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A new way of controlling NesCOPOs (Nested Cavity doubly resonant OPO) for faster and more efficient high resolution spectrum measurement
Author(s): Johann Georges des Aulnois; Benjamin Szymanski; Axel Grimieau; Léo Sillard
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Paper Abstract

Optical Parametric Oscillator (OPO) is a well-known solution when wide tunability in the mid-infrared is needed. A specific design called NesCOPO (Nested Cavity doubly resonant OPO) is currently integrated in the X-FLR8 portable gas analyzer from Blue Industry and Science. Thanks to its low threshold this OPO can be pumped by a micro-chip nanosecond YAG (4 kHz repetition rate and a 30 GHz bandwidth). To achieve very high resolution spectra (10 pm of resolution or better), the emitted wavelength has to be finely controlled. Commercial Wavemeter do not meet price and compactness required in the context of an affordable and portable gas analyzer. To overcome this issue, Blue first integrated an active wavelength controller using multiple tunable Fabry-Perot (FP) interferometers. The required resolution was achieved at a 10 Hz measurement rate. We now present an enhanced Wavemeter architecture, based on fixed FP etalons, that is 100 times faster and 2 times smaller. We avoid having FP ‘blind zones’ thanks to one source characteristic: the knowledge of the FSR (Free Spectral Range) of the OPO source and thus, the fact that only discrete wavelengths can be emitted. First results are displayed showing faster measurement for spectroscopic application, and potential future improvement of the device are discussed.

Paper Details

Date Published: 14 May 2018
PDF: 11 pages
Proc. SPIE 10657, Next-Generation Spectroscopic Technologies XI, 1065708 (14 May 2018); doi: 10.1117/12.2299286
Show Author Affiliations
Johann Georges des Aulnois, Blue Industry and Science (France)
Benjamin Szymanski, Blue Industry and Science (France)
Axel Grimieau, Blue Industry and Science (France)
Léo Sillard, Blue Industry and Science (France)


Published in SPIE Proceedings Vol. 10657:
Next-Generation Spectroscopic Technologies XI
Mark A. Druy; Richard A. Crocombe; Steven M. Barnett; Luisa T.M. Profeta; Abul K. Azad, Editor(s)

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