Nd:YAG
我司的Nd:YAG 晶体产品，又称掺钕钇铝石榴石晶体，是一种综合性能良好的用作固态激光器的激光介质晶体。Nd:YAG晶体中的原子被闪光灯激发，晶体产生以特定波长（1064 nm）传播的放大光。Nd:YAG晶体在生物物理，医学，军事，机械，科研和建筑等领域有着广泛的应用。该产品有高光学质量、良好的机械和热性能的特点。Nd：YAG是通过将Nd离子掺杂到YAG晶体中而获得的成熟的激光晶体之一。Nd：YAG激光晶体的吸收带宽为730-760nm和790-820nm，通常由闪光管或激光二极管泵浦。典型的激光发射峰值为1064nm，波长为946nm，1120nm，1320nm和1440nm激光也可以通过一些测量发射，Q开关和锁定模式适用于获得不同波长的激光（532nm，分别为266nm，213nm等）和脉冲宽度（10-25ns）。Nd:YAG晶体广泛用于各类固态激光器系统——倍频连续波、高能调Q等。通常，高浓度掺杂晶体应用于脉冲激光器中，低浓度掺杂晶体通常用于连续波输出。
特点
- 增益系数高
- 激光阈值低
- 优异的光学，机械和物理性能
- 高斜率效率
- 宽吸收带宽
材料规格
| 钕浓度公差（atm％） | 0.1- 2.5(+/-0.1)atm% |
| 取向 | [001] or [110] or [111] <±0.5° |
| 平行性 | 10〞 |
| 垂直性 | 5ˊ |
| 表面质量 | 10-5(MIL-O-13830A) |
| 波前失真 | λ/4@632 nm |
| 表面平整度 | λ/8@632 nm |
| 通光孔径 | >95 % |
| 倒角 | <0.2×45° |
| 长度公差 | +0.5/-0mm |
| 厚度/直径公差 | ±0.05 mm |
| 最大尺寸 | dia (3~12.7)×(3~150) mm |
| 损坏阈值 | >750 MW/cm2@1064 nm 10 ns 10 Hz |
| 消光比 | >30 dB(取决于实际尺寸) |
| 精密研磨 | 400 grit |
物理和化学特性
| 晶体结构 | 立方 – la3d |
| 晶格常数 | 12.01 Å |
| 密度 | 4.56 g/cm3 |
| 熔点 | 1950 °C |
| 导热系数/（W·m-1·K-1 @ 25°C） | 14 |
| 比热/（J·g-1·K-1） | 0.59 |
| 断裂应力 | 1.3-2.6*103 kg/cm2 |
| 热膨胀率/（10-6·K-1 @ 25°C） | [100] 取向–8.2 |
| [110] 取向–7.7 | |
| [111] 取向–7.8 | |
| 硬度（莫氏） | 8.5 |
| 杨氏模量/ GPa | 317 |
| 剪切模量/ Gpa | 54.66 |
| 消光比 | 25 dB |
| 泊松比 | 0.25 |
光学和光谱性质
| 激光跃迁 | 4F3/2 →> 4I11/2 |
| 光子能量 | 1.86×10-19 J |
| 激光跃迁波长，λl（nm） | 1064 |
| 泵浦跃迁波长，λp（nm） | 808 |
| 泵浦跃迁带宽，Δλp（nm） | <4 |
| 激光跃迁带宽，Δλl（nm） | ~0.6 |
| 泵过渡峰截面，σp（E-20 cm2） | 6.7 |
| 激光跃迁峰截面，σl（E-20 cm2） | 28 |
| 泵过渡饱和强度φp（kW / cm2） | 12 |
| 激光跃迁饱和强度φl（kW / cm2） | 2.6 |
| 激光跃迁饱和通量Γl，sat（J / cm2） | 0.6 |
| 最小泵浦强度Imin（kW / cm2） | ~0 |
| 上部激光管寿命，τ（毫秒） | 0.26 |
| 量子缺陷分数 | 0.24 |
| 分数热产生 | 0.37 |
| 折光率 | 1.8197 @1.064 µm |
| 荧光寿命 | 230 µs |
吸收和发射光谱
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参考文献
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