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arXiv 1807.04790physics.app-phphysics.optics
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氮化硅波导宽带四波混频产生可调谐中红外

Tunable mid-infrared generation via wide-band four wave mixing in silicon nitride waveguides

Abijith Kowligy, Daniel Hickstein, Alex Lind, David Carlson, Henry Timmers, Nima Nader, Daniel Maser, Daron Westly, Kartik Srinivasan, Scott Papp, Scott Diddams

摘要:

实验研究了在光子芯片氮化硅波导中利用四波混频(FWM)实现近红外(NIR)飞秒脉冲到中红外(MIR)的宽带(>100 THz)下变频。纳米光子几何结构中的工程色散,以及氮化硅的宽透明度范围,使大失谐FWM相位匹配成为可能,并在单个芯片上产生2.6-3.6 μ m的可调谐MIR,泵浦脉冲能量为100 pJ。此外,我们观察到> 20 dB的宽带参数增益的NIR脉冲时,FWM过程中操作的频率上转换配置。我们的研究结果展示了集成光子电路如何在同一芯片上实现多种非线性光学现象,并导致工程合成的宽带,可调谐,相干光跨近红外和中红外波长带从光纤为基础的泵。

英文摘要:

We experimentally demonstrate wide-band (>100 THz) frequency down-conversion of near-infrared (NIR) femtosecond-scale pulses from an Er:fiber laser to the mid-infrared (MIR) using four-wave-mixing (FWM) in photonic-chip silicon-nitride waveguides. The engineered dispersion in the nanophotonic geometry, along with the wide transparency range of silicon nitride, enables large-detuning FWM phase-matching and results in tunable MIR from 2.6-3.6 um on a single chip with 100-pJ-scale pump-pulse energies. Additionally, we observe > 20 dB broadband parametric gain for the NIR pulses when the FWM process is operated in a frequency up-conversion configuration. Our results demonstrate how integrated photonic circuits could realize multiple nonlinear optical phenomena on the same chip and lead to engineered synthesis of broadband, tunable, and coherent light across the NIR and MIR wavelength bands from fiber-based pumps.

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