RbTiOPO4（RTP）晶体是一种具有优良综合性能的非线性光学晶体材料。RTP是目前最常用的具有高频率重复，高功率和窄脉冲宽度激光器Q开关的实用电光晶体。RTP电光器件具有出色的综合性能，不仅用于激光微加工和激光测距，而且还用于重大的科学勘探项目。
RbTiOPO4（RTP）–具有大的非线性光学系数，大的电光系数，高的光致抗蚀剂损伤阈值和稳定的理化性质的晶体
生长温度范围为950°C至800°C，生长期通常为45至60天，由于RTP的透明范围为0.4至3.5μm，因此可用于多种类型的激光器，例如Er：YAG激光器2.94微米，效率相当高。使用光热公共路径干涉仪，在1.064μm处的体积吸收测量范围为50至150 ppm。
参数
| 高损伤阈值 | 在10 mm长的涂层晶体上以10 Hz时> 15 J / cm2,1064 nm时为10 ns |
| 低工作电压 | 在1064 nm处，对Y形切割施加1300 V电压，对X形切割施加1600 V电压，这对晶体的孔径为4×4mm²，长度为2×10 mm |
| 低体积吸收 | 在1064 nm下<250 ppm / cm |
| 平均折射率 | 1.8 | |||||
| 对于0.5 <λ<3.5μm的Sellmeier方程系数 | Ai | Bi | Ci | Di | Ei | pi |
| 2.1982 | 0.8995 | 0.2152 | 1.5433 | 11.585 | 1.9727 | |
| 2.2804 | 0.8459 | 0.2296 | 1.1009 | 9.66 | 1.9696 | |
| 2.3412 | 1.0609 | 0.2646 | 0.9714 | 8.149 | 2.0585 | |
| 透明范围，μm | 0.35 → 4.5 | |||||
| 1064 nm处的残留吸收（PCI） | <250 ppm/cm | |||||
| 电光常数（@ 633 nm，1 kHz），pm。 V-1 | r13 | 10.9 | ||||
| r23 | 15 | |||||
| r33 | 33 | |||||
| 介电常数 | εeff=13 |
| 化学式 | RbTiOPO4 |
| 晶体结构 | Orthorhombic |
| 点群 | mm2 |
| 晶格参数Å | a 12.96 |
| b 10.56 | |
| c 6.49 | |
| 密度g.cm-3 | 3.6 |
| 电阻率（20°C，20％湿度），欧姆。厘米 | 1012 |
| 孔径，mm2 | 从2×2 到 9×9 |
| 长度，毫米 | up to 10 |
| 尺寸公差 | ±0.1 mm |
| 平整度 | <l/8 @633 nm |
| 表面质量 | Scratch/Dig 10/5 |
| 平行性 | better than 30 arc sec |
| 垂直性 | better than 30 arc min |
| 角度公差 | △q < 0.5°, △f < 0.5° |
| 涂层 | AR coatings |
| 通光孔径 | >90% central area |
| 传输波前失真 | less than l/8 @ 633 nm Dimension |
| 熔点 | ~ 1000 °C |
| 铁电转变温度 | ~810 °C |
| 莫氏硬度 | ~5 |
| 热膨胀系数，/°C | a1=1.01×10-5, a2=1.37×10-5, a3=-4.17×10-6 |
| 吸湿性 | No |
| 离子电导率（室温，10 kHz） | 10-8 S/cm |
特点
- 透明范围广
- 稳定的机械和化学性能
- 高损伤阈值
- 体积小
- 不容易潮解
- 高温稳定性
- 低半波电压
- 适用于高频操作
应用
应用：电光调制器
由于Q开关，尤其是主动Q开关，由于其稳定的脉冲能量和在高重复率下的低时间抖动，因此可以实现高重复率（≥100kHz）。有源Q开关主要包含两种常用的Q开关模式：声光（AO）Q开关和电光（EO）Q开关。AO调Q激光器具有高重复率的特性（通常可以达到200 kHz），但是由于它倾向于产生长脉冲（通常为几十到一百纳秒），因此在许多领域受到限制。与AO Q开关相比，EO Q开关可以克服AO Q开关的缺点，并由于其快速的损耗变化而获得稳定的短脉冲。但是EO Q开关需要非常高的电压驱动器。这导致难以获得高脉冲重复率。近年来，随着新型电光晶体RTP的发展，EO调Q固态激光器的重复率得到了显着提高。
具有双晶RTP电光调制器的高重复频率880 nm二极管直接泵浦电光Q开关Nd：GdVO4激光器
应用：电光Q开关https://www.laser-crylink.com/wp-content/uploads/2019/07/17-High-repetition-rate-880-nm-diode-direct-pumped-electro-optic -Q开关Nd：GdVO4-激光与双晶体RTP电光调制器.pdf
高脉冲重复频率Nd：YAG扭曲模式激光器使用RTP晶体作为电光Q开关。获得了1、5和10 kHz的稳定单纵模激光束，其线宽小于0.1 GHz。在7.5 W的入射泵浦功率和10 kHz的PRF下，单纵模激光器的最大输出功率为1.19W。相应的转换效率，单脉冲能量和脉冲峰值功率为15.8％，119μJ，和2.5千瓦
具有扭曲模式腔的RTP Q开关单纵模Nd：YAG激光器
参考文献
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