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On-chip dual-comb source for spectroscopy.

Avik Dutt1,2, Chaitanya Joshi3,4, Xingchen Ji1,2

  • 1School of Electrical and Computer Engineering, Cornell University, Ithaca, NY 14853, USA.

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|March 8, 2018
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This summary is machine-generated.

Researchers developed a chip-scale dual optical frequency comb system, simplifying complex dual-comb spectroscopy. This innovation enables compact, high-speed molecular spectral analysis without moving parts.

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Area of Science:

  • Photonics
  • Spectroscopy
  • Optical Engineering

Background:

  • Dual-comb spectroscopy offers real-time, broadband molecular spectral analysis without mechanical parts.
  • Microresonator-based platforms have enabled chip-scale frequency combs, but on-chip dual combs remain challenging due to precise microcavity matching requirements.

Purpose of the Study:

  • To demonstrate the simultaneous generation of two microresonator combs on a single chip from one laser.
  • To simplify experimental complexity for on-chip dual-comb spectroscopy.
  • To introduce a novel method for investigating comb evolution dynamics.

Main Methods:

  • Simultaneous generation of two microresonator combs on a single chip using a single laser.
  • Deterministic tuning into soliton mode-locked states via integrated microheaters.
  • Utilizing one comb as a reference to probe the formation dynamics of the other.

Main Results:

  • Broadband optical spectra spanning 51 THz were achieved.
  • Low-noise operation of both combs was confirmed with narrow (<10 kHz) microwave beat notes.
  • High signal-to-noise ratio absorption spectroscopy over 170 nm was demonstrated within a 20-μs acquisition time.

Conclusions:

  • The developed on-chip dual-comb source drastically reduces experimental complexity.
  • This technology enables compact, robust spectrometers with nanosecond time-scale capabilities.
  • The technique allows for comb evolution studies without auxiliary lasers or microwave oscillators.