Laser applications and other topics in quantum electronics : Photoacoustic methane gas analyser based on a 3.3-μm optical parametric oscillator. (30th November 2020)

• Record Type: Journal Article
• Authors: Sherstov, I V; Kolker, D B
• Is Part Of: Quantum electronics. Volume 50:Number 11(2020)
• Page Start: 1063
• Page End: 1067
• Publication Date: 2020-11-30
• Subjects: Quantum electronics -- Periodicals; 537.5
• DOI: 10.1070/QEL17316
• Languages: English
• ISSNs: 1063-7818

Abstract

Abstract: We demonstrate a bench-scale prototype of a photoacoustic (PA) methane gas analyser that takes advantage of an optical parametric oscillator (OPO) based on a fan-out MgO : PPLN structure and resonant differential PA detector. The OPO emits in a repetitively pulsed mode (≈1750 Hz) at an idler wavelength of ≈3.3 μm with an average power of ≈40 – 50 mW. Using the prototype laser PA gas analyser, we experimentally demonstrate the feasibility of measuring the background methane concentration in air (≈2 – 3 ppm of CH4 ). The threshold sensitivity of the PA gas analyser (1σ) is determined to be ≈49 ppb of CH4 .