Rapid spectroscopic gas sensing using optical linear chirp chain

Spectroscopic gas analysis for monitoring transient events in fast processes requires high spectrum acquisition rate with low uncertainty; however, so far high-speed spectroscopic gas detection with sufficient spectral resolution and spectral span is still challenging. Here, we propose an innovative...

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Bibliographic Details
Published in:Optics express 2019-04, Vol.27 (9), p.13160-13171
Main Authors: Lou, Xiutao, Yuan, Ziyue, Dong, Yongkang
Format: Article
Language:English
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Summary:Spectroscopic gas analysis for monitoring transient events in fast processes requires high spectrum acquisition rate with low uncertainty; however, so far high-speed spectroscopic gas detection with sufficient spectral resolution and spectral span is still challenging. Here, we propose an innovative method based on optical linear chirp chain (OLCC) for rapid acquisition of high-resolution gas spectra with a rate up to the order of MHz with 100% duty cycle, spectral resolution at 10-MHz level and spectral span > 20 GHz. The OLCC is generated by high-speed optical modulation driven by a digital arbitrary waveform generator in combination with a four-wave-mixing process, exhibiting a highly linear frequency chirp (linearity error of ~10 ) and low level of residual amplitude modulation (
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.013160