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Composite Laser Ceramics by Advanced Bonding Technology

机译：先进粘结技术的复合激光陶瓷

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Composites obtained by bonding materials with the same crystal structure and different chemical compositions can create new functions that do not exist in conventional concepts. We have succeeded in bonding polycrystalline YAG and Nd:YAG ceramics without any interstices at the bonding interface, and the bonding state of this composite was at the atomic level, similar to the grain boundary structure in ceramics. The mechanical strength of the bonded composite reached 278 MPa, which was not less than the strength of each host material (269 and 255 MPa). Thermal conductivity of the composite was 12.3 W/mK (theoretical value) which is intermediate between the thermal conductivities of YAG and Nd:YAG (14.1 and 10.2 W/mK, respectively). Light scattering cannot be detected at the bonding interface of the ceramic composite by laser tomography. Since the scattering coefficients of the monolithic material and the composite material formed by bonding up to 15 layers of the same materials were both 0.10%/cm, there was no occurrence of light scattering due to the bonding. In addition, it was not detected that the optical distortion and non-uniformity of the refractive index variation were caused by the bonding. An excitation light source (LD = 808 nm) was collimated to 200 μm and irradiated into a commercial 1% Nd:YAG single crystal, but fracture damage occurred at a low damage threshold of 80 kW/cm2. On the other hand, the same test was conducted on the bonded interface of 1% Nd:YAG-YAG composite ceramics fabricated in this study, but it was not damaged until the excitation density reached 127 kW/cm2. 0.6% Nd:YAG-YAG composite ceramics showed high damage resistance (up to 223 kW/cm2). It was concluded that composites formed by bonding polycrystalline ceramics are ideal in terms of thermo-mechanical and optical properties.
机译：通过键合具有相同晶体结构和不同化学组成的材料而获得的复合材料可以产生常规概念中不存在的新功能。我们已经成功地粘结了多晶YAG和Nd：YAG陶瓷，它们在粘结界面上没有任何空隙，并且这种复合材料的粘结状态处于原子级，类似于陶瓷中的晶界结构。粘合复合材料的机械强度达到278 MPa，不低于每种主体材料的强度（269和255 MPa）。复合材料的热导率为12.3 W / mK（理论值），介于YAG和Nd：YAG的热导率之间（分别为14.1 W和10.2 W / mK）。通过激光断层扫描不能在陶瓷复合材料的粘结界面处检测到光散射。由于最多粘结15层相同材料而形成的整体材料和复合材料的散射系数均为0.10％/ cm，因此不会发生因粘结而引起的光散射。此外，未检测到光学扭曲和折射率变化的不均匀性是由结合引起的。将激发光源（LD = 808 nm）准直至200μm，并照射到商品化的1％Nd：YAG单晶中，但在80 kW / cm 2 的低损伤阈值处发生了断裂损伤。另一方面，对本研究中制备的1％Nd：YAG-YAG复合陶瓷的粘结界面进行了相同的测试，但直到激发密度达到127 kW / cm 2 。 0.6％Nd：YAG-YAG复合陶瓷具有很高的抗损伤性（高达223 kW / cm 2 ）。结论是，就热机械和光学性质而言，通过粘结多晶陶瓷形成的复合材料是理想的。

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