Coherent population transfer in NO with pulsed lasers: the consequences of hyperfine structure, Doppler broadening and electromagnetically induced absorption
Coherent population transfer between vibrational levels of the NO molecule induced by the interaction of two delayed laser pulses, also referred to as stimulated Raman scattering involving adiabatic passage (STIRAP), is studied experimentally in a molecular beam and in the bulk. The consequences of...
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| Format: | Journal article |
| Language: | English |
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1998
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| _version_ | 1797103472413245440 |
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| author | Kuhn, A Steuerwald, S Bergmann, K |
| author_facet | Kuhn, A Steuerwald, S Bergmann, K |
| author_sort | Kuhn, A |
| collection | OXFORD |
| description | Coherent population transfer between vibrational levels of the NO molecule induced by the interaction of two delayed laser pulses, also referred to as stimulated Raman scattering involving adiabatic passage (STIRAP), is studied experimentally in a molecular beam and in the bulk. The consequences of hyperfine splitting and Doppler broadening are discussed in detail. Unlike in previous studies of this kind, transfer occurs simultaneously between more than one group of non degenerate levels. In a molecular beam or in the bulk, the transfer efficiency of STIRAP exceeds that obtained by Stimulated Emission Pumping (SEP) by a factor of 3.6 or 15, respectively. We estimate the absolute transfer efficiency T in the beam to be T ≈ 60%, while T ≈ 18% is found in the bulk. In both cases, this is 60% of the maximum value expected from numerical studies. Possible reasons for this discrepancy are discussed. Finally we show that the absorption of a pump pulse in a weakly absorbing medium is significantly enhanced by the presence of a copropagating Stokes pulse when the Rabi frequency Ω S of the latter is smaller than the width of the Doppler profile Δν D. The relation of this observation to the phenomenon of Electromagnetically Induced Transparency (EIT), which is observed for Ω S ≫ Δν D, is also discussed. © EDP Sciences Springer-Verlag 1998. |
| first_indexed | 2024-03-07T06:20:37Z |
| format | Journal article |
| id | oxford-uuid:f2973b15-7c87-4802-bf7b-62892da1b1ab |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:20:37Z |
| publishDate | 1998 |
| record_format | dspace |
| spelling | oxford-uuid:f2973b15-7c87-4802-bf7b-62892da1b1ab2022-03-27T12:05:07ZCoherent population transfer in NO with pulsed lasers: the consequences of hyperfine structure, Doppler broadening and electromagnetically induced absorptionJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f2973b15-7c87-4802-bf7b-62892da1b1abEnglishSymplectic Elements at Oxford1998Kuhn, ASteuerwald, SBergmann, KCoherent population transfer between vibrational levels of the NO molecule induced by the interaction of two delayed laser pulses, also referred to as stimulated Raman scattering involving adiabatic passage (STIRAP), is studied experimentally in a molecular beam and in the bulk. The consequences of hyperfine splitting and Doppler broadening are discussed in detail. Unlike in previous studies of this kind, transfer occurs simultaneously between more than one group of non degenerate levels. In a molecular beam or in the bulk, the transfer efficiency of STIRAP exceeds that obtained by Stimulated Emission Pumping (SEP) by a factor of 3.6 or 15, respectively. We estimate the absolute transfer efficiency T in the beam to be T ≈ 60%, while T ≈ 18% is found in the bulk. In both cases, this is 60% of the maximum value expected from numerical studies. Possible reasons for this discrepancy are discussed. Finally we show that the absorption of a pump pulse in a weakly absorbing medium is significantly enhanced by the presence of a copropagating Stokes pulse when the Rabi frequency Ω S of the latter is smaller than the width of the Doppler profile Δν D. The relation of this observation to the phenomenon of Electromagnetically Induced Transparency (EIT), which is observed for Ω S ≫ Δν D, is also discussed. © EDP Sciences Springer-Verlag 1998. |
| spellingShingle | Kuhn, A Steuerwald, S Bergmann, K Coherent population transfer in NO with pulsed lasers: the consequences of hyperfine structure, Doppler broadening and electromagnetically induced absorption |
| title | Coherent population transfer in NO with pulsed lasers: the consequences of hyperfine structure, Doppler broadening and electromagnetically induced absorption |
| title_full | Coherent population transfer in NO with pulsed lasers: the consequences of hyperfine structure, Doppler broadening and electromagnetically induced absorption |
| title_fullStr | Coherent population transfer in NO with pulsed lasers: the consequences of hyperfine structure, Doppler broadening and electromagnetically induced absorption |
| title_full_unstemmed | Coherent population transfer in NO with pulsed lasers: the consequences of hyperfine structure, Doppler broadening and electromagnetically induced absorption |
| title_short | Coherent population transfer in NO with pulsed lasers: the consequences of hyperfine structure, Doppler broadening and electromagnetically induced absorption |
| title_sort | coherent population transfer in no with pulsed lasers the consequences of hyperfine structure doppler broadening and electromagnetically induced absorption |
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