Direct single-shot observation of millimeter-wave superradiance in Rydberg-Rydberg transitions
We have directly detected millimeter-wave (mm-wave) free-space superradiant emission from Rydberg states (principal quantum number n∼30) of barium atoms in single-shot experiments. We trigger the cooperative effects with a weak initial pulse and detect the time-dependent amplitude and phase of the e...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/115231 https://orcid.org/0000-0002-5567-7890 https://orcid.org/0000-0002-6991-683X https://orcid.org/0000-0002-9363-9844 https://orcid.org/0000-0002-7609-4205 |
| Summary: | We have directly detected millimeter-wave (mm-wave) free-space superradiant emission from Rydberg states (principal quantum number n∼30) of barium atoms in single-shot experiments. We trigger the cooperative effects with a weak initial pulse and detect the time-dependent amplitude and phase of the emitted radiation with single-shot sensitivity and 20 ps time resolution. This allows measurement and shot-by-shot analysis of the statistical distribution of decay rates, time delays, and time-dependent frequency shifts. Cooperative line shifts and decay rates are observed that exceed the 250 kHz Doppler width by a factor of 20 and the 50 Hz spontaneous emission rate by a factor of 10⁵. |
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