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Stable coherent mode-locking based on [Formula: see text] pulse formation in single-section lasers.

Rostislav Arkhipov1,2,3, Anton Pakhomov2, Mikhail Arkhipov1,2

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We demonstrate stable, self-starting coherent mode-locking (CML) in single-section lasers, challenging the norm of two-section designs. This breakthrough enables shorter pulse durations, including few-cycle pulses.

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Area of Science:

  • Laser physics
  • Quantum optics
  • Nonlinear dynamics

Background:

  • Coherent mode-locking (CML) typically requires two-section lasers (gain and absorber).
  • Existing CML regimes are limited by atomic population and phase relaxation times.
  • Rabi oscillations are key to understanding CML dynamics.

Purpose of the Study:

  • To investigate CML regimes in single-section lasers.
  • To identify conditions for stable, self-starting CML in simplified laser systems.
  • To explore the potential for generating ultrashort (few-cycle) pulses.

Main Methods:

  • Theoretical analysis of laser dynamics.
  • Modeling of coherent Rabi oscillations in atomic inversion.
  • Investigation of cavity length and relaxation parameter effects.

Main Results:

  • Stable CML achieved in a single-section gain laser.
  • Mode-locking is unconditionally self-starting.
  • CML arises from a balance between intra-pulse de-excitation and pump-induced relaxation.
  • Possibility of mode-locking for few-cycle pulses demonstrated.

Conclusions:

  • Single-section lasers can support stable CML, simplifying laser design.
  • The findings pave the way for generating ultrashort laser pulses.
  • Understanding relaxation dynamics is crucial for advanced laser mode-locking.