Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap
We characterize the anisotropic differential ac-Stark shift for the Dy 626 nm intercombination transition, induced in a far-detuned 1070 nm optical dipole trap, and observe the existence of a “magic polarization” for which the polarizabilities of the ground and excited states are equal. From our mea...
| Main Authors: | , , , , , , , , , , |
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| Format: | Journal article |
| Published: |
American Physical Society
2018
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| _version_ | 1797087751305166848 |
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| author | Chalopin, T Makhalov, V Bouazza, C Evrard, A Barker, A Lepers, M Wyart, J Dulieu, O Dalibard, J Lopes, R Nascimbene, S |
| author_facet | Chalopin, T Makhalov, V Bouazza, C Evrard, A Barker, A Lepers, M Wyart, J Dulieu, O Dalibard, J Lopes, R Nascimbene, S |
| author_sort | Chalopin, T |
| collection | OXFORD |
| description | We characterize the anisotropic differential ac-Stark shift for the Dy 626 nm intercombination transition, induced in a far-detuned 1070 nm optical dipole trap, and observe the existence of a “magic polarization” for which the polarizabilities of the ground and excited states are equal. From our measurements we extract both the scalar and tensorial components of the dynamic dipole polarizability for the excited state, αsE=188(12)α0 and αtE=34(12)α0, respectively, where α 0 is the atomic unit for the electric polarizability. We also provide a theoretical model allowing us to predict the excited state polarizability and find qualitative agreement with our observations. Furthermore, we utilize our findings to optimize the efficiency of Doppler cooling of a trapped gas, by controlling the sign and magnitude of the inhomogeneous broadening of the optical transition. The resulting initial gain of the collisional rate allows us, after forced evaporation cooling, to produce a quasipure Bose-Einstein condensate of 162Dy with 3×104 atoms. |
| first_indexed | 2024-03-07T02:40:09Z |
| format | Journal article |
| id | oxford-uuid:aa28600d-c2ed-4155-a192-907c56b0da9e |
| institution | University of Oxford |
| last_indexed | 2024-03-07T02:40:09Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:aa28600d-c2ed-4155-a192-907c56b0da9e2022-03-27T03:13:24ZAnisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trapJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:aa28600d-c2ed-4155-a192-907c56b0da9eSymplectic Elements at OxfordAmerican Physical Society2018Chalopin, TMakhalov, VBouazza, CEvrard, ABarker, ALepers, MWyart, JDulieu, ODalibard, JLopes, RNascimbene, SWe characterize the anisotropic differential ac-Stark shift for the Dy 626 nm intercombination transition, induced in a far-detuned 1070 nm optical dipole trap, and observe the existence of a “magic polarization” for which the polarizabilities of the ground and excited states are equal. From our measurements we extract both the scalar and tensorial components of the dynamic dipole polarizability for the excited state, αsE=188(12)α0 and αtE=34(12)α0, respectively, where α 0 is the atomic unit for the electric polarizability. We also provide a theoretical model allowing us to predict the excited state polarizability and find qualitative agreement with our observations. Furthermore, we utilize our findings to optimize the efficiency of Doppler cooling of a trapped gas, by controlling the sign and magnitude of the inhomogeneous broadening of the optical transition. The resulting initial gain of the collisional rate allows us, after forced evaporation cooling, to produce a quasipure Bose-Einstein condensate of 162Dy with 3×104 atoms. |
| spellingShingle | Chalopin, T Makhalov, V Bouazza, C Evrard, A Barker, A Lepers, M Wyart, J Dulieu, O Dalibard, J Lopes, R Nascimbene, S Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap |
| title | Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap |
| title_full | Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap |
| title_fullStr | Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap |
| title_full_unstemmed | Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap |
| title_short | Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap |
| title_sort | anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far detuned dipole trap |
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