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Nd:YAG
- 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.
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Advantages Of Nd:YAG：
• High gain;
• Low threshold;
• High efficiency;
• Low loss at 1064nm;
• Good thermal conductivity and thermal shock characteristics;
• Mechanical strength;
• High optical quality;
• Material characteristics that allow for various modes of operation (CW, pulsed, Q-switched, mode locked).
Table 1.Basic Properties
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Chemical Formula |
Y3Al5O12 |
|
Crystal Structure |
Cubic |
|
Lattice Constant |
12.01Å |
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Melting Point |
1970°C |
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Density |
4.5g/cm3 |
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Reflective Index |
1.82 |
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Thermal Expansion Coefficient |
7.8x10-6 /K<111>，0 - 250 ℃ |
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Thermal Conductivity |
14W/m/K, 20°C |
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Mohs hardness |
8.5 |
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Stimulated Emission Cross Section |
2.8x10-19 cm-2 |
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Loss Coefficient |
0.003 cm-1 @ 1064nm |
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Linewidth |
0.6 nm |
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Radiative Lifetime |
550 μs |
Specifications of Nd:YAG crystal from CASTECH：
• Dimention: size up to dia.15x180mm 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′；
• Parallelism：＜10″；
• Wavefront distortion：λ/8;
• Flatness：λ/10;
• Surface quality: 10/ 5 @ MIL-O-13830A;
• Coatings：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 @946 nm, HR @1319 nm and other wavelengths are also available;
• Damage Threshold: >500MW/cm2 .
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Optical Parameter of Nd:YAG crystal |
|||
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Diameter(mm) |
Standard grade |
Excellence grade |
Superexcellence grade |
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φ3-6.35 |
≤0.5 fringes/inch |
≤0.25 fringes/inch |
≤0.1 fringes/inch |
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≥25dB |
≥28dB |
≥30dB |
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|
φ7-10 |
≤0.7 fringes/inch |
≤0.4 fringes/inch |
≤0.16 fringes/inch |
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≥22dB |
≥25dB |
≥28dB |
|
|
φ11-13 |
≤1 fringes/inch |
≤0.6 fringes/inch |
≤0.2 fringes/inch |
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≥20dB |
≥23dB |
≥26dB |
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φ14-16 |
≤1.2 fringes/inch |
≤0.8 fringes/inch |
≤0.25 fringes/inch |
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≥18dB |
≥20dB |
≥23dB |
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High grade or specific Nd:YAG rods or slabs, and Nd:YAG rods for 946nm and 1319nm lasers can be provided. Er:YAG, Yb:YAG and other ion doped YAG crystals are also available upon request.
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Laser Crystals_Neodymium Doped Yttrium Aluminum Garnet(Nd_YAG) Crystal.pdf
