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Excess-noise dependence on intracavity aperture shape.

G P Karman1, G S McDonald, J P Woerdman

  • 1Philips Research Laboratories, Prof Holstlaan 4, 5656 AA Eindhoven, The Netherlands. gerwin.karman@philips.com

Applied Optics
|March 8, 2008
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The excess-noise factor (K) in lasers with nonorthogonal eigenmodes significantly depends on aperture shape. This study details how triangular, square, and hexagonal apertures affect laser noise, offering insights into laser stability.

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Area of Science:

  • Laser physics
  • Optical engineering
  • Quantum optics

Background:

  • Nonorthogonal eigenmodes in lasers can lead to high excess-noise factors (K).
  • Unstable-cavity lasers with hard-edged apertures are particularly susceptible to increased noise.
  • The influence of aperture shape on laser noise has not been extensively studied.

Purpose of the Study:

  • To investigate the dependence of the excess-noise factor (K) on aperture shape in unstable-cavity lasers.
  • To provide the first detailed study on this relationship.
  • To correlate noise characteristics with specific aperture geometries.

Main Methods:

  • Numerical calculations of the excess-noise factor (K).
  • Experimental measurements of K in lasers with various aperture shapes.
  • Analysis of aperture geometries including triangular, square, pentagonal, hexagonal, octagonal, and rhomboid.

Main Results:

  • Both the magnitude and resonant behavior of K are strongly dependent on aperture shape.
  • Specific shapes like triangular and hexagonal apertures show distinct effects on K.
  • The observed dependencies can be largely explained by one-dimensional resonance lengths.

Conclusions:

  • Aperture shape is a critical parameter influencing excess noise in unstable-cavity lasers.
  • Understanding this dependence allows for better control of laser noise.
  • One-dimensional resonance models provide a useful framework for explaining noise behavior related to aperture shape.