Spatial coherence of an optical turbulent beam in a biased photorefractive crystal due to the spatiotemporal modulation instability
| Autor: | Ming-Feng Shih, Fang-Wen Sheu |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Physics
Turbulence business.industry Physics::Optics Pattern formation Self-focusing Instability Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Nonlinear system Optics Physics::Accelerator Physics Laser beam quality Electrical and Electronic Engineering Physical and Theoretical Chemistry business Self-phase modulation Coherence (physics) |
| Zdroj: | Optics Communications. 278:187-193 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2007.06.002 |
| Popis: | We report the experimental observation of the dynamic pattern formation of a broad coherent light beam in a biased photorefractive crystal due to the spatiotemporal modulation instability. When the nonlinearity exceeds a specific threshold, the coherent light beam not only breaks up into light spots due to the modulation instability but also fast fluctuates both spatially and temporally, forming an optical turbulent beam, which behaves as a quasi-homogeneous speckled beam or a partially incoherent beam. We investigate the spatial coherence property of an optical turbulent beam from the visibility of the averaged double-slit interference fringe. We also numerically demonstrate the visibility variation of the instantaneous interference fringe of an optical turbulent beam. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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