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Neodymium Doped Yttrium Aluminum Garnet (Nd:YAG ) Crystal
Basic Properties:
| Chemical Formula: |
Y3Al5O12 |
| Crystal structure: |
Cubic |
| Lattice constant: |
12.01Å |
| Melting point: |
1970 oC |
| Density: |
4.5g/cm3 |
| Reflective Index: |
1.82 |
| Thermal Expansion Coefficient: |
7.8x10-6 /K <111> |
| Thermal Conductivity (W/m/K): |
14W/m/K, 20º C
10.5W/m/K, 100º C |
| Mohs hardness: |
8.5 |
| Stimulated Emission Cross Section: |
2.8x10-19 cm-2 |
| Relaxation Time of Terminal Lasing Level: |
30 ns |
| Radiative Lifetime: |
550 m s |
| Spontaneous Fluorescence: |
230 m s |
| Line |
0.6 nm |
| Pump Wavelength |
807.5nm |
| Polarized Emission |
Unpolarized |
| Thermal Birefringence |
High |
| Absorption band at pump wavelength |
1nm |
| Loss Coefficient: |
0.003 cm-1 @ 1064nm |
Applications:
l Nd:YAG can produce blue laser with the frequency-doubling of 946nm
l Nd:YAG can be operated in a very high power laser up to kw level at 1064nm
l Nd:YAG can be Q-switched with Cr4+YAG directly
l Nd:YAG can be used for high power green laser for SHG@1064nm
Specifications of Nd:YAG crystal from Kaston :
· Nd Dopant Level: 0.5~1.2(±0.1)atm%
· orientation: <111>±30arc minute
· Diameter tolerance: ±0.05mm
· Length tolerance: ±0.5mm
· Perpendicularity: < 5 arc minutes
· Parallelism: <10 arc seconds
· Wavefront distortion: λ/8
· Flatness: λ/10
· Sccratch/Dig: 10/5 @MIL-O-13830A
· Chamfer: 0.1mmx45°
· AR-Coating (Single layer MgF2): R<0.25% per surface (@1064nm)
· Damage Threshold: >500MW/cm^2
Optical Parameter of Nd:YAG crystal：
| Diameter (mm) |
Standard grade |
Excellence grade |
Superexcellence 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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