In this work, the use of binary amplitude holography is investigated as a mechanism to focus broadband acoustic pulses generated by high peak-power pulsed lasers. Two algorithms are described for the calculation of the binary holograms; one using ray-tracing, and one using an optimization based on direct binary search. It is shown using numerical simulations that when a binary amplitude hologram is excited by a train of laser pulses at its design frequency, the acoustic field can be focused at a pre-determined distribution of points, including single and multiple focal points, and line and square foci. The numerical results are validated by acoustic field measurements from binary amplitude holograms, excited by a high peak-power laser.

Department of Medical Physics and Biomedical Engineering University College London 2 10 Stephenson Way NW1 2HE London United Kingdom

Faculty of Information Technology Brno University of Technology Bozetechova 2 612 66 Brno Czech Republic

Citace poskytuje Crossref.org