Cherkashin, MN;
Keenlyside, B;
Allen, TJ;
Beard, PC;
Guggenheim, JA;
(2023)
Photoacoustic wavefront shaping with a long coherence length laser.
In:
Progress in Biomedical Optics and Imaging - Proceedings of SPIE.
SPIE: San Francisco, CA, US.
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Abstract
Photoacoustic (PA) wavefront shaping (WS; PAWS) could allow focusing light deep in biological tissue. This could enable increasing the penetration depth of biomedical optical techniques including PA imaging. However, focussing at depth requires a light source of long coherence length (CL), presenting a challenge because the CLs of typical PA excitation lasers are short. To address this challenge, we developed a PAWS system based on an externally modulated external cavity laser with a long CL. The system was demonstrated by focussing light through rigid scattering media using both PAWS and optical WS. PAWS enabled focussing through diffusers with 8 × enhancements, while all-optical WS enabled focussing through various scattering media including a 5.8 mm thick tissue phantom. By enabling PAWS with increased coherence, the system could facilitate exploring the practical depth limits of PAWS, paving the way to focussing light deep in tissue.
Type: | Proceedings paper |
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Title: | Photoacoustic wavefront shaping with a long coherence length laser |
Event: | SPIE BIOS |
Dates: | 28 Jan 2023 - 3 Feb 2023 |
ISBN-13: | 9781510658639 |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1117/12.2652242 |
Publisher version: | https://doi.org/10.1117/12.2652242 |
Language: | English |
Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | Photoacoustic, imaging, wavefront shaping |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
URI: | https://discovery.ucl.ac.uk/id/eprint/10170765 |
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