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Updated: Jun 9, 2025

A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
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Boltzmann optical thermometry for cryogenics.

Marek Zeman1,2, Philippe Camus1, Thierry Chanelière1

  • 1Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France.

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|October 21, 2024
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Summary
This summary is machine-generated.

This study introduces an optical method to measure cryogenic temperatures in erbium-doped crystals using electron spin. The technique also assesses interface thermal conductance in different cooling setups.

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Area of Science:

  • Quantum Optics
  • Condensed Matter Physics
  • Cryogenic Engineering

Background:

  • Accurate temperature measurement is crucial for quantum technologies and fundamental research at cryogenic temperatures.
  • Traditional thermometers face limitations in precision and localizability within complex cryogenic systems.
  • Erbium-doped crystals offer unique optical properties sensitive to thermal variations.

Purpose of the Study:

  • To develop and validate a non-contact optical thermometry technique for erbium-doped crystals.
  • To assess the potential of this method as a primary standard for cryogenic thermometry.
  • To measure the thermal interface conductance between dielectric crystals and cryostat cold plates.

Main Methods:

  • Probing electron spin population in an erbium-doped crystal under an applied magnetic field.
  • Utilizing optical spectroscopy to correlate spin states with local temperature.
  • Employing an auxiliary laser to induce controlled heating for interface conductance measurements.

Main Results:

  • Reliable extraction of sample temperature in the 2-7 Kelvin range.
  • Demonstration of the method's potential for primary cryogenic thermometry.
  • Successful measurement of interface conductance across different cooling configurations.

Conclusions:

  • The proposed optical technique provides accurate local temperature measurements in cryogenic environments.
  • This method shows promise as a primary standard for cryogenic thermometry.
  • The technique enables characterization of thermal properties crucial for cryostat design and performance optimization.