Open AccessSimultaneous multi-channel ultrasound detection via phase modulated pulse interferometry
Author(s) -
Yoav Hazan,
Amir Rosenthal
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.028844
Subject(s) - optics , interferometry , resonator , detector , photodetector , interrogation , phase (matter) , phase modulation , materials science , sensitivity (control systems) , modulation (music) , physics , electronic engineering , phase noise , acoustics , archaeology , quantum mechanics , history , engineering
In optical detection of ultrasound, resonators with high Q-factors are often used to maximize sensitivity. However, in order to perform parallel interrogation, conventional interferometric techniques require an overlap between the spectra of all the resonators, which is difficult to achieve with high Q-factor resonators. In this paper, a new method is developed for parallel interrogation of optical resonators with non-overlapping spectra. The method is based on a phase-modulation scheme for pulse interferometry (PM-PI) and requires only a single photodetector and sampling channel per ultrasound detector. Using PM-PI, parallel ultrasound detection is demonstrated with four high Q-factor resonators.