掺铒绝缘体上铌酸锂高效集成激光器

中文摘要 AI 辅助

绝缘体上铌酸锂（LNOI）结合了铌酸锂（LN）优异的光学特性与强光约束、可扩展制造和高密度集成等优势，使其成为集成光子芯片的领先平台。近年来LNOI光子学进展主要集中在无源和电光元件上，包括耦合器、波导、微腔和调制器，而高效片上激光源的发展仍不充分，限制了全集成LN光子系统的实现。由于LN是间接带隙材料，LNOI上的激光通常依赖于稀土离子掺杂的光致发光，然而掺杂LNOI激光器的转换效率一直较低。通过比较LNOI微腔激光器与光纤激光器和波导放大器，我们确定参与受激发射的稀土离子数量有限是导致泵浦利用率低的关键因素。在此，我们展示了一种集成掺铒LNOI激光器，它结合了高质量、高掺铒LN、大直径宽微环谐振器、低损耗波导放大器和双向泵浦。该架构在1562 nm处实现了16.91%的斜率效率，首次在LNOI平台上超过10%。我们的结果为全集成光子系统中高效LNOI激光器提供了一条途径。

英文摘要

Lithium niobate on insulator (LNOI) combines the outstanding optical properties of lithium niobate (LN) with strong optical confinement, scalable fabrication and high-density integration, making it a leading platform for integrated photonic chips. Recent advances in LNOI photonics have mainly centred on passive and electro-optic components, including couplers, waveguides, microcavities and modulators, whereas efficient on-chip laser sources remain insufficiently developed, limiting the realization of fully integrated LN photonic systems. Because LN is an indirect-bandgap material, lasing on LNOI generally relies on photoluminescence from rare-earth-ion doping, yet the conversion efficiency of doped LNOI lasers has remained low. By comparing LNOI microcavity lasers with fibre lasers and waveguide amplifiers, we identify the limited number of rare-earth ions participating in stimulated emission as a key factor responsible for inefficient pump utilization. Here we demonstrate an integrated Er-doped LNOI laser that combines high-quality, highly Er-doped LN, a large-diameter wide-microring resonator, a low-loss waveguide amplifier and bidirectional pumping. This architecture enables a slope efficiency of 16.91% at 1562 nm, exceeding 10% on the LNOI platform for the first time. Our results provide a route towards high-efficiency LNOI lasers for fully integrated photonic systems.

发表机构

• MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics and TEDA Institute of Applied Physics, Nankai University（南开大学物理学院与泰达应用物理研究院弱光非线性光子学教育部重点实验室）

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