Photonic comb-rooted synthesis of ultra-stable terahertz frequencies

Dong-Chel Shin, Byung Soo Kim, Heesuk Jang, Young-Jin Kim () and Seung-Woo Kim ()
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Dong-Chel Shin: Korea Advanced Institute of Science and Technology (KAIST)
Byung Soo Kim: Korea Advanced Institute of Science and Technology (KAIST)
Heesuk Jang: Korea Advanced Institute of Science and Technology (KAIST)
Young-Jin Kim: Korea Advanced Institute of Science and Technology (KAIST)
Seung-Woo Kim: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Stable terahertz sources are required to advance high-precision terahertz applications such as molecular spectroscopy, terahertz radars, and wireless communications. Here, we demonstrate a photonic scheme of terahertz synthesis devised to bring the well-established feat of optical frequency comb stabilization down to the terahertz region. The source comb is stabilized to an ultra-low expansion optical cavity offering a frequency instability of 10−15 at 1-s integration. By photomixing a pair of comb lines extracted coherently from the source comb, terahertz frequencies of 0.10–1.10 THz are generated with an extremely low level of phase noise of –70 dBc/Hz at 1-Hz offset. The frequency instability measured for 0.66 THz is 4.4 × 10−15 at 1-s integration, which reduces to 5.1×10−17 at 65-s integration. Such unprecedented performance is expected to drastically improve the signal-to-noise ratio of terahertz radars, the resolving power of terahertz molecular spectroscopy, and the transmission capacity of wireless communications.

Date: 2023
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DOI: 10.1038/s41467-023-36507-y

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