NONLINEAR EXCITONIC OPTICAL-ABSORPTION IN GASB
We have measured the saturation of optical absorption in GaSb at wavelengths close to the band gap, and have determined the nonlinear absorption (α2) and refraction (n2) coefficients. At liquid-helium temperature a sharp free-exciton absorption line is observed which saturates with increasing incide...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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1987
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| _version_ | 1797056283765899264 |
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| author | Fox, A Maciel, A Ryan, J Kerr, T |
| author_facet | Fox, A Maciel, A Ryan, J Kerr, T |
| author_sort | Fox, A |
| collection | OXFORD |
| description | We have measured the saturation of optical absorption in GaSb at wavelengths close to the band gap, and have determined the nonlinear absorption (α2) and refraction (n2) coefficients. At liquid-helium temperature a sharp free-exciton absorption line is observed which saturates with increasing incident laser intensity; we obtain values ∥α2∥=70 cm W-1 and ∥n 2∥≊0.2 cm2 kW-1. At room temperature we do not observe a well-defined exciton; saturation of the residual interband absorption occurs at much higher intensity, and it is found to be obscured by strong thermal effects. |
| first_indexed | 2024-03-06T19:21:12Z |
| format | Journal article |
| id | oxford-uuid:1a267f8e-4283-4da3-b774-d44fadcd17a4 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:21:12Z |
| publishDate | 1987 |
| record_format | dspace |
| spelling | oxford-uuid:1a267f8e-4283-4da3-b774-d44fadcd17a42022-03-26T10:53:13ZNONLINEAR EXCITONIC OPTICAL-ABSORPTION IN GASBJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1a267f8e-4283-4da3-b774-d44fadcd17a4EnglishSymplectic Elements at Oxford1987Fox, AMaciel, ARyan, JKerr, TWe have measured the saturation of optical absorption in GaSb at wavelengths close to the band gap, and have determined the nonlinear absorption (α2) and refraction (n2) coefficients. At liquid-helium temperature a sharp free-exciton absorption line is observed which saturates with increasing incident laser intensity; we obtain values ∥α2∥=70 cm W-1 and ∥n 2∥≊0.2 cm2 kW-1. At room temperature we do not observe a well-defined exciton; saturation of the residual interband absorption occurs at much higher intensity, and it is found to be obscured by strong thermal effects. |
| spellingShingle | Fox, A Maciel, A Ryan, J Kerr, T NONLINEAR EXCITONIC OPTICAL-ABSORPTION IN GASB |
| title | NONLINEAR EXCITONIC OPTICAL-ABSORPTION IN GASB |
| title_full | NONLINEAR EXCITONIC OPTICAL-ABSORPTION IN GASB |
| title_fullStr | NONLINEAR EXCITONIC OPTICAL-ABSORPTION IN GASB |
| title_full_unstemmed | NONLINEAR EXCITONIC OPTICAL-ABSORPTION IN GASB |
| title_short | NONLINEAR EXCITONIC OPTICAL-ABSORPTION IN GASB |
| title_sort | nonlinear excitonic optical absorption in gasb |
| work_keys_str_mv | AT foxa nonlinearexcitonicopticalabsorptioningasb AT maciela nonlinearexcitonicopticalabsorptioningasb AT ryanj nonlinearexcitonicopticalabsorptioningasb AT kerrt nonlinearexcitonicopticalabsorptioningasb |