AI 中文总结
本研究展示集成多功能非线性光子系统，在单片TFLN芯片上实现从CW光到少周期脉冲的转换，提升脉冲能量，拓展少周期非线性光学的应用场景。
AI 中文摘要
超快光学与非线性光子学两大领域支撑着从阿秒科学[1,2]、超快电子学[3]到分子光谱学[4,5]、非线性光学[6-8]、量子纳米光子学[9]及精密计量学[10]的各类应用。然而，要在可扩展的光子集成平台上整合这些能力——包括超短脉冲产生、色散控制及强非线性相互作用——需要各元件具备优异性能并协同工作，同时在整个光路中保留足够的光功率。本文展示了一种集成多功能非线性光子系统，可将连续波（CW）光转换为高峰值功率飞秒脉冲，并利用这些脉冲在薄膜铌酸锂（TFLN）上实现脉冲驱动的非线性光学。微波驱动的电光（EO）展宽，随后经集成色散压缩，产生230飞秒的傅里叶变换限脉冲，在30.7 GHz下能量高达3.3 pJ，相较于此前可比重复频率下的集成脉冲合成，脉冲能量提升了数个数量级[11]。在0.3米色散工程设计的TFLN波导中，孤子动力学将脉冲压缩至35飞秒（6.7个光学周期），同时伴随超过330纳米的相干光谱展宽。在完全单片架构中，电光合成、色散压缩及高Q非线性谐振器均集成于单块TFLN芯片上，可在低至400 fJ的脉冲能量下实现谐振增强的脉冲泵浦与相干光谱展宽。通过统一微波控制的脉冲合成与脉冲驱动的非线性相互作用，本研究为片上从连续波激发到少周期非线性光学建立了直接路径，涵盖微波光子学[12]、光频率合成与计量学、中红外及太赫兹波产生[13,14]等领域。
英文摘要
The twin fields of ultrafast optics and nonlinear photonics enable applications ranging from attosecond science [1, 2] and ultrafast electronics [3] to molecular spectroscopy [4, 5], nonlinear optics [6-8], quantum nanophotonics [9] and precision metrology [10]. However, bringing these capabilities-including ultrashort pulse generation, dispersion control, and strong nonlinear interactions-together within a scalable photonic integrated platform requires exceptional performance and cooperation between components while preserving sufficient optical power across the circuit. Here we demonstrate an integrated multi-functional nonlinear photonic system that transforms continuous-wave (CW) light into high-peak-power femtosecond pulses and harnesses them for pulse-driven nonlinear optics on thin-film lithium niobate (TFLN). Microwave-driven electro-optic (EO) broadening followed by integrated dispersive compression generates 230-fs Fourier-transform-limited pulses with energies up to 3.3 pJ at 30.7 GHz, representing orders of magnitude higher pulse energy than previous integrated pulse synthesis at comparable repetition rates [11]. In a 0.3-meter dispersion-engineered TFLN waveguide, soliton dynamics compress the pulses to 35 fs (6.7 optical cycles), accompanied by coherent spectral broadening exceeding 330 nm. In a fully-monolithic architecture, EO synthesis, dispersive compression and a high-Q nonlinear resonator are integrated on a single TFLN chip, enabling resonantly-enhanced pulse pumping and coherent spectral broadening at pulse energies as low as 400 fJ. By unifying microwave-controlled pulse synthesis and pulse-driven nonlinear interactions, our work establishes a direct path from CW excitation to few-cycle nonlinear optics on chip, with opportunities spanning microwave photonics [12], optical frequency synthesis and metrology, and mid-infrared and terahertz generation [13, 14].
Comments20 pages, 10 figures
