Electromagnetically induced transparency and light storage in optically dense atomic vapour
<p>This thesis set out to investigate light storage based on dynamic electromagnetically induced transparency (EIT) in a room-temperature atomic ensemble of rubidium as a means to provide a quantum memory for single-photons created by a single rubidium atom coupled to a high-finesse optical re...
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| Format: | Thesis |
| Language: | English |
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2015
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| _version_ | 1797094270460493824 |
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| author | Langfahl-Klabes, G |
| author2 | Kuhn, A |
| author_facet | Kuhn, A Langfahl-Klabes, G |
| author_sort | Langfahl-Klabes, G |
| collection | OXFORD |
| description | <p>This thesis set out to investigate light storage based on dynamic electromagnetically induced transparency (EIT) in a room-temperature atomic ensemble of rubidium as a means to provide a quantum memory for single-photons created by a single rubidium atom coupled to a high-finesse optical resonator.</p> <p>Setting up the light storage medium presented a new addition to the research group's portfolio of experimental techniques and led to investigations of EIT, slow light and stored light in warm rubidium-87 vapour. Lambda level schemes connecting Zeeman or hyperfine substates on the D<sub>1</sub> and D<sub>2</sub> lines were addressed in rubidium vapour cells containing different buffer gases and different isotopic fractions of rubidium-87 and rubidium-85.</p> <p>Single beam spectroscopy with a weak probe was used to characterise the vapour cells. A numerical method to fit the D line spectrum to a theoretical model to include isotopic fractions and collisional broadening of a buffer gas has been implemented. Temperature and isotopic fractions could be reliably extracted from the fit parameters.</p> <p>For an offset-stabilisation of two lasers to address a lambda level scheme connecting the two different hyperfine groundstates in rubidium a phase locked loop including a frequency divider has been designed and implemented.</p> <p>Light storage and retrieval has been demonstrated using a Zeeman scheme on the D1 line. Two microsecond long classical light pulses containing one million photons on average were stored and retrieved with an efficiency of 15% after a delay of one microsecond.</p> <p>Several methods of attenuating the strong co-propagating control laser beam to allow for lowering the signal pulse intensity in future experiments are discussed.</p> |
| first_indexed | 2024-03-07T04:11:45Z |
| format | Thesis |
| id | oxford-uuid:c80ca0d3-7e99-4d0c-aece-d1bde7fc2e73 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:11:45Z |
| publishDate | 2015 |
| record_format | dspace |
| spelling | oxford-uuid:c80ca0d3-7e99-4d0c-aece-d1bde7fc2e732022-03-27T06:49:33ZElectromagnetically induced transparency and light storage in optically dense atomic vapourThesishttp://purl.org/coar/resource_type/c_db06uuid:c80ca0d3-7e99-4d0c-aece-d1bde7fc2e73Laser SpectroscopyQuantum information processingAtomic and laser physicsEnglishOxford University Research Archive - Valet2015Langfahl-Klabes, GKuhn, A<p>This thesis set out to investigate light storage based on dynamic electromagnetically induced transparency (EIT) in a room-temperature atomic ensemble of rubidium as a means to provide a quantum memory for single-photons created by a single rubidium atom coupled to a high-finesse optical resonator.</p> <p>Setting up the light storage medium presented a new addition to the research group's portfolio of experimental techniques and led to investigations of EIT, slow light and stored light in warm rubidium-87 vapour. Lambda level schemes connecting Zeeman or hyperfine substates on the D<sub>1</sub> and D<sub>2</sub> lines were addressed in rubidium vapour cells containing different buffer gases and different isotopic fractions of rubidium-87 and rubidium-85.</p> <p>Single beam spectroscopy with a weak probe was used to characterise the vapour cells. A numerical method to fit the D line spectrum to a theoretical model to include isotopic fractions and collisional broadening of a buffer gas has been implemented. Temperature and isotopic fractions could be reliably extracted from the fit parameters.</p> <p>For an offset-stabilisation of two lasers to address a lambda level scheme connecting the two different hyperfine groundstates in rubidium a phase locked loop including a frequency divider has been designed and implemented.</p> <p>Light storage and retrieval has been demonstrated using a Zeeman scheme on the D1 line. Two microsecond long classical light pulses containing one million photons on average were stored and retrieved with an efficiency of 15% after a delay of one microsecond.</p> <p>Several methods of attenuating the strong co-propagating control laser beam to allow for lowering the signal pulse intensity in future experiments are discussed.</p> |
| spellingShingle | Laser Spectroscopy Quantum information processing Atomic and laser physics Langfahl-Klabes, G Electromagnetically induced transparency and light storage in optically dense atomic vapour |
| title | Electromagnetically induced transparency and light storage in optically dense atomic vapour |
| title_full | Electromagnetically induced transparency and light storage in optically dense atomic vapour |
| title_fullStr | Electromagnetically induced transparency and light storage in optically dense atomic vapour |
| title_full_unstemmed | Electromagnetically induced transparency and light storage in optically dense atomic vapour |
| title_short | Electromagnetically induced transparency and light storage in optically dense atomic vapour |
| title_sort | electromagnetically induced transparency and light storage in optically dense atomic vapour |
| topic | Laser Spectroscopy Quantum information processing Atomic and laser physics |
| work_keys_str_mv | AT langfahlklabesg electromagneticallyinducedtransparencyandlightstorageinopticallydenseatomicvapour |