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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Delay induced high order locking effects in semiconductor lasers.

B Kelleher1, M J Wishon2, A Locquet2

  • 1Department of Physics, University College Cork, Cork, Ireland.

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Summary
This summary is machine-generated.

Optical feedback in semiconductor lasers introduces a new time scale, enabling resonances with relaxation oscillations. This phenomenon leads to spontaneous mode-locking in lasers with highly damped oscillations, confirmed in quantum dot and quantum well devices.

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Area of Science:

  • Nonlinear Dynamics
  • Semiconductor Laser Physics
  • Photonics

Background:

  • Nonlinear dynamical systems often exhibit multiple time scales.
  • Semiconductor lasers possess intrinsic time scales: cavity repetition rate and relaxation oscillation frequency.
  • Optical feedback introduces an external cavity repetition rate, a significantly longer time scale.

Purpose of the Study:

  • To investigate the impact of optical feedback on semiconductor laser dynamics.
  • To explore the potential for resonances between relaxation oscillations and the external cavity repetition rate.
  • To demonstrate spontaneous mode-locking induced by these resonances.

Main Methods:

  • Experimental analysis of quantum dot and quantum well semiconductor lasers.
  • Inclusion of optical feedback to introduce an external cavity time scale.
  • Theoretical modeling using a rate equation approach.

Main Results:

  • Resonances between relaxation oscillations and the external cavity repetition rate were achieved in lasers with highly damped oscillations.
  • Spontaneous mode-locking was observed as a direct consequence of these resonances.
  • Experimental results from quantum dot and quantum well lasers showed qualitatively identical dynamics.
  • A rate equation model demonstrated excellent agreement with experimental findings.

Conclusions:

  • Optical feedback is a viable method to induce resonances and spontaneous mode-locking in semiconductor lasers.
  • The dynamics are consistent across different semiconductor laser types (quantum dot and quantum well).
  • Rate equation models accurately capture the observed multiple time scale dynamics and mode-locking phenomena.