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Cesium microwave emission without population inversion.

F Levi1, A Godone, J Vanier

  • 1Istituto Elettrotecnico Nazionale \Galileo Ferraris Torino, Italy. levi@tf.ien.it

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 2, 2008
PubMed
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This study introduces a novel Cs coherent microwave emitter using coherent population trapping (CPT) without population inversion. This method achieves a frequency standard with minimal light shift and excellent stability.

Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Metrology

Background:

  • Traditional microwave frequency standards often suffer from light shifts and thermal noise limitations.
  • Achieving coherence in microwave emission without population inversion presents a significant challenge.

Purpose of the Study:

  • To describe the realization of a cesium (Cs) coherent microwave emitter using coherent population trapping (CPT).
  • To investigate the potential for a new type of microwave frequency standard with enhanced stability and reduced systematic effects.

Main Methods:

  • Utilizing coherent population trapping (CPT) in cesium vapor.
  • Employing laser radiation to establish coherence without population inversion.
  • Analyzing the radio frequency spectrum, emission profile width, and transient output power.

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Main Results:

  • Demonstrated a Cs coherent microwave emitter based on CPT principles.
  • Observed the radio frequency spectrum and emission characteristics of the microwave radiation.
  • Preliminary results indicate a frequency instability below 10(-12) at 1s integration time.

Conclusions:

  • The CPT approach enables a microwave frequency standard free from linear light shifts.
  • This technique offers a promising pathway towards highly stable and accurate microwave frequency standards.
  • The demonstrated performance suggests potential for improved metrological applications.