Journal
OPTICS EXPRESS
Volume 26, Issue 22, Pages 28861-28871Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.028861
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Funding
- National Science Centre, Poland (NCN) [2014/14/M/ST7/00866]
- EM Field Theory, Electronic Circuits and Optoelectronics, Wroclaw University of Science and Technology [0401/0137/17]
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A novel configuration of a photothermal gas sensor is demonstrated. Photothermal-induced gas refractive index (RI) modulation is probed by a simple, mode-locked (ML) ring cavity fiber laser, operating in the 1.55 mu m wavelength region. The measured gas sample is placed in an open-path section of the ML laser and the RI variations directly translate to its optical path-length change, which is easily detectable as pulse repetition frequency deviations. Wavelength modulation spectroscopy (WMS) technique was used along with a custom-built FM demodulator simplifying the signal retrieval and acquisition. Normalized noise equivalent coefficient calculated for the sensor was 1 x 10(-5)cm(-1 )W Hz(-1/2). (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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