论文标题
10 GHz的中红外频率梳子
Mid-infrared frequency combs at 10 GHz
论文作者
论文摘要
我们通过脉冲匹配的非线性培养基中的脉冲内差异频率（DFG）以10 GHz的重复率以10 GHz的重复率证明了中红外（miR）频率梳子。通过光子芯片硅氮化物波导中，通过非线性孤子样压缩机在近红外（NIR）电频率梳子中提供了很少的循环泵脉冲（$ \ MATHBF {\ LISTSIM} $ 15 fs，100 PJ）。随后的脉冲内DFG在定期螺栓液中的Niobate波导中产生的miR频率梳子在3.1---4.1 $ $ m $ m的区域中，而方向图案磷化物的磷化物则在7--11 $μ$ m的覆盖率上提供覆盖率。级联的二阶非线性同时通过在线F-2F非线性干涉法提供了对泵源的载波 - 内螺旋扣频率的访问。此处引入的高重复速率miR频率梳可用于冷凝相光谱和激光杂差辐射测定法。
We demonstrate mid-infrared (MIR) frequency combs at 10 GHz repetition rate via intra-pulse difference-frequency generation (DFG) in quasi-phase-matched nonlinear media. Few-cycle pump pulses ($\mathbf{\lesssim}$15 fs, 100 pJ) from a near-infrared (NIR) electro-optic frequency comb are provided via nonlinear soliton-like compression in photonic-chip silicon-nitride waveguides. Subsequent intra-pulse DFG in periodically-poled lithium niobate waveguides yields MIR frequency combs in the 3.1--4.1 $μ$m region, while orientation-patterned gallium phosphide provides coverage across 7--11 $μ$m. Cascaded second-order nonlinearities simultaneously provide access to the carrier-envelope-offset frequency of the pump source via in-line f-2f nonlinear interferometry. The high-repetition rate MIR frequency combs introduced here can be used for condensed phase spectroscopy and applications such as laser heterodyne radiometry.
