Random laser-based noninvasive sensor for direct measurements of scattering samples

Federico Tommasi; Lorenzo Fini; Fabrizio Martelli; Stefano Cavalieri

doi:10.1117/12.2650333

7 March 2023 Random laser-based noninvasive sensor for direct measurements of scattering samples

Federico Tommasi, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalieri

Proceedings Volume 12376, Optical Tomography and Spectroscopy of Tissue XV; 123760O (2023) https://doi.org/10.1117/12.2650333
Event: SPIE BiOS, 2023, San Francisco, California, United States

Conference Poster

Abstract

The invention of the random laser has opened a new frontier in optics, providing also the opportunity to explore new possibilities in the field of sensing. The research in optical sensors has indeed been largely encouraged by the demand for low-cost and non-invasive new detection strategies. The main advantage in exploiting the physical principle of the random laser in optical sensors is due to the presence of the stimulated emission mechanism, which allows amplification and spectral modification of the signal. We present here a step forward in the exploitation of this optical sensor device by an improved revisitation of a previous experimental setup, both in the instrumentation and in the measurement method, to mitigate the instability of the results due to shot-to-shot pump energy fluctuations. The novelties introduced, the use of optical fibers, a reference sensor, and a peristaltic pump have shown to eliminate optical beam alignment issues and the problems linked to variation in pump energy. The implemented sensor allows easy and rapid change of the sensed medium. These results pave the way for a portable device to directly measure the scattering of liquid samples, without resorting to complicated numerical or analytic inversion procedures of the measured data, provided that a suitable calibration of the system is performed.

Citation Download Citation

Federico Tommasi, Lorenzo Fini, Fabrizio Martelli, and Stefano Cavalieri "Random laser-based noninvasive sensor for direct measurements of scattering samples", Proc. SPIE 12376, Optical Tomography and Spectroscopy of Tissue XV, 123760O (7 March 2023); https://doi.org/10.1117/12.2650333

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