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<p>Two-color lasers with high coherence are essential for precision measurements and low-noise photonic microwave generation. However, conventional two-color lasers often suffer from reduced coherence when the frequency spacing is large. Here, we leverage the Pound-Drever-Hall technique to synchronize two lasers to a common ultra-stable optical reference cavity to break through the thermal noise constraint, achieving a highly coherent two-color laser. By overcoming non-common mode noise, we achieve an exceptional fractional frequency instability of 2.7&#xa0;×&#xa0;10<sup>−17</sup> at 1 second, normalized to the optical frequency. To characterize coherence across large frequency spacings, we use electro-optical frequency division to transfer the stability of a 0.5 THz spaced two-color laser to a 25 GHz microwave signal. The resulting 25 GHz signals exhibit remarkable phase noise of &#xa0;−&#xa0;74 dBc Hz<sup>−1</sup> at 1 Hz and &#xa0;−&#xa0;120 dBc Hz<sup>−1</sup> at 100 Hz. Our results pave the way for a new era in precision measurement and light-matter interaction.</p>

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Highly coherent two-color laser and its application for low-noise microwave generation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月29日

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  • Bibo He,
  • Jiachuan Yang,
  • Fei Meng,
  • Jialiang Yu,
  • Chenbo Zhang,
  • Qi-Fan Yang,
  • Yani Zuo,
  • Yige Lin,
  • Zhangyuan Chen,
  • Zhanjun Fang,
  • Xiaopeng Xie

摘要

Two-color lasers with high coherence are essential for precision measurements and low-noise photonic microwave generation. However, conventional two-color lasers often suffer from reduced coherence when the frequency spacing is large. Here, we leverage the Pound-Drever-Hall technique to synchronize two lasers to a common ultra-stable optical reference cavity to break through the thermal noise constraint, achieving a highly coherent two-color laser. By overcoming non-common mode noise, we achieve an exceptional fractional frequency instability of 2.7 × 10−17 at 1 second, normalized to the optical frequency. To characterize coherence across large frequency spacings, we use electro-optical frequency division to transfer the stability of a 0.5 THz spaced two-color laser to a 25 GHz microwave signal. The resulting 25 GHz signals exhibit remarkable phase noise of  − 74 dBc Hz−1 at 1 Hz and  − 120 dBc Hz−1 at 100 Hz. Our results pave the way for a new era in precision measurement and light-matter interaction.