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: |
Y3Al5O12 |
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Crystal structure: |
Cubic |
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Lattice constant: |
12.01Å |
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Melting point: |
1970 oC |
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Density: |
4.5g/cm3 |
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Reflective Index: |
1.82 |
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Thermal Expansion Coefficient: |
7.8x10-6 /K <111> |
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Thermal Conductivity (W/m/K): |
14W/m/K, 20º C
10.5W/m/K, 100º C |
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Mohs hardness: |
8.5 |
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Stimulated Emission Cross Section: |
2.8x10-19 cm-2 |
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Relaxation Time of Terminal Lasing Level: |
30 ns |
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Radiative Lifetime: |
550 m s |
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Spontaneous Fluorescence: |
230 m s |
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Line |
0.6 nm |
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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: |
0.003 cm-1 @ 1064nm |
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%): |
0.9%~ 1.1% |
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Orientation: |
<111> crystalline direction |
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Wavefront distortion: |
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: |
< 10 arc seconds |
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Perpendicularity: |
< 5 arc minutes |
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Clear Aperture: |
>90% |
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Flatness: |
<l/10 @ 633 nm |
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chamfer: |
<0.1 mm @ 45deg. |
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Barrel Finish: |
50-80 micro-inch (RMS) , |
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Anti-Reflection Coating: |
R < 0.20% @ 1064 nm per surface. Damage threshold over 1GW/cm2@ 1064nm, 10 ns and 10 HZ. |
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High-Reflection Coating: |
Standard HR coating with R>99.8% @ 1064nm and R<5% @ 808nm |
Note: The other specification and dimension is available too.
