Compact Powell-Lens-Based Low-Coherence Correlation Interrogation System for Fiber-Optic Fabry-Perot Sensors

Ma, Zhibo; Guo, Tongxin; Zhang, Tianyang; Wang, Wei; Chen, Haibin; Zhang, Xiongxing; Yuan, Weizheng

doi:10.1109/jphot.2019.2920432

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Beam Shaping For Strip Laser Spot1

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2020

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“…The curvature radius of the cylindrical surface thus decreases in the center and increases smoothly towards both ends. As described in the previous papers [31], the cylindrical surface can be fitted to a base curve by the following Equation:…”

Section: Beam Shaping For Strip Laser Spotmentioning

confidence: 99%

Quartz Enhanced Photoacoustic Detection Based on an Elliptical Laser Beam

Shang

2020

Applied Sciences

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A quartz enhanced photoacoustic spectroscopy (QEPAS) sensor system based on an elliptical laser beam for trace gas detection was demonstrated. A Powell lens was exploited to shape the circular laser beam into an elliptical laser beam for the full utilization of the quartz tuning fork (QTF) prong spacing. Based on the finite element modeling (FEM) simulation software COMSOL, the distribution of acoustic pressure on QTF prongs with different beam shapes was simulated theoretically. The experimental results showed that the QEPAS signal based on the elliptical laser beam had a 1.4-fold improvement compared with the circular laser beam, resulting in a minimum detection limit of 418.6 ppmv and the normalized noise equivalent absorption (NNEA) of 1.51 × 10 −6 cm −1 W/ √Hz at atmospheric pressure.

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Section: Beam Shaping For Strip Laser Spotmentioning

confidence: 99%