Ultra-high sensitivity frequency-comb-referenced multi-parametric sensors based on 1-D photonic components

Year: 2008

Authors: Gagliardi G., Maddaloni P., Malara P., Salza M., Ferraro P., De Natale P.

Autors Affiliation: Istituto Nazionale di Ottica Applicata, Consiglio Nazionale Delle Ricerche Comprensorio A. Olivetti, Via Campi Flegrei 34, 80078 Pozzuoli (Napoli), Italy

Abstract: A novel generation of sensors of strain, temperature, absolute and relative molecular concentration is reported. Such devices, based on 1-D photonic structures, rely on ultrastable laser sources, referenced to a fiber-based optical frequency comb synthesizer (OFCS). In particular, recent advances in the realization of two complementary laser sensors are presented. One is a spectroscopic facility which exploits frequency mixing in a periodically-poled LiNbO3 crystal to generate highly coherent (a few hundred kHz linewidth) infrared radiation tunable in the 2.9-3.5 micron wavelength range. Such radiation can be coupled to high-finesse enhancement cavities to detect trace amounts of gases, including rare isotopes in natural abundance. The other system, making use of fiber Bragg grating components, provides strain and temperature sensing with extremely high sensitivities (about 100 fe, i.e. 10-13 ?L/L). Due to the remoteness guaranteed by the fiber coupling, these two systems can both be used in difficult environments and inserted in a multi-parametric network for real-time and continuous monitoring of large areas. Prospects for application in volcanic areas are also discussed.

Conference title:

KeyWords: Applications; Concentration (process); Continuous time systems; Fiber Bragg gratings; Fiber optic components; Inert gases; Infrared radiation; Optical frequency conversion; Powders; Real time systems; Semiconducting films; Semiconductor materials; Sensors; Continuous monitoring; Fiber couplings; Frequency mixing; High sensitivities; Laser sensors; Laser sources; Molecular concentrations; Natural abundances; OF sensors; Optical frequency combs; Parametric networks; Photonic components; Photonic structures; Strain and temperature sensing; Trace amounts; Volcanic areas; Wavelength ranges; Fibers
DOI: 10.1117/12.795015

Citations: 1
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