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Proceedings Paper

High energy laser pulse coupling in a multimode fiber for photoacoustic tomography
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Paper Abstract

In traditional photoacoustic tomography, external illumination is used to excite acoustic waves. However, with the assistance of fibre-transmitted light, multidirectional illumination or internal illumination can be achieved which can obtain a better image at a deeper depth. Laser pulses delivered by fibre are energy-limited by the fibre core size and damage threshold. To increase the amplitude of photoacoustic waves and their penetration, it is necessary to improve the fibre coupling energy and efficiency. To improve the coupling performance of single fibres, we use a cylindrical lens array to homogenize the incident beam before a coupling lens. Simulation in Zemax shows that this approach flattens the beam profile on the front surface of the fibre, decreasing the risk of fibre damage. Experimental results with fibre core diameters of 1mm and 1.5mm show that both types of fibre can output more than 50mJ energy per pulse at 700nm wavelength. The coupling efficiency is measured to be above 70% and even reaches 90% as the wavelength changes from 675nm to 900nm. This improvement of coupling energy in single fibres will benefit photoacoustic tomography applications using internal illumination.

Paper Details

Date Published: 15 March 2016
PDF: 6 pages
Proc. SPIE 9708, Photons Plus Ultrasound: Imaging and Sensing 2016, 97084H (15 March 2016); doi: 10.1117/12.2213080
Show Author Affiliations
Min Ai, The Univ. of British Columbia (Canada)
Weihang Shu, The Univ. of British Columbia (Canada)
Tim Salcudean, The Univ. of British Columbia (Canada)
Robert Rohling, The Univ. of British Columbia (Canada)
Purang Abolmaesumi, The Univ. of British Columbia (Canada)
Shuo Tang, The Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 9708:
Photons Plus Ultrasound: Imaging and Sensing 2016
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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