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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
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Vibrational Two-Photon Emission from Coherently Excited Solid Parahydrogen.
Yuki Miyamoto1, Hideaki Hara1, Takahiko Masuda1
1Research Institute for Interdisciplinary Science, Okayama University , Okayama 700-8530, Japan.
The Journal of Physical Chemistry. A
|May 2, 2017
Summary
We observed two-photon emission from solid parahydrogen, a quantum solid, persisting long after excitation due to its long vibrational coherence time. This quantum phenomenon is sensitive to temperature and impurities.
Area of Science:
- Quantum optics
- Condensed matter physics
- Solid-state spectroscopy
Background:
- Solid parahydrogen is a quantum solid exhibiting unique quantum properties.
- Coherent excitation of vibrational states is crucial for observing quantum phenomena.
- Two-photon emission is a nonlinear optical process with applications in quantum information.
Purpose of the Study:
- To investigate two-photon emission from coherently excited vibrational states in solid parahydrogen.
- To explore the role of coherence and decoherence times in this process.
- To understand the influence of external factors like temperature and impurities.
Main Methods:
- Coherent excitation of vibrational states using stimulated Raman scattering with visible laser pulses.
- Triggering two-photon emission using a mid-infrared laser pulse.
- Varying the timing of the trigger pulse relative to the excitation pulses.
Main Results:
- Observed persistent two-photon emission long after excitation, indicating a long decoherence time.
- Emission intensity increased even after excitation pulses passed, suggesting coherence development.
- Coherence development was suppressed at higher temperatures and orthohydrogen concentrations.
- Observed effects of target annealing and laser-induced damage.
Conclusions:
- Solid parahydrogen exhibits exceptionally long vibrational coherence times.
- Two-photon emission is a sensitive probe of quantum coherence in solid-state systems.
- Temperature and impurities significantly impact quantum coherence dynamics in solid parahydrogen.
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