Microresonators for compact optical sensors (uRCOS) for gas detection

Payal Singh; Logan Echeveria; Sara Harrison; Catherine Reinhardt; Victor Khitrov; Ken Heinz; Allan Chang; Gualtiero Nunzi-Conti; Daniele Farnesi; Tiziana Bond

doi:10.1117/12.2543815

2 March 2020 Microresonators for compact optical sensors (μRCOS) for gas detection

Payal Singh, Logan Echeveria, Sara Harrison, Catherine Reinhardt, Victor Khitrov, Ken Heinz, Allan Chang, Gualtiero Nunzi-Conti, Daniele Farnesi, Tiziana Bond

Author Affiliations +

Proceedings Volume 11266, Laser Resonators, Microresonators, and Beam Control XXII; 112661F (2020) https://doi.org/10.1117/12.2543815
Event: SPIE LASE, 2020, San Francisco, California, United States

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.

Citation Download Citation

Payal Singh, Logan Echeveria, Sara Harrison, Catherine Reinhardt, Victor Khitrov, Ken Heinz, Allan Chang, Gualtiero Nunzi-Conti, Daniele Farnesi, and Tiziana Bond "Microresonators for compact optical sensors (μRCOS) for gas detection", Proc. SPIE 11266, Laser Resonators, Microresonators, and Beam Control XXII, 112661F (2 March 2020); https://doi.org/10.1117/12.2543815

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