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Three-port beam splitters-combiners for interferometer applications.

R Schnabel1, A Bunkowski, O Burmeister

  • 1Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Universität Hannover, Callinstrasse 38, 30167 Hannover, Germany. roman.schnabel@aei.mpg.de

Optics Letters
|March 31, 2006
PubMed
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This study introduces coupling relations for beam splitters, enabling efficient optical signal separation. These relations are applied to Fabry-Perot cavities for advanced mode cleaning and signal isolation.

Area of Science:

  • Optics and Photonics
  • Interferometry
  • Optical Engineering

Background:

  • Beam splitters and combiners are fundamental optical components.
  • Fabry-Perot cavities are widely used in various optical systems.
  • Efficient coupling and signal separation are crucial for optical device performance.

Purpose of the Study:

  • To derive generic phase and amplitude coupling relations for three-port beam splitters-combiners.
  • To apply these relations to a reflection grating coupler for a Fabry-Perot ring cavity.
  • To analyze the performance of the coupled interferometer as a mode cleaner and for signal separation.

Main Methods:

  • Derivation of coupling relations using fundamental optical principles.
  • Application of derived relations to a specific reflection grating coupler design.

Related Experiment Videos

  • Analysis of the interferometer's behavior in impedance-matched and undercoupled regimes.

    • Main Results:

    • Generic coupling relations for three-port beam splitters-combiners were successfully derived.
    • The reflection grating coupler enables the Fabry-Perot ring cavity to function as an all-reflective ring mode cleaner when impedance-matched.
    • In the highly undercoupled case, near-complete separation of carrier power and phase signal from cavity strain is achievable.

    Conclusions:

    • The derived coupling relations provide a versatile tool for designing and analyzing optical systems involving three-port beam splitters.
    • The proposed Fabry-Perot ring cavity configuration offers effective mode cleaning and precise signal separation capabilities.
    • This work contributes to advancements in optical sensing and signal processing technologies.