title: A new class of optical sensors: a random laser based device.
abstract: In a random laser the optical feedback is provided by scattering rather than by an optical cavity. Then, since its emission characteristics are very susceptible to the scattering details, it is a natural candidate for making active sensors to use as a diagnostic tool for disordered media like biological samples. However, the methods reported up to now, requiring the injection of toxic substances in the sample, have the drawback of altering the physical-chemical composition of the medium and are not suitable for in-vivo measurements. Here we present a random laser based sensor that overcomes these problems by keeping gain and diffusion separated. We provide an experimental characterisation of the sensor by using a reference diffusive liquid phantom and we show that, compared to a passive method, this sensor takes advantage of the gain and spectral properties of the random laser principle.
authors.affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, Via G. Sansone 1 I-50019 Sesto Fiorentino, Italy.
authors.forename: Emilio
authors.initials: E
authors.lastname: Ignesti
authors.affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, Via G. Sansone 1 I-50019 Sesto Fiorentino, Italy.
authors.forename: Federico
authors.initials: F
authors.lastname: Tommasi
authors.affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, Via G. Sansone 1 I-50019 Sesto Fiorentino, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Fini
authors.affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, Via G. Sansone 1 I-50019 Sesto Fiorentino, Italy.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Martelli
authors.affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, Via G. Sansone 1 I-50019 Sesto Fiorentino, Italy.
authors.forename: Niccolò
authors.initials: N
authors.lastname: Azzali
authors.affiliation: Dipartimento di Fisica e Astronomia, Università di Firenze, Via G. Sansone 1 I-50019 Sesto Fiorentino, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Cavalieri