Control of Bubble Formation at the Optical Fiber Tip by Analyzing Ultrasound Acoustic Waves
- 1 Institute of Applied Physics of the Russian Academy of Sciences, Russia
- 2 Institute of Photon Technologies of Federal Scientific Research Centre, Russia
Copyright: © 2020 Viacheslav Viacheslavovich Kazakov, Vladimir Isaakovich Yusupov, Viktor Nikolaevich Bagratashvili, Anton Ivanovich Pavlikov and Vladislav Antonievich Kamensky. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The problems of controlling the processes of generation of acoustic waves and microbubbles at the optical fiber tip of moderate-power surgical lasers with wavelengths of 1.9 µm and 0.97 µm using active and passive acoustic methods are considered. It is shown that microbubbles of various sizes can be detected with an ultrasound method, in which the interaction area is recorded simultaneously at two frequencies. By measuring noise with a receiving transducer of an ultrasonic locator, we determine the frequency range of the acoustic signals occurring when large diameter bubbles, including gas-vapor bubbles, collapse. Model experiments are conducted to detect noise and bubbles in water and in a water-saturated 1.5% agarose phantom at various laser powers with an optical fiber tip having a strongly absorbing coating.
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- Laser Heating
- Dual-Frequency Ultrasound
- Acoustic Noise
- Bubble Detection
- Optical Fiber with Strongly Absorbing Coating