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

G. Gagliardi; P. Maddaloni; P. Malara; M. Salza; P. Ferraro; P. De Natale

doi:10.1117/12.795015

27 August 2008 Ultra-high sensitivity frequency-comb-referenced multi-parametric sensors based on 1-D photonic components

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

Author Affiliations +

Proceedings Volume 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II; 70560I (2008) https://doi.org/10.1117/12.795015
Event: Photonic Devices + Applications, 2008, San Diego, California, United States

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 fε, i.e. 10^-13 ΔL/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.

Citation Download Citation

G. Gagliardi, P. Maddaloni, P. Malara, M. Salza, P. Ferraro, and P. De Natale "Ultra-high sensitivity frequency-comb-referenced multi-parametric sensors based on 1-D photonic components", Proc. SPIE 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II, 70560I (27 August 2008); https://doi.org/10.1117/12.795015

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