Experimental study of speckle patterns generated by low-coherence semiconductor laser light
Speckle is a wave interference phenomenon that has been studied in various fields, including optics, hydrodynamics, and acoustics. Speckle patterns contain spectral information of the interfering waves and of the scattering medium that generates the pattern. Here, we study experimentally the speckle...
| Autores: | , , , , |
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| Formato: | artículo |
| Fecha de publicación: | 2020 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/329164 |
| Acesso em linha: | https://hdl.handle.net/2117/329164 https://dx.doi.org/10.1063/5.0006007 |
| Access Level: | acceso abierto |
| Palavra-chave: | Semiconductor lasers Signal processing Interference (Light) Instabilities and Nonequilibrium Structures Coherence Interference Optical properties Làsers de semiconductors Tractament del senyal Interferència (Llum) Àrees temàtiques de la UPC::Física |
| Resumo: | Speckle is a wave interference phenomenon that has been studied in various fields, including optics, hydrodynamics, and acoustics. Speckle patterns contain spectral information of the interfering waves and of the scattering medium that generates the pattern. Here, we study experimentally the speckle patterns generated by the light emitted by two types of semiconductor lasers: conventional laser diodes, where we induce low-coherence emission by optical feedback or by pump current modulation, and coupled nanolasers. In both cases, we analyze the intensity statistics of the respective speckle patterns to inspect the degree of coherence of the light. We show that the speckle analysis provides a non-spectral way to assess the coherence of semiconductor laser light. |
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