AI 中文总结
研究在高Q值LTOI微盘中实现拉曼辅助多波段非线性频率转换网络，通过谐振泵浦产生高纯度单模拉曼激光，附近泵浦下产生多斯托克斯分量及反斯托克斯线，可产生多波段信号，为集成多波段光源及研究耦合非线性动力学提供了平台。
AI 中文摘要
片上非线性频率转换是实现宽带相干光源的关键途径，但在单个谐振器内覆盖电信、可见光和紫外波长仍具挑战。绝缘体上钽酸锂（LTOI）是新兴的集成光子学材料平台，具有强拉曼活性等特性。本文实验展示了高Q值LTOI微盘中的拉曼辅助多波段频率转换网络，谐振泵浦产生高纯度单模拉曼激光，在附近泵浦条件下观察到多个斯托克斯分量及反斯托克斯线，可产生近红外和可见光信号并扩展至紫外波段。这些发现确立了拉曼增益和二阶非线性在单个微腔内的协同作用，该器件为集成多波段光源及研究耦合非线性动力学提供了平台。
英文摘要
On-chip nonlinear frequency conversion offers a key route to broadband coherent light sources, but spanning telecom, visible, and ultraviolet wavelengths within a single resonator remains challenging. Lithium tantalate-on-insulator (LTOI), which has recently emerged as a promising material platform for integrated photonics, combines strong Raman activity, a large second-order nonlinearity, broad optical transparency and high resistance to photorefractive damage, thereby attracting increasing attention for on-chip nonlinear frequency conversion. Here, we experimentally demonstrate a Raman-assisted multiband frequency-conversion network in a high-Q LTOI microdisk with a loaded quality factor of 2.48x10^6. The resonant pumping produced high-purity single-mode Raman lasing with a 3.14 mW threshold, 32.44% slope efficiency, and an excellent side-mode suppression ratio (SMSR) of 29.5 dB. Under a nearby pump condition, we also observe multiple Stokes components together with an anti-Stokes line on the short-wavelength side of the pump. The resulting multiple intracavity Stokes fields subsequently acted as frequency seeds for cascaded chi^(2) processes, producing near-infrared and visible signals and extending the emission to 312.6 nm in the ultraviolet. These findings establish the cooperative action of Raman gain and second-order nonlinearity across widely separated spectral bands within a single microcavity. The device therefore offers a route toward integrated multiband light sources and a platform for studying coupled nonlinear dynamics.
Comments11 pages, 5 figures
