Neodymium Doped Yttrium Aluminum Garnet (Nd:YAG )
Nd:YAG is the earliest and most famous laser host crystal. Since it combines great advantages in many basic properties, Nd:YAG is the ubiquitous presence for near-infrared solid-state lasers and their frequency-doubling, tripling, and higher order multiplier.
Properties of Nd:YAG:
Chemical Formula |
Y3Al5O12 |
Crystal structure |
Cubic |
Lattice constant |
12.01Ä |
Melting point |
1970°C |
Density |
4.5g/cm3 |
Reflective Index |
1.82 |
Thermal Expansion Coefficient |
7.8x10-6 /K <111> |
Thermal Conductivity (W/m·K) |
14@20°C; 10.5@100°C |
Mohs hardness |
8.5 |
Stimulated Emission Cross Section |
2.8x10-19 cm-2 |
Relaxation Time of Terminal Lasing Level |
30 ns |
Radiation Lifetime |
550 us |
Spontaneous Fluorescence |
230 us |
Line width |
0.6 nm |
Loss Coefficient |
0.003 cm-1 @ 1064nm |
Specifications of Nd:YAG crystal
- Dimension: size up to dia.15x160mm and maximum diameter of dia.40mmx2mm
- Nd-doped Level: 0.3~2.0(±0.1)atm%
- Diameter tolerance: ±0.05mm
- Length tolerance: ±0.5mm
- Perpendicularity: < 5 arc minutes
- Parallelism: <10 arc seconds
- Wave-front distortion: λ/8
- Flatness: λ/10
- Scratch/Dig: 10/5 @MIL-PRF-13830B
- Chamfer: 0.1mmx45°
- HR-Coating: all wavelengths are available.
- Damage Threshold: >500MW/cm2
Optical Parameter of Nd:YAG crystal |
Diameter (mm) |
Standard grade |
Excellence grade |
Super-excellence grade |
φ3-6.35 |
≤0.5 fringes/ inch |
≤0.25 fringes/ inch |
≤0.1 fringes/ inch |
≥25dB |
≥28dB |
≥30dB |
φ7-10 |
≤0.7 fringes/ inch |
≤0.4 fringes/ inch |
≤0.16 fringes/ inch |
≥22dB |
≥25dB |
≥28dB |
φ11-13 |
≤1 fringes/ inch |
≤0.6 fringes/ inch |
≤0.2 fringes/ inch |
≥20dB |
≥23dB |
≥26dB |
φ14-16 |
≤1.2 fringes/inch |
≤0.8 fringes/inch |
≤0.25 fringes/inch |
≥18dB |
≥20dB |
≥23dB |
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