Chinese Optics Letters, Vol. 18, Issue 11, 111402 (2020)
Design and analysis of a range-extended acidity detector based on a Nile red laser with tandem cuvette system
Yuwei Fang1, Junjie Cheng2, Shengbo Wang1, Chun Gu1, Gang Zou2, Hai Ming1, and Lixin Xu1,*
- 1Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China
- 2CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China, Hefei 230026, China
A range-extended acidity detector based on Nile red was designed and analyzed in this work. In light of the good lasing property and solvatochromism characteristic of Nile red/ethanol solution, we have obtained laser spectra of sulfuric acid in different concentrations doped in this substrate. Moreover, to expand the acidity detection range, we proposed a tandem cuvette system containing rhodamine 6G/ethanol and Nile red/ethanol. Consequently, the detection range could be enlarged from 26 nm to 40 nm, by changing not only the wavelength peak but also by the intensity ratio of dual-wavelength laser output. In addition, by changing the detection and substrate materials, the whole detection range could be expanded, and therefore a wide range of applications in polarity and acidity detection could be implemented via this method.
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