Nd:YAG is the earliest and most well-known laser host crystal. Since it combines obvious advantages in basic properties of laser crystal, Nd:YAG has ubiquitous presence in near-infrared solid-state lasers and their frequency-doubler, tripler, and higher order multiplier.
Basic Properties of Nd:YAG Crystal
Crystal Structure
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Cubic
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Lattice Constant
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12.01 Å
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Melting Point
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1970 °C
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Density
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4.5 g·cm-3
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Reflective Index
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1.82
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Thermal Expansion Coefficient
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7.8×10-6 /K <111>
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Thermal Conductivity (W/m/K)
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14 @20°C 10.5 @100°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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2.8×10-19 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 μs
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Spontaneous Fluorescence
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230 μs
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Line width
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0.6 nm
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Loss Coefficient
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0.003 cm-1 @1064nm
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THATSHIGH Specifications for Nd:YAG Crystal
Dimension
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Maximum length 200mm with tolerance ±0.5mm
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Maximum diameter 20mm with tolerance ±0.05mm
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Doping Concentration Nd
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0.3~1.0 (±0.1) atm%
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Chamfer
|
0.1mm @45º
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Wavefront Distortion
|
λ/8 @633nm
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Damage Threshold
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>750MW/cm2
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Flatness
|
λ/10 @633nm
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Parallelism
|
< 10"
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Perpendicularity
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≤5′
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Surface Quality [S/D]
|
10/5
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Coating
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HR
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R>99.8% @1064nm R<5% @808nm
|
AR
|
R<0.15% @1064nm
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Other HR coatings, e.g. HR@1064nm & 532nm, 946nm, 1319nm etc. are also available
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THATSHIGH Quality Standard of Nd:YAG Crystal
Diameter (mm)
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Standard Grad
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Excellence Grade
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Super Excellence 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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≥ 25 dB
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≥ 28 dB
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≥ 30 dB
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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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≥ 22 dB
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≥ 25 dB
|
≥ 28 dB
|
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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≥ 20 dB
|
≥ 23 dB
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≥ 26 dB
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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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≥ 18 dB
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≥ 20 dB
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≥ 23 dB
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Note: Nd:YAG rods for 946 nm or 1319 nm lasers, and higher grade or specific Nd:YAG rods or slabs can be provided. Er:YAG, Yb:YAG and other ion doped YAG crystals are also available upon request.