Cr:YAG
我司的Cr4+：YAG晶体，又称掺铬钇铝石榴石晶体，化学式为Cr:Y3Al5O12，是一种综合性比较优良的调Q晶体产品。不仅可以用作Q 开关，还可以用作增益介质，因为它具有优异的物理化学性质。在激光测距仪、LIDAR和LIBS 系统的无源Q开关激光器领域有广泛的应用。Cr:YAG具有化学稳定、耐用、抗紫外线、导热性好、损伤阈值高（>500 MW/cm2）、操作简单等优点，正在超越LiF和有机染料等传统材料。Cr:YAG是用于无源Q开关（激光二极管或灯泵浦）Nd:YAG、Nd:YLF、Nd:YVO4的优秀且广泛使用的电光材料和其他 0.8~1.2µm 的 Nd（或Yb）掺杂激光器，也是一种可用作CW、脉冲或自锁模可调谐 NIR 固态激光器的活性介质，可调谐范围为1340 – 1580nm以及工作波长为950-1100nm的激光器中用于Q开关的介质。1060 nm 波段的吸收饱和可用于具有闪光灯或激光二极管泵浦的小型 Nd:YAG 振荡器，而不是基于染料或LiF:F中心无源Q开关，使Cr4+:YAG晶体可以实现自锁模 (KML) 状态。它提供了在1450-1580nm处构建脉冲持续时间短于100fs的激光源的机会。
特点
- 高导热率
- 高损伤阈值（> 500MW/cm2）
- 优异的理化特性
- 辐射稳定性
物理和化学特性
| 属性 | 数值 |
| 化学式 | Cr4+:Y3Al5O12 |
| 晶体结构 | cubic – la3d |
| 晶格参数Å | 12.01 |
| 取向 | [100] or [110] < ±0.5° |
| 质量密度 | 4.56 g/cm3 |
| 莫氏硬度 | 8.5 |
| 杨氏模量 | 335 GPa |
| 抗拉强度 | 2 GPa |
| 熔点 | 1970°C |
| 导热系数 | 0.1213 |
| 比热/（J·g-1·K-1） | 0.59 |
| 热膨胀/（10-6 /°C @ 25°C） | 7.8 <111> |
| 7.7 <110> | |
| 8.2 <100> | |
| 抗热震参数 | 800 W/m |
| 消光比 | 25dB |
| 泊松比 | 0.25 |
| 折射率@ 1064 nm | 1.83 |
| 电荷补偿离子 | Ca2+, Mg2+ |
光学性质
| 属性 | 数值 |
| 光密度 | 0.1 to 0.8 |
| 荧光寿命 | 3.4μs |
| 浓度 | 0.5 mol % ~ 3 mol % |
| 发射波长 | 1350 nm ~ 1600 nm |
| 吸收系数 | 1.0 cm-1 ～ 7 cm-1 |
| 基态吸收截面 | 4.3×10-18 cm2 |
| 发射态吸收截面 | 8.2×10-19 cm2 |
| 传输 | 10% to 90% |
| 涂层 | AR≤ 0.2% @1064nm |
| 损伤阈值 | > 500 MW / cm2 |
抛光
| 属性 | 数值 |
| 方向公差 | < 0.5° |
| 厚度/直径公差 | ±0.05 mm |
| 表面平整度 | <λ/8@632 nm |
| 波前失真 | <λ/4@632 nm |
| 表面质量 | 5-Oct |
| 平行 | 10〞 |
| 垂直 | 5ˊ |
| 通光孔径 | >90% |
| 倒角 | <0.1×45° |
| HR涂层 | <= 0.2% (@ 1340nm) |
| 最大尺寸 | 2*2-15*15 mm×20mm |
光谱
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参考文献
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