Affiliation:
1. Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University , Guangzhou 511443, China
Abstract
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.
Funder
National Natural Science Foundation of China
Guangzhou Science and Technology Plan Project
Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program
Natural Science Foundation of Guangdong Province
Guangzhou Fundamental and Applied Fundamental Research Project
Science and Technology Innovation Strategy Special Fund of Guangdong Province
Innovation and Entrepreneurship Training Program for College Students
Subject
Computer Networks and Communications,Atomic and Molecular Physics, and Optics
Cited by
1 articles.
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1. Photoacoustic imaging plus X: a review;Journal of Biomedical Optics;2023-12-28