磷酸钛氧钾（KTiOPO4，简称KTP）有很高的非线性系数(约为KDP的15倍)、高热导率（为BNN晶体的2倍），容许温度匹配和容许角度匹配范围大，抗灰迹、抗光损伤阈值高，不吸潮、不潮解，在900℃以下不分解，机械性能良好、晶体表面易于抛光，失配度小。其对1064nm的倍频效率可达约80%，该晶体可用于制作倍频、混频、电光调制、光学参量振荡和光学波导等元器件。
参数
| 属性 | 数值 |
| 化学式 | KTiOPO4 |
| 晶体结构 | 斜方晶系,空间群Pna21,点群mm2 |
| 晶格参数 | a=6.404Å, b=10.616Å, c=12.814Å, Z=8 |
| 熔点 | 1172°C |
| 莫氏硬度 | 5 |
| 密度 | 3.01 g/cm3 |
| 导热系数 | 13W/m/K |
| 热膨胀系数 | ax=11×10-6/℃, ay=9×10-6/℃, az=0.6×10-6/℃ |
| 损伤阈值: [GW/cm ] | >0.5 @1064 nm,TEM00, 10ns,10HZ(AR-coated) |
| >0.3 @532 nm,TEM00, 10ns,10HZ(AR-coated) | |
| SHG相位匹配范围 | 497 ~ 1800nm (Type II) |
| Non-vanished 非线性磁化系数 | deff(II)≈(d24– d15)sin2φsin2θ- (d15sin2φ+ d24cos2φ)sinθ |
| d31=6.5 pm/V | |
| d24=7.6 pm/V | |
| d32= 5 pm/V | |
| d15=6.1 pm/V | |
| d33=13.7 pm/V | |
| 热光系数 | dnx/dT=1.1*10-5/℃ |
| dny/dT=1.3*10-5/℃ | |
| dnz/dT=1.6*10-5/℃ | |
| Nd:YAG激光器的类型II SHG@1064nm | 温度接收: 24°C·cm |
| 光谱接收: 0.56nm·cm | |
| 角度接收: 14.2mrad·cm (φ); 55.3mrad·cm(θ) | |
| 离散角: 0.55° |
| 透射范围 | 350~4500nm |
| 吸收系数 | <0.1%/cm @ 1064nm；<1%/cm @ 532nm |
| 折射率 | nx=1.7377, ny=1.7453, nz=1.8297 @1064nm |
| nx=1.7780, ny=1.7886, nz=1.8887 @532nm | |
| Sellmeier 方程(λ in μm) | nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ2 |
| ny2=3.0333+0.04154/(λ2-0.04547)-0.01408λ2 | |
| nz2=3.3134+0.05694/(λ2-0.05658)-0.01682λ2 |
案例
特点
应用
参考文献
案例
KTP晶体用于1064nm到532nm倍频
GTR-KTP；规格：3x3x7.2mm；
镀膜：AR/AR@1064/532nm, R<0.2@1064nm，R<0.5@532nm;
损伤阈值：>600MW/cm2，1064nm，10ns，10Hz
KTP晶体案例（二）
规格：15×15×1 mm；
定向: X-cut；
双面抛光 (15*15 mm)
特点
- 耐高温；
- 热导率高；
- 失配度小；
- 抗阻比值大；
- 透光波段宽；
- 温度敏感性低；
- 机械性能良好；
- 非线性光学系数大；
- 化学机械性能稳定；
- 光电系数高，介电常数低；
应用
532nm激光
医学应用：532 nm KTP激光治疗寻常性痤疮的疗效评估
532 nm KTP激光器是通过使用磷酸钾钛氧化物（KTiOPO4）将Nd：YAG激光辐射倍频而产生的。该波长适合于浅表血管和色素性病变的治疗，并且可用于寻常痤疮和酒渣鼻的治疗。对于寻常痤疮，细菌卟啉的光活化，皮脂生成的减少以及对皮脂腺的附带损害是其作用方式的拟议机制。
532nm KTP激光治疗寻常痤疮疗效评价
医学应用：磷酸钛氧钛（KTP）激光在梨状窝血管瘤的切除中的应用
在激光器中，KTP-532激光器具有多个优点，使其非常适合于切除血管瘤。磷酸磷酸钛氧钾（KTP）激光器的波长在可见光范围内（532 nm）。它不需要瞄准光束，可以通过光纤传输。它也优先被血红蛋白吸收，因此对血管损伤有效。KTP-532激光辅助切除是一种微创方法，具有出血量最少的优势。KTP-532激光具有明显的优势，因为它在切口的任一侧都产生了一个凝结区，并且在切割时似乎可以密封伤口边缘。这是一种快速，耐受良好的微创手术。用这种方法可以避免外部切口和疤痕。这是一种简单，安全，有效的手术治疗方法，在将来具有很大的潜力。
磷酸钛氧钛钾（KTP）激光在梨状窝血管瘤的切除中的应用
1μmNd激光器的辐射
调制器和Q开关：KTiOPO4（KTP）是一种相对较新的材料，被广泛用于将Nd激光器的1μm辐射倍频。
它的高非线性光学d系数，高光学损伤阈值，宽接受角和热稳定的相位匹配特性使其可用于此目的，其大的电光r系数和低介电常数使其对于各种电光应用（例如调制器）具有吸引力和Q开关。
磷酸钛酸钾（KTP）：性能，最新进展和新应用
参考文献
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