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Unidirectional ring-laser operation using sum-frequency mixing.

Peter Tidemand-Lichtenberg1, Haynes Pak Hay Cheng, Christian Pedersen

  • 1DTU Fotonik, Technical University of Denmark, DK-4000 Roskilde, Denmark. ptli@fotonik.dtu.dk

Optics Letters
|August 4, 2010
PubMed
Summary
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A new technique uses sum-frequency mixing to create a loss difference, ensuring stable unidirectional lasing in ring lasers. This method is broadly applicable for various laser wavelengths.

Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • Ring lasers can operate in two counterpropagating directions, leading to instability.
  • Achieving stable unidirectional operation is crucial for many laser applications.

Purpose of the Study:

  • To propose and demonstrate a novel technique for enforcing unidirectional operation in ring lasers.
  • To investigate the underlying mechanism of parametric loss for stable single-direction lasing.

Main Methods:

  • Utilizing sum-frequency mixing between a single-pass laser and one intracavity field.
  • Introducing a parametric loss mechanism to create an asymmetry in cavity losses.
  • Numerical modeling and experimental validation on a diode-pumped solid-state 1342nm continuous-wave ring laser.

Main Results:

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  • Successfully demonstrated stable unidirectional lasing in a ring laser.
  • The sum-frequency mixing method effectively created a loss difference between counterpropagating fields.
  • The technique showed robustness and applicability for various wavelengths with suitable nonlinear materials.

Conclusions:

  • The proposed sum-frequency mixing technique provides a generic and effective method for achieving stable unidirectional operation in ring lasers.
  • This approach offers a versatile solution for applications requiring single-direction laser output.