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Proceedings Paper

Microresonators for compact optical sensors (uRCOS) for gas detection
Author(s): Payal Singh; Logan Echeveria; Sara Harrison; Catherine Reinhardt; Victor Khitrov; Ken Heinz; Allan Chang; Gualtiero Nunzi-Conti; Daniele Farnesi; Tiziana Bond
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Paper Abstract

This paper discusses ongoing research at Lawrence Livermore National Laboratory (LLNL) that investigates the effectiveness of spherical micro-resonators, coupled to a symmetrically tapered optical fiber, as a gas sensor. We will discuss silica-based microspheres and optimized tapered fiber coupling systems to detect greenhouse gases, i.e. CO2 in this context. The coupling setup is designed to be portable and amenable to different controlled environments, from constrained and controlled geometries to open and flexible enclosures. 3D-printed spherical resonator and tapered-fiber holders were made to satisfy different requirements. We produced microspheres for absorption spectroscopy of targeted gas and fabricated tapers by HF etching, using an HF-resistant fixture for safer handling and reduced waste. Detection within loose enclosures was performed as a preliminary study, where we observed spectral shift and broadening in the cavity resonances induced by the gaseous environments. Optically coupled vacuum-tight vessels have been designed and built to understand environmental effects.

Paper Details

Date Published: 2 March 2020
PDF: 8 pages
Proc. SPIE 11266, Laser Resonators, Microresonators, and Beam Control XXII, 112661F (2 March 2020); doi: 10.1117/12.2543815
Show Author Affiliations
Payal Singh, Lawrence Livermore National Lab. (United States)
Univ. of California, San Diego (United States)
Logan Echeveria, Lawrence Livermore National Lab. (United States)
Univ. of California, Davis (United States)
Sara Harrison, Lawrence Livermore National Lab. (United States)
Catherine Reinhardt, Lawrence Livermore National Lab. (United States)
Victor Khitrov, Lawrence Livermore National Lab. (United States)
Ken Heinz, Lawrence Livermore National Lab. (United States)
Allan Chang, Lawrence Livermore National Lab. (United States)
Gualtiero Nunzi-Conti, IFAC-CNR, Institute of Applied Physics “N. Carrara” (Italy)
Daniele Farnesi, IFAC-CNR, Institute of Applied Physics “N. Carrara” (Italy)
Tiziana Bond, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 11266:
Laser Resonators, Microresonators, and Beam Control XXII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko; Andrea M. Armani, Editor(s)

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