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Fiber cavities with integrated mode matching optics.

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  • 1Department of Physics and Astronomy, University of Sussex, Falmer, BN1 9QH, UK. G.K.Gulati@sussex.ac.uk.

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|July 19, 2017
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Summary

We developed a novel fiber assembly to improve spatial mode matching in fiber-based Fabry-Pérot Cavities (FFPCs). This versatile method enhances FFPC performance by achieving 90% mode matching, overcoming a key limitation for various applications.

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Area of Science:

  • Optics and Photonics
  • Fiber Optics
  • Cavity Physics

Background:

  • Spatial mode matching is crucial for efficient operation of fiber-based Fabry-Pérot Cavities (FFPCs).
  • Limited mode matching between cavity and input/output modes hinders FFPC applications.
  • Conventional FFPCs coupled with single-mode fibers face challenges, especially at longer cavity lengths.

Purpose of the Study:

  • To demonstrate a versatile and highly efficient mode matching method for FFPCs.
  • To overcome the spatial mode mismatch limitation in FFPCs.
  • To enhance the performance and applicability of FFPCs.

Main Methods:

  • Designed an all-fiber assembly comprising a graded-index and large core multimode fiber spliced to a single mode fiber.
  • Utilized this assembly to transform the single-mode fiber's propagating mode to match the FFPC's cavity mode.
  • Investigated the mode matching efficiency across different FFPC configurations.

Main Results:

  • Achieved a significant mode matching efficiency of 90% for a cavity length of approximately 400 μm.
  • Demonstrated a substantial improvement compared to conventional FFPCs using only single-mode fiber coupling.
  • Showcased the versatility of the method by matching the fundamental cavity mode with various single-mode fibers.

Conclusions:

  • The novel all-fiber assembly provides a versatile and integrable solution for enhancing spatial mode matching in FFPCs.
  • This method significantly improves FFPC performance, particularly for longer cavity lengths.
  • The approach offers broad applicability for various FFPC-based technologies.