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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Related Experiment Video

Updated: Aug 15, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Phase Nanoscopy with Correlated Frequency Combs.

Xiaobing Zhu1,2, Matthias Lenzner3, Jean-Claude Diels1,2

  • 1School of Optical Science and Engineering, University of New Mexico, Albuquerque, NM 87106, USA.

Sensors (Basel, Switzerland)
|January 8, 2023
PubMed
Summary
This summary is machine-generated.

Researchers achieved unprecedented phase sensitivity in sensors by using correlated frequency combs, resolving 0.4 nanoradian phase differences. This breakthrough in optical sensing technology nears the standard quantum limit.

Keywords:
gyroscopesinertial sensorsintracavity phase interferometrylaser sensorsprecision sensingultrafast

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Area of Science:

  • Optical physics
  • Quantum optics
  • Sensor technology

Background:

  • Phase measurements are crucial for various sensors but typically rely on amplitude changes.
  • Existing methods face limitations in sensitivity and precision.

Purpose of the Study:

  • To explore the limit sensitivity of phase measurement using relative frequency shifts of correlated frequency combs.
  • To demonstrate a novel sensing method with enhanced phase resolution.

Main Methods:

  • Generating correlated frequency combs in an Optical Parametric Oscillator (OPO).
  • Synchronous pumping of the OPO with femtosecond pulses.
  • Detecting phase changes via relative frequency shifts instead of amplitude changes.

Main Results:

  • Achieved a phase difference resolution of 0.4 nanoradians, an order of magnitude improvement over previous records.
  • Measured phase sensitivity close to the standard quantum limit (0.66 phase-photon number uncertainty product).
  • Identified key innovations including a stable OPO cavity, electronic locking, shorter pump laser cavity, and square pulse generation.

Conclusions:

  • The developed method offers superior phase sensitivity for various physical quantity measurements.
  • Future improvements in data acquisition and quantum squeezing can further enhance sensitivity beyond the standard quantum limit.