Direct measurements of diffusive samples by random lasing

Federico Tommasi; Lorenzo Fini; Fabrizio Martelli; Stefano Cavalieri

doi:10.1117/12.2670943

11 August 2023 Direct measurements of diffusive samples by random lasing

Federico Tommasi, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalieri

Proceedings Volume 12629, Emerging Technologies for Cell and Tissue Characterization II; 126290G (2023) https://doi.org/10.1117/12.2670943
Event: European Conferences on Biomedical Optics, 2023, Munich, Germany

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. Random lasing have been proposed as promising opportunity to extend the potentiality given by optical sensing strategies, in particular in the field of the measurement of diffusive properties. Compared to the other used strategies, random laser-base systems has the advantage to show amplification of the signal by stimulated emission, as well as spectral modification. In particular, a non-invasive type of random laser sensor, that exploits a transparent physical separation between the gain material and the diffusive sample, has been reported. Here we present an improvement of the experimental setup used for such a kind of sensor. By the use of a optical fibers system and a couple of twin sensors, we report an enhancement of the accuracy, stability, reproducibility, as well an measurement method easy to perform, without resorting to complicated numerical or analytic inversion procedures. Since the possibility to perform local direct measurement on diffusive samples, such a “active” method can be a promising strategy in the field of biomedical optics and for non-invasive diagnostic purposes.

Citation Download Citation

Federico Tommasi, Lorenzo Fini, Fabrizio Martelli, and Stefano Cavalieri "Direct measurements of diffusive samples by random lasing", Proc. SPIE 12629, Emerging Technologies for Cell and Tissue Characterization II, 126290G (11 August 2023); https://doi.org/10.1117/12.2670943

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