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Open AccessFeature PaperArticle

The Excitation of Ultrasound by Laser Radiation in Water Using an Optical Fiber Laser Converter with a 2D Colloidal Crystalline Coating

Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS) 46 Uljanov Street, 603950 Nizhny Novgorod, Russia
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Coatings 2019, 9(12), 857; https://doi.org/10.3390/coatings9120857
Received: 30 September 2019 / Revised: 3 December 2019 / Accepted: 11 December 2019 / Published: 14 December 2019
(This article belongs to the Special Issue Design, Manufacturing and Measurement of Optical Film Coatings)
The technology of applying a colloidal single-layer coating of transparent polystyrene (PS) Ø 1 μm spheres at the tip face of a quartz fiber has been proposed and tested. Such a coating plays, in a light absorbing liquid, the role of a converter of pulsed laser radiation into acoustic radiation. The generation of ultrasound in water using a converter based on a quartz fiber 1 mm in diameter with a 2D colloidal crystalline coating consisted of polystyrene spheres with a diameter of ~1 μm at the fiber end was investigated. When excited by laser radiation (λ = 1.064 µm), coating of polystyrene spheres created in the liquid a laser thermal microstructure with a characteristic size of fractions of ~λ and a maximum temperature up to 10−2 degree at an energy in a short laser pulse of ~0.005 J. This short-lived thermal microstructure generated sound pulses in the liquid in the approximately 0.2–4 MHz range. The results of the experimental study of this effect are reported. The proposed laser radiation converter with colloidal coating of the optical fiber distal tip by a single layer of transparent spheres can be used for the development of new laser microtools for studying, processing of various objects in microsurgery, microstructuring of the surface, spot cleaning and restoration of objects of art and history. View Full-Text
Keywords: 2D colloidal coating; light fiber; laser radiation converter; polystyrene spheres; optoacoustics; generation of high frequency ultrasound 2D colloidal coating; light fiber; laser radiation converter; polystyrene spheres; optoacoustics; generation of high frequency ultrasound
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Bredikhin, V.I.; Kazakov, V.V. The Excitation of Ultrasound by Laser Radiation in Water Using an Optical Fiber Laser Converter with a 2D Colloidal Crystalline Coating. Coatings 2019, 9, 857.

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