基于氮化硅籽晶四波混频的集成CARS源
Integrated CARS Source based on Seeded Four-wave Mixing in Silicon Nitride
摘要：
对基于氮化硅波导的相干反斯托克斯拉曼散射（CARS）集成非线性光源进行了理论研究。利用种子四波混频，获得了波长可调谐、时间同步的信号光和闲频光脉冲。我们发现，所计算的输入泵浦功率所需的非线性波长产生是一个以上的数量级低于以前报道的方法基于光纤。波长转换的调谐范围被计算为1418 nm至1518 nm（闲频）和788 nm至857 nm（信号），其对应于从2350 cm $^{-1}$至2810 cm $^{-1}$的振动跃迁的覆盖。在峰值泵浦功率为300 W时，获得了19.1%的最大转换效率。
英文摘要：
We present a theoretical investigation of an integrated nonlinear light source for coherent anti-Stokes Raman scattering (CARS) based on silicon nitride waveguides. Wavelength tunable and temporally synchronized signal and idler pulses are obtained by using seeded four-wave mixing. We find that the calculated input pump power needed for nonlinear wavelength generation is more than one order of magnitude lower than in previously reported approaches based on optical fibers. The tuning range of the wavelength conversion was calculated to be 1418 nm to 1518 nm (idler) and 788 nm to 857 nm (signal), which corresponds to a coverage of vibrational transitions from 2350 cm$^{-1}$ to 2810 cm$^{-1}$. A maximum conversion efficiency of 19.1% at a peak pump power of 300 W was obtained.
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