An excitation source with two independent-tunable Stokes wavelengths is demonstrated for dual-frequency coherent anti-Stokes Raman scattering applications. Two Stokes wavelengths can be independently tuned over 300 nm, corresponding to a molecular vibrational range of approximately 3600 cm−1, by vectorially adjusting the ultrashort pulse injected into a polarization-maintaining photonic crystal fiber. The Raman resonances of benzonitrile at 2230 cm−1 and 3073 cm−1 are excited and detected simultaneously by tuning two Stokes wavelengths to 948 nm and 1031 nm respectively, which confirms that the proposed excitation source is suitable for simultaneous detection of two Raman resonances.

中文翻译：

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使用 PM-PCF 和矢量调整具有两个独立可调斯托克斯波长的双频 CARS 激励源

具有两个独立可调斯托克斯波长的激发源被证明用于双频相干反斯托克斯拉曼散射应用。通过矢量调整注入保偏光子晶体光纤的超短脉冲，两个斯托克斯波长可以独立调谐超过 300 nm，对应于大约 3600 cm-1 的分子振动范围。通过将两个斯托克斯波长分别调谐到 948 nm 和 1031 nm，可以同时激发和检测苄腈在 2230 cm-1 和 3073 cm-1 处的拉曼共振，这证实了所提出的激发源适用于同时检测两个拉曼共振。