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Pairwise Mode Locking in Dynamically Coupled Parametric Oscillators.

Leon Bello1, Marcello Calvanese Strinati2, Shai Ben-Ami1

  • 1Department of Physics and BINA Center of Nanotechnology, Bar-Ilan University, 52900 Ramat-Gan, Israel.

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|March 12, 2021
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Summary
This summary is machine-generated.

Researchers demonstrate "pairwise mode locking" in coupled parametric oscillators, an effect analogous to laser mode locking. This phenomenon enables broadband, multimode emission with high second-order coherence but no ultrashort pulses.

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Area of Science:

  • Nonlinear Optics
  • Quantum Optics
  • Wave Physics

Background:

  • Mode locking in lasers synchronizes frequency modes for ultrashort pulse generation.
  • Parametric oscillators are key components in nonlinear optics for frequency conversion.

Purpose of the Study:

  • To demonstrate an analogous collective effect to laser mode locking in coupled parametric oscillators.
  • To investigate the phenomenon of "pairwise mode locking" and its properties.

Main Methods:

  • Utilizing two coupled parametric oscillators within identical multimode cavities.
  • Modulating the coupling between oscillators in time at the cavity mode repetition rate.
  • Conducting a radio-frequency experiment to demonstrate pairwise mode locking.

Main Results:

  • Observed pairwise mode locking with many pairs of modes oscillating with a locked phase sum.
  • Achieved broadband emission over an octave with approximately 20 resonant mode-locked pairs.
  • Demonstrated high second-order coherence despite lacking first-order coherence and ultrashort pulses.

Conclusions:

  • Pairwise mode locking is a novel collective effect in coupled parametric oscillators.
  • This effect offers a new pathway for generating broadband, coherent radiation.
  • The findings have implications for advanced optical signal generation and manipulation.