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Proceedings Paper

Optical-frequency-comb based ultrasound sensor
Author(s): Takeo Minamikawa; Takashi Ogura; Takashi Masuoka; Eiji Hase; Yoshiaki Nakajima; Yoshihisa Yamaoka; Kaoru Minoshima; Takeshi Yasui
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Paper Abstract

Photo-acoustic imaging is a promising modality for deep tissue imaging with high spatial resolution in the field of biology and medicine. High penetration depth and spatial resolution of the photo-acoustic imaging is achieved by means of the advantages of optical and ultrasound imaging, i.e. tightly focused beam confines ultrasound-generated region within micrometer scale and the ultrasound can propagate through tissues without significant energy loss. To enhance the detection sensitivity and penetration depth of the photo-acoustic imaging, highly sensitive ultrasound detector is greatly desired. In this study, we proposed a novel ultrasound detector employing optical frequency comb (OFC) cavity. Ultrasound generated by the excitation of tightly focused laser beam onto a sample was sensed with a part of an OFC cavity, being encoded into OFC. The spectrally encoded OFC was converted to radio-frequency by the frequency link nature of OFC. The ultrasound-encoded radio-frequency can therefore be directly measured with a high-speed photodetector. We constructed an OFC cavity for ultrasound sensing with a ring-cavity erbium-doped fiber laser. We provided a proof-of-principle demonstration of the detection of ultrasound that was generated by a transducer operating at 10 MHz. Our proposed approach will serve as a unique and powerful tool for detecting ultrasounds for photo-acoustic imaging in the future.

Paper Details

Date Published: 3 March 2017
PDF: 6 pages
Proc. SPIE 10064, Photons Plus Ultrasound: Imaging and Sensing 2017, 100645C (3 March 2017); doi: 10.1117/12.2250792
Show Author Affiliations
Takeo Minamikawa, Tokushima Univ. (Japan)
Japan Science and Technology Agency (Japan)
Takashi Ogura, Tokushima Univ. (Japan)
Takashi Masuoka, Tokushima Univ. (Japan)
Eiji Hase, Tokushima Univ. (Japan)
Japan Science and Technology Agency (Japan)
Yoshiaki Nakajima, Japan Science and Technology Agency (Japan)
The Univ. of Electro-Communications (Japan)
Yoshihisa Yamaoka, Saga Univ. (Japan)
Kaoru Minoshima, Japan Science and Technology Agency (Japan)
The Univ. of Electro-Communications (Japan)
Takeshi Yasui, Tokushima Univ. (Japan)
Japan Science and Technology Agency (Japan)


Published in SPIE Proceedings Vol. 10064:
Photons Plus Ultrasound: Imaging and Sensing 2017
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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