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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Soliton Microcombs Multiplexing Using Intracavity-Stimulated Brillouin Lasers.

Hao Zhang1, Teng Tan1, Hao-Jing Chen2,3

  • 1Key Laboratory of Optical Fibre Sensing and Communications (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu 611731, China.

Physical Review Letters
|April 28, 2023
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Summary

Researchers demonstrate spatial multiplexing of soliton microcombs using Kerr and Brillouin nonlinearities. This compact, low-cost method enables highly coherent dual-comb sources with tunable repetition rates for advanced applications.

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Area of Science:

  • Nonlinear optics
  • Photonics
  • Microcavity physics

Background:

  • Solitons in microresonators are crucial for nonlinear optical physics and photonic applications.
  • Existing methods for generating multiple frequency combs can be complex and costly.

Purpose of the Study:

  • To demonstrate spatial multiplexing of soliton microcombs.
  • To create a compact, low-cost, and energy-efficient dual-comb source.
  • To explore the co-generation of multiple frequency combs.

Main Methods:

  • Combining Kerr and Brillouin nonlinearities in an over-modal microcavity.
  • Utilizing a single external laser pumping operation.
  • Selecting dual-comb modes to adjust repetition rate differences.

Main Results:

  • Successfully demonstrated spatial multiplexing of soliton microcombs.
  • Achieved highly coherent dual-comb sources with low beating noise.
  • Enabled flexible switching of repetition rate differences from 8.5 to 212 MHz.
  • Co-generated up to 5 space-multiplexing frequency combs in distinct mode families.

Conclusions:

  • The developed scheme offers a novel physics paradigm for comb interferometry.
  • Provides a versatile tool for applications in comb metrology, spectroscopy, and ranging.
  • Represents a significant advancement in compact and efficient frequency comb generation.