Lithium niobate and lithium tantalate are among the most widespread materials for nonlinear, integrated photonics. Mixed crystals with arbitrary Nb-Ta ratios provide a new degree of freedom to tune materials properties, such as the birefringence, but also leverage the advantages of the singular compounds, for example, by combining the thermal stability of lithium tantalate with the larger nonlinear or piezoelectric constants of lithium niobate. Periodic poling is the prerequisite for any nonlinear optical application. For mixed crystals this has been challenging so far due to the lack of homogeneous, mono-domain crystals, which severely inhibit domain growth and nucleation. In this work we demonstrate that surface-near ($< 1$~$μ$m depth) periodic poling on x-cut lithium niobate tantalate mixed crystals can be achieved via electric field poling and lithographically structured electrodes. We find that naturally occurring head-to-head or tail-to-tail domain walls in the as-grown crystal inhibit domain inversion at a larger scale. However, periodic poling is possible, if the gap size between the poling electrodes is of the same order of magnitude or smaller than the average size of naturally occurring domains. This work provides the basis for the nonlinear optical application of lithium niobate tantalate mixed crystals.
Low voltage and high-bandwidth thin-film lithium tantalate modulator on a silicon dioxide substrate
Institute of Physics, Swiss Federal Institute of Technology, Lausanne (EPFL)（洛桑联邦理工学院物理研究所）；Institute of Electrical and Micro Engineering (IEM), EPFL（洛桑联邦理工学院电气与微工程研究所）；Institute of Photonics and Quantum Electronics (IPQ), Karlsruhe Institute of Technology (KIT)（卡尔斯鲁厄理工学院光子与量子电子学研究所）
Broadband suspended lithium tantalate Mach-Zehnder modulator achieving a 460 Gbit/s net data rate
Institute of Physics, Swiss Federal Institute of Technology, Lausanne (EPFL)（洛桑联邦理工学院物理研究所）；Institute of Electrical and Micro Engineering (IEM), EPFL（洛桑联邦理工学院电气与微工程学院）；Institute of Photonics and Quantum Electronics (IPQ), Karlsruhe Institute of Technology (KIT)（卡尔斯鲁厄理工学院光子与量子电子研究所）
Sub-kHz linewidth integrated extended-DBR Pockels lasers using lithium tantalate
Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL)（洛桑联邦理工学院物理研究所）；Deeplight SA（Deeplight公司）；State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences（中国科学院上海微系统与信息技术研究所集成电路材料重点实验室）；Institute of Electrical and Micro engineering, Swiss Federal Institute of Technology, Lausanne (EPFL)（洛桑联邦理工学院电气与微电子工程研究所）
Hybrid Integration of Quantum Dot Single Photon Sources with Lithium Tantalate Photonics for On Chip Routing
National University of Defense Technology（国防科技大学）；Zhejiang University（浙江大学）；Harbin Institute of Technology (Shenzhen)（哈尔滨工业大学（深圳））；Sun Yat-sen University（中山大学）
High-Efficiency Acousto-Optic Modulation on Non-Suspended Thin-Film Lithium Tantalate
University of Science and Technology of China（中国科学技术大学）；Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences（中国科学院上海微系统信息技术研究所）；University of Chinese Academy of Sciences（中国科学院大学）
Robust and Active Visible-Light Integrated Photonics on Thin-Film Lithium Tantalate for Underwater Optical Wireless Communications
National Center for International Research on Green Optoelectronics, South China Normal University（华南师范大学绿色光电子国际联合研究中心）；Jiaxing Research Institute, Zhejiang University（浙江大学嘉兴研究院）
Toward scalable and bias-stable optical phased arrays on lithium tantalate
State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-sen University（中山大学电子与信息学院光电材料与技术国家重点实验室）；State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University（清华大学精密仪器系精密测量技术与仪器国家重点实验室）；State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences（中国科学院上海微系统与信息技术研究所集成材料电路国家重点实验室）；Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences（中国科学院大学材料科学与工程中心）；University of Science and Technology of China（中国科学技术大学）
Leveraging Raman response in X-cut thin-film lithium tantalate for ultrabroadband combs and polychromatic visible light
State Key Lab of Photonics and Communications, Department of Electronic Engineering, Shanghai Jiao Tong University（上海交通大学电子工程系光子与通信国家重点实验室）；The Extreme Optoelectromechanics Laboratory (XXL), School of Physics, East China Normal University（华东师范大学物理学院极端光机电集成实验室）
Simultaneous generation of four-wave mixing and stimulated Raman scattering in coupled lithium niobate microdisks mediated by second harmonic generation
