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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:
Chemical Formula: | 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 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 |
Radiative Lifetime: | 550 us |
Spontaneous Fluorescence: | 230 us |
Linewidth: | 0.6 nm |
Loss Coefficient: | 0.003 cm-1 @ 1064nm |
Nd:YAG crystal :
● 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
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 | |
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