Ultrasound pulse generation through continuous-wave laser excited thermo-cavitation for all-optical ultrasound imaging
APL Photonics, ISSN: 2378-0967, Vol: 8, Issue: 4
2023
- 5Citations
- 12Captures
- 1Mentions
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Most Recent News
Researchers from University of Jinan Describe Findings in Photonics (Ultrasound Pulse Generation Through Continuous-wave Laser Excited Thermo-cavitation for All-optical Ultrasound Imaging)
2023 MAY 15 (NewsRx) -- By a News Reporter-Staff News Editor at Medical Imaging Daily News -- Current study results on Science - Photonics have
Article Description
The optical generation of pulsed ultrasound is attractive to nondestructive testing and biological imaging, especially for those involving narrow operation space or strong electro-magnetic interference. However, conventional techniques based on the photoacoustic effect inevitably required an expensive high-energy short pulsed laser and dedicated preparation of the optically absorptive composite film. Here, a fiber-optic ultrasound pulse transmitter based on continuous-wave (CW) laser triggered thermo-cavitation was demonstrated. The fiber-delivered CW laser light heated the highly-absorptive copper nitrate solution and generated explosive bubbles, which emitted strong ultrasound waves. Omnidirectional ultrasound pulses with an amplitude up to 0.3 MPa and a repetition rate of 5 kHz in the frequency range of 5-12 MHz were obtained by using a 50 mW optical heating power at a wavelength of 980 nm. The fiber-tip ultrasound transmitter was integrated with a polymer-cavity-based fiber ultrasound detector to construct an all-fiber ultrasound endoscopic imaging probe. Without the need for a wavelength-tunable laser, the ultrasound detector was interrogated by CW laser light with a fixed wavelength, coupled with feedback-controlled heating of the cavity to stabilize its spectral fringe. The CW laser-driven fiber ultrasound transmitter, in combination with the photothermally stabilized fiber ultrasound detector, opens new routes for a number of ultrasound-related industrial and biomedical applications.
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