Dual frequency comb (DFC) spectroscopy using electro-optic comb generators stands out for its flexibility, easy implementation, and low cost. Typically, two combs with different line spacing are generated from a common laser using independent electro-optic comb generators. This approach minimizes the impact of laser phase noise; however, the distinct paths followed by the two combs ultimately limit the attainable signal-to-noise ratio and long-term stability of the system. In this work, a common-path DFC is generated using a single modulator driven by an arbitrary waveform generator, thus enabling a remarkable increase of the system stability (up to 0.8 s of integration time) while maintaining high flexibility. The proposed technique is experimentally validated by implementing a dual frequency comb with 3000 lines, covering an optical bandwidth of 4.5 GHz, and demonstrating an optical-to-radiofrequency compression factor of 7500. Our system is able to measure extremely narrowband optical features (in the MHz range) with an accuracy only limited by the master laser stability.

中文翻译：

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使用单个电光调制器的共路径双梳光谱

使用电光梳发生器的双频梳 (DFC) 光谱因其灵活性、易于实施和低成本而脱颖而出。通常，使用独立的电光梳状发生器从公共激光器生成具有不同行距的两个梳状梳。这种方法最大限度地减少了激光相位噪声的影响；然而，两个梳子所遵循的不同路径最终限制了系统可达到的信噪比和长期稳定性。在这项工作中，使用由任意波形发生器驱动的单个调制器生成公共路径 DFC，从而显着提高系统稳定性（高达 0.8 秒的积分时间），同时保持高度灵活性。通过实施具有 3000 条线的双频梳，对所提出的技术进行了实验验证，