DESIGN OF OPTICAL COUPLING FOR PHOTOACOUSTIC IMAGING

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https://hdl.handle.net/2142/124915

Title: DESIGN OF OPTICAL COUPLING FOR PHOTOACOUSTIC IMAGING
Author(s): Sun , Haofeng
Issue Date: 2021-05-01
Keyword(s): Photoacoustic Imaging, Optics, Zemax
Abstract: Biomedical imaging is widely used in clinical practices to produce images of the interior of a body. Photoacoustic imaging is one of these techniques that has the advantages of producing high-resolution images with little harm to the body. This thesis presents the design choice and process of an optical coupler for photoacoustic imaging. The goal is to convert the diverging Gaussian beam coming from the optical fiber bundle to a uniform-intensity line-shape beam, by using the Powell lens, in order to uniformly illuminate the tissue. A small size diverging beam, instead of a collimated beam, is used as the input to the Powell lens in order to prevent the potential damage to the Powell lens caused by the high-power laser focal spot. We confirm that our optical system works properly by the Zemax simulation given the same setup as the equipment we have in the laboratory, and it successfully generates a 3 cm line beam that is mostly uniform through the experiment in the lab. For future work, this optical coupler can be made more compact and can be integrated with a transducer as a handheld probe to experiment with mice.
Type of Resource: text
Language: eng

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