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A cryogenic optical feedthrough using polarization maintaining fibers.

M J Nelson1, C J Collins1, C C Speake1

  • 1School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.

The Review of Scientific Instruments
|April 3, 2016
PubMed
Summary

This study demonstrates a novel feedthrough assembly for polarization maintaining fibers, enabling sensitive cryogenic measurements. The design overcomes thermal stress limitations, achieving high sensitivity in polarization-based interferometry.

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Area of Science:

  • Optical Physics
  • Cryogenic Engineering
  • Materials Science

Background:

  • Polarization maintaining optical fibers are crucial for transmitting polarized light but struggle in cryogenic settings due to thermal stress.
  • Existing limitations hinder the application of these fibers in low-temperature environments.

Purpose of the Study:

  • To investigate the impact of thermal stress on polarization maintaining fibers in cryogenic conditions.
  • To develop and test a feedthrough assembly for transmitting light in cryogenic environments.
  • To assess the performance of a polarization-based interferometer using this assembly.

Main Methods:

  • Experimental investigation of thermal stress effects on polarization maintaining fibers.
  • Modeling fiber behavior using Jones matrices.
  • Design, construction, and testing of a specialized feedthrough and fiber termination assembly.
  • Integration with a homodyne polarization-based interferometer in a cryogenic vacuum.

Main Results:

  • Characterization of thermal stress effects on polarization maintaining fiber properties.
  • Demonstration of a functional feedthrough assembly for cryogenic applications.
  • Achieved a sensitivity of 8 × 10⁻¹⁰ rad/√Hz at 0.05 Hz with the interferometer at cryogenic temperatures.

Conclusions:

  • The developed feedthrough assembly effectively maintains polarization in cryogenic environments.
  • The system enables high-sensitivity measurements in challenging low-temperature conditions.
  • This work expands the utility of polarization maintaining fibers in scientific instrumentation.