Noise reduction in resonator-based ultrasound sensors by using a CW laser and phase detection

Lucas Riobó, Yoav Hazan, Francisco Veiras, María Garea, Patricio Sorichetti, Amir Rosenthal

פרסום מחקרי: פרסום בכתב עתמאמרביקורת עמיתים

תקציר

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. While intensity monitoring offers the advantage of simplicity, its sensitivity is often limited by the frequency noise of the CW laser. In this work, we develop an alternative CW technique that can significantly reduce 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.

שפה מקוריתאנגלית
עמודים (מ-עד)2677-2680
מספר עמודים4
כתב עתOptics Letters
כרך44
מספר גיליון11
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - 1 יוני 2019

ASJC Scopus subject areas

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