OPTICAL SPECKLE-FIELD VISIBILITY DIMINISHING BY REDUCTION OF A TEMPORAL COHERENCE
| Autor: | Mikhaylo Vasnetsov, Valeriy Voytsekhovich, Vladislav Ponevchinsky, Nataliia Kachalova, Alina Khodko, Oleksanr Mamuta, Volodymyr Pavlov, Vadym Khomenko, Natalia Manicheva |
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| Jazyk: | English<br />Polish |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska, Vol 14, Iss 1 (2024) |
| Druh dokumentu: | article |
| ISSN: | 2083-0157 2391-6761 |
| DOI: | 10.35784/iapgos.5495 |
| Popis: | The paper is a report of an experimental study to suppress the speckle structure of a coherent optical field. The technique proposed is based on the reduction of the temporal coherence utilizing enriching the output spectrum of Nd:YVO4 laser with intra-cavity second harmonic generation by additional emission lines. Temperature-controlled simultaneous emission of two components at 1.063 mm and 1.066 mm with nearly equal intensities in IR is achived. In the second-harmonic output the emission lines 531.7 nm, 532.3 nm and 532.8 nm were recorded. The influence of the spectrum variation on the formation of a speckle field was checked. Successfully removed intensity zeros and reduced contrast (visibility) from 0.92 to 0.65 in a light scattered by a ground glass diffuser at the angle 35°. A simple consideration of the speckle field dumping mechanism is presented. |
| Databáze: | Directory of Open Access Journals |
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