Neodymium Doped Yttrium Aluminum Garnet (Nd:YAG ) Crystal
Basic Properties:
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Chemical Formula:
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Y3Al5O12
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Crystal structure:
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Cubic
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Lattice constant:
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12.01Å
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Melting point:
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1970 oC
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Density:
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4.5g/cm3
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Reflective Index:
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1.82
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Thermal Expansion Coefficient:
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7.8x10-6 /K <111>
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Thermal Conductivity (W/m/K):
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14W/m/K, 20º C
10.5W/m/K, 100º C
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Mohs hardness:
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8.5
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Stimulated Emission Cross Section:
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2.8x10-19 cm-2
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Relaxation Time of Terminal Lasing Level:
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30 ns
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Radiative Lifetime:
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550 m s
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Spontaneous Fluorescence:
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230 m s
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Line
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0.6 nm
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Pump Wavelength
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807.5nm
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Polarized Emission
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Unpolarized
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Thermal Birefringence
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High
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Absorption band at pump wavelength
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1nm
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Loss Coefficient:
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0.003 cm-1 @ 1064nm
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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 Caston :
· 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：
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Diameter (mm)
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Standard grade
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Excellence grade
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Superexcellence grade
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φ3-6.35
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≤0.5 fringes/ inch
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≤0.25 fringes/ inch
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≤0.1 fringes/ inch
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≥25dB
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≥28dB
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≥30dB
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φ7-10
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≤0.7 fringes/ inch
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≤0.4 fringes/ inch
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≤0.16 fringes/ inch
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≥22dB
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≥25dB
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≥28dB
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φ11-13
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≤1 fringes/ inch
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≤0.6 fringes/ inch
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≤0.2 fringes/ inch
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≥20dB
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≥23dB
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≥26dB
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φ14-16
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≤1.2 fringes/inch
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≤0.8 fringes/inch
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≤0.25 fringes/inch
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≥18dB
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≥20dB
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≥23dB
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