OPTICAL SPECKLE-FIELD VISIBILITY DIMINISHING BY REDUCTION OF A TEMPORAL COHERENCE
Mikhaylo Vasnetsov
Institute of Physics of the National Academy of Sciences of Ukraine (Ukraine)
https://orcid.org/0000-0002-8634-4896
Valeriy Voytsekhovich
Institute of Physics of the National Academy of Sciences of Ukraine (Ukraine)
https://orcid.org/0000-0002-7196-729X
Vladislav Ponevchinsky
Institute of Physics of the National Academy of Sciences of Ukraine (Ukraine)
https://orcid.org/0009-0003-7250-3619
Nataliia Kachalova
1Institute of Physics of the National Academy of Sciences of Ukraine; 2L.M. Litvinenko Institute of Physical and Organic Chemistry and Carbon Chemistry of the National Academy of Sciences of Ukraine (Ukraine)
https://orcid.org/0000-0002-9956-5380
Alina Khodko
Institute of Physics of the National Academy of Sciences of Ukraine (Ukraine)
https://orcid.org/0000-0001-5685-1013
Oleksanr Mamuta
Institute of Physics of the National Academy of Sciences of Ukraine (Ukraine)
https://orcid.org/0000-0002-6404-5879
Volodymyr Pavlov
machinehead6926@gmail.comVinnitsia National Technical University (Ukraine)
https://orcid.org/0000-0002-0717-7082
Vadym Khomenko
Institute of Physics of the National Academy of Sciences of Ukraine (Ukraine)
https://orcid.org/0000-0002-7926-9277
Natalia Manicheva
Odessа Polytechnic National University (Ukraine)
https://orcid.org/0000-0002-3043-5342
Abstract
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.
Keywords:
speckle field, coherence, visibilityReferences
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Authors
Mikhaylo VasnetsovInstitute of Physics of the National Academy of Sciences of Ukraine Ukraine
https://orcid.org/0000-0002-8634-4896
Authors
Valeriy VoytsekhovichInstitute of Physics of the National Academy of Sciences of Ukraine Ukraine
https://orcid.org/0000-0002-7196-729X
Authors
Vladislav PonevchinskyInstitute of Physics of the National Academy of Sciences of Ukraine Ukraine
https://orcid.org/0009-0003-7250-3619
Authors
Nataliia Kachalova1Institute of Physics of the National Academy of Sciences of Ukraine; 2L.M. Litvinenko Institute of Physical and Organic Chemistry and Carbon Chemistry of the National Academy of Sciences of Ukraine Ukraine
https://orcid.org/0000-0002-9956-5380
Authors
Alina KhodkoInstitute of Physics of the National Academy of Sciences of Ukraine Ukraine
https://orcid.org/0000-0001-5685-1013
Authors
Oleksanr MamutaInstitute of Physics of the National Academy of Sciences of Ukraine Ukraine
https://orcid.org/0000-0002-6404-5879
Authors
Volodymyr Pavlovmachinehead6926@gmail.com
Vinnitsia National Technical University Ukraine
https://orcid.org/0000-0002-0717-7082
Authors
Vadym KhomenkoInstitute of Physics of the National Academy of Sciences of Ukraine Ukraine
https://orcid.org/0000-0002-7926-9277
Authors
Natalia ManichevaOdessа Polytechnic National University Ukraine
https://orcid.org/0000-0002-3043-5342
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