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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Modelocking and femtosecond pulse generation in chip-based frequency combs.

Kasturi Saha1, Yoshitomo Okawachi, Bonggu Shim

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.

Optics Express
|February 8, 2013
PubMed
Summary

Researchers explored frequency combs in silicon-nitride microresonators, achieving ultra-short pulses. This work demonstrates soliton modelocking for generating tunable, ultra-fast laser pulses.

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Area of Science:

  • Nonlinear optics
  • Photonics
  • Materials science

Background:

  • Parametric frequency combs are crucial for various spectroscopic applications.
  • Silicon-nitride microresonators offer a promising platform for integrated photonics due to their low loss and high nonlinearity.
  • Achieving stable, ultra-short pulse generation is a key challenge in microresonator-based frequency comb generation.

Purpose of the Study:

  • To investigate the temporal and spectral properties of parametric frequency combs in silicon-nitride microresonators.
  • To demonstrate the generation of ultra-short pulses and understand the underlying physics of pulse formation.
  • To explore the potential of these devices for generating tunable, ultra-fast laser pulses across a wide spectral range.

Main Methods:

  • Simultaneous measurement of temporal, optical, and radio-frequency spectral characteristics of generated parametric frequency combs.
  • Fabrication of silicon-nitride microresonators.
  • Theoretical calculations to analyze pulse generation mechanisms, specifically soliton modelocking.

Main Results:

  • Observed a transition to a stable mode-locked state in the parametric frequency comb generation.
  • Demonstrated the generation of sub-200-femtosecond (fs) optical pulses.
  • Achieved a high repetition rate of 99 Gigahertz (GHz) for the generated pulses.

Conclusions:

  • Pulse generation in this silicon-nitride microresonator system is consistent with soliton modelocking.
  • Parametric devices show significant potential for producing ultra-short laser pulses.
  • Tunable pulse generation from visible to mid-infrared regimes at GHz to THz repetition rates is feasible.