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20 April 2020 24-fold noise reduction in resonator-based optical detection of ultrasound via phase monitoring (Conference Presentation)
Lucas Riobó, Yoav Hazan, Amir Rosenthal
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Proceedings Volume 11240, Photons Plus Ultrasound: Imaging and Sensing 2020; 112400T (2020) https://doi.org/10.1117/12.2542010
Event: SPIE BiOS, 2020, San Francisco, California, United States
Abstract
The detection of ultrasound via optical resonators is conventionally performed by tuning a continuous-wave (CW) laser to the linear slope of the resonance and monitoring the intensity modulation at the resonator output. In this work, we develop an alternative CW technique that can significantly reduce the measurement noise by monitoring variations in the phase, rather than intensity, at the resonator output. In our current implementation, which is based on a balanced Mach-Zehnder interferometer for phase detection, we demonstrate a 24-fold increase in the signal-to-noise ratio of the detected ultrasound signal over the conventional, intensity-monitoring approach.
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Lucas Riobó, Yoav Hazan, and Amir Rosenthal "24-fold noise reduction in resonator-based optical detection of ultrasound via phase monitoring (Conference Presentation)", Proc. SPIE 11240, Photons Plus Ultrasound: Imaging and Sensing 2020, 112400T (20 April 2020); https://doi.org/10.1117/12.2542010
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KEYWORDS
Ultrasonography
Denoising
Continuous wave operation
Phase shift keying
Signal detection
Optical resonators
Resonators
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