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Nd:YAG(Neodimium Doped Yttrium Aluminum Garnet)
 Invented in the sixties of the last century, Nd:YAG(Neodimium Doped Yttrium Aluminum Garnet) has been and continue to be the most widely used laser crystal for solid-state crystal material. 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, and so forth. Compared with others laser crystals, its fluorescence lifetime is twice more than Nd:YVO4, and thermal conductivity is also better.
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
- Nd:YAG can be Q-switched with Cr4+YAG directly
- Due to the cubic symmetry and high quality, Nd:YAG is easy to operate with TEM00 mode
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Main Specifications |
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Nd dopant concentration
Dopant tolerance |
0.6---1.3 atm%
within 10% of concentration. |
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Diameter |
3 ~ 15mm |
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Length |
1~ 160mm |
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Anti-reflection Coating
High transmission Coating
High reflection Coating |
R<0.1 @ 1064nm
T>95% @ 808nm
R>99.8% @ 1064nm |
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Orientation |
<111> crystalline direction (+/-5¡æ) |
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Wavefront Distortion |
<¦Ë/10 per inch at 632.8nm for 3 ~7mm
>¦Ë/10 per inch at 632.8nm for >=7mm |
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Surface quality |
better than 20/10 Scratch/Dig per MIL-O-1380A |
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Parallelism |
< 10 arc seconds |
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Perpendicularity |
< 5 arc minutes |
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Surface flatness |
<¦Ë/10 at 632.8nm |
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Clear aperture |
Central 95% |
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Chamfer |
0.15x45¡ã |
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Damage threshold |
over 15J/cm2 (rods without coating )
over 700 MW/cm2 (coating) |
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Physical and Chemical Properties |
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Chemical Formula |
Nd:Y3A15O12 |
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Crystal Structure |
Cubic Garnet |
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Lattice Constants |
12.01?/font> |
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Concentration |
~ 1.2 x 1020 cm-3 |
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Melting Point |
1970¡æ (2240K) |
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Density |
4.56 g/cm3 |
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Mohs Hardness |
8.5 |
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Refractive Index |
1.82 |
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Thermal Expansion Coefficient |
7.8 x 10-6 /K [111], 0 ¨C 250¡æ |
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Thermal Conductivity |
14 W/m /K @20 ¡æ 10.5 W /m /K @100 ¡æ |
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Physical and Optical properties |
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Lasing Wavelength |
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 |
30 ns |
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Radiative Lifetime |
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 |
807.5 nm |
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Absorption band at pump wavelength |
1 nm |
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Linewidth |
0.6 nm |
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Polarized Emission |
Unpolarized |
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Thermal Birefringence |
High |
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