AR/AR@1064nm
|
| YAG0612
|
1% |
f6X120mm |
AR/AR@1064nm
|
| YAG0812 |
1% |
f8X120mm |
AR/AR@1064nm
|
| YAG0813 |
1% |
f8X135mm |
AR/AR@1064nm
|
Note: The other specification and dimension is available
too |
Laser Crystals