Octave-spanning Kerr soliton frequency combs in dispersion- and dissipation-engineered lithium niobate microresonators

Yunxiang Song; Yaowen Hu; Xinrui Zhu; Kiyoul Yang; Marko Lončar

doi:10.1038/s41377-024-01546-7

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Octave-spanning Kerr soliton frequency combs in dispersion- and dissipation-engineered lithium niobate microresonators

Original Articles

- Octave-spanning Kerr soliton frequency combs in dispersion- and dissipation-engineered lithium niobate microresonators
- Light: Science & Applications Vol. 13, Issue 10, Pages: 2342-2352(2024)
- Affiliations：
  
  1.John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
  2.Quantum Science and Engineering, Harvard University, Cambridge, MA, USA
- Author bio：
  
  Yunxiang Song (ysong1@g.harvard.edu)
  Kiyoul Yang (kiyoul@seas.harvard.edu)
  Marko Lončar (loncar@g.harvard.edu)
- Funds：
- DOI：10.1038/s41377-024-01546-7
  CLC：
- Received：18 March 2024，
  
  Revised：18 July 2024，
  
  Accepted：2024-07-21，
  
  Published Online：02 September 2024，
  
  Published：31 October 2024
- Accepted：
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Song, Y. X. et al. Octave-spanning Kerr soliton frequency combs in dispersion- and dissipation-engineered lithium niobate microresonators. Light: Science & Applications, 13, 2342-2352 (2024).
DOI：

Song, Y. X. et al. Octave-spanning Kerr soliton frequency combs in dispersion- and dissipation-engineered lithium niobate microresonators. Light: Science & Applications, 13, 2342-2352 (2024). DOI： 10.1038/s41377-024-01546-7.

摘要

Abstract

Dissipative Kerr solitons from optical microresonators

commonly referred to as soliton microcombs

have been developed for a broad range of applications

including precision measurement

optical frequency synthesis

and ultra-stable microwave and millimeter wave generation

all on a chip. An important goal for microcombs is self-referencing

which requires octave-spanning bandwidths to detect and stabilize the comb carrier envelope offset frequency. Further

detection and locking of the comb spacings are often achieved using frequency division by electro-optic modulation. The thin-film lithium niobate photonic platform

with its low loss

strong second- and third-order nonlinearities

as well as large Pockels effect

is ideally suited for these tasks. However

octave-spanning soliton microcombs are challenging to demonstrate on this platform

largely complicated by strong Raman effects hindering reliable fabrication of soliton devices. Here

we demonstrate entirely connected and octave-spanning soliton microcombs on thin-film lithium niobate. With appropriate control over microresonator free spectral range and dissipation spectrum

we show that soliton-inhibiting Raman effects are suppressed

and soliton devices are fabricated with near-unity yield. Our work offers an unambiguous method for soliton generation on strongly Raman-active materials. Further

it anticipates monolithically integrated

self-referenced frequency standards in conjunction with established technologies

such as periodically poled waveguides and electro-optic modulators

on thin-film lithium niobate.

关键词

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references

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