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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-doubler, tripler, and higher order multiplier.
Basic Properties of Nd:YAG:
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Y3Al5O12 |
Crystal structure: |
Cubic |
Lattice constant: |
12.01Å |
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 |
Mohs hardness: |
8.5 |
Stimulated Emission Cross Section: |
2.8x10-19 cm-2 |
Relaxation Time of Terminal Lasing Level: |
30 ns |
Radiative Lifetime: |
550 us |
Spontaneous Fluorescence: |
230 us |
Linewidth: |
0.6 nm |
Loss Coefficient: |
0.003 cm-1 @ 1064nm |
· Dimension: size up to dia.15x160mm and maximum diameter of dia.40mmx2mm
· Nd Dopant Level: 0.3~2.0(±0.1)atm%
· 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-PRF-13830B
·Chamfer: 0.1mmx45°
· HR-Coating: R>99.8%@1064nm and R<5%@808nm
· AR-Coating (Single layer MgF2): R<0.25% per surface (@1064nm)
· Other HR coatings, such as HR @ 1064/532 nm, HR @ 946nm, HR 1319 nm and other wavelengths are also available.
· Damage Threshold: >500MW/cm^2
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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 |
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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 |