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Broadband Phase Spectroscopy over Turbulent Air Paths
Fabrizio R Giorgetta1, Gregory B Rieker1, Esther Baumann1
1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Physical Review Letters
|September 19, 2015
Summary
This study introduces adaptive compensation for atmospheric turbulence in dual-comb spectroscopy, enabling precise broadband atmospheric phase spectra measurement. This breakthrough allows for sensitive trace gas detection and full complex susceptibility analysis in open-path sensing.
Area of Science:
- Atmospheric optics
- Spectroscopy
- Quantum optics
Background:
- Atmospheric turbulence causes decoherence, limiting broadband spectroscopy.
- Dual-comb spectroscopy offers high speed and frequency stability.
- Conventional spectroscopy measures only intensity absorption.
Purpose of the Study:
- To develop a method for acquiring broadband atmospheric phase spectra.
- To implement adaptive compensation for atmospheric turbulence.
- To enable precise trace gas concentration measurements using phase spectra.
Main Methods:
- Phase-sensitive dual-frequency-comb spectrometer.
- Adaptive compensation for turbulence-induced decoherence.
- Measurement across 2 km open-air path with 70,000 comb teeth.
Main Results:
- Submilliradian uncertainty in phase spectra, achieving 10(-13) refractive index sensitivity.
- Trace gas concentrations (CO2) measured with 0.7 ppm uncertainty.
- Demonstration of full complex susceptibility measurement, not just absorption.
Conclusions:
- Adaptive compensation overcomes atmospheric turbulence limitations in dual-comb spectroscopy.
- This technique enables high-precision open-path sensing of atmospheric composition.
- The method advances broadband spectroscopy for environmental monitoring and analysis.
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