14 December 2016 Acoustic emission and magnification of atomic lines intensity originated by laser breakdown of salt water
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Proceedings Volume 10176, Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics; 101761F (2016) https://doi.org/10.1117/12.2268161
Event: Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics, 2016, Khabarovsk, Russia
Abstract
Research studies have been carried out the acoustic effects accompanying optical breakdown in water generated by focused laser and ultrasound radiation. Experiments were performed by using 532 nm pulses from a Brilliant B Nd:YAG laser. Acoustic radiation was produced by acoustic focusing systems in the form of hemispheres and rings at frequencies 10.7 kHz and 60 kHz. The experimental results show the sharply strengthened effects of acoustic emission from a breakdown zone by the joint influence of laser and ultrasonic irradiation. Various breakdown thresholds and character of acoustic emission in fresh and sea water are observed. The experimental result established that acoustic emission from optical breakdown of sea water in the presence and absence of ultrasound exceeds acoustic emission for the same experimental conditions in fresh water. Atomic lines of some chemical elements like sodium and magnesium were investigated for laser breakdown of water with the ultrasound field. The effect of magnification of these atomic lines resolution for salt water in ultrasound field was obtained. It is shown that the method of registration of acoustic emission from a breakdown zone allows to investigate thresholds and dynamics of laser breakdown which will be in accord with high-speed optical methods. The study revealed important practical applications of acoustic emission for breakdown and diagnostics of cavitation in opaque environments.
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A. V. Bulanov, A. V. Bulanov, I. G. Nagorny, I. G. Nagorny, } "Acoustic emission and magnification of atomic lines intensity originated by laser breakdown of salt water", Proc. SPIE 10176, Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics, 101761F (14 December 2016); doi: 10.1117/12.2268161; https://doi.org/10.1117/12.2268161
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