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Title:Photothermal lens technique: a comparison between conventional and self-mixing schemes
Authors:Cabrera, Humberto (Author)
Ashraf, Imrana (Author)
Matroodi, Fatima (Author)
Ramírez-Miquet, Evelio E. (Author)
Akbar, Jehan (Author)
Suárez-Vargas, Jose Juan (Author)
Barrera Ramírez, John Fredy (Author)
Korte, Dorota (Author)
Budasheva, Hanna (Author)
Niemela, Joseph J. (Author)
et al.
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:This work focuses on assessing the analytical capabilities of a new photothermal lens method based on the self-mixing effect to reliably measure metallic traces in water-ethanol solutions. We compare it with the conventional thermal lens scheme, considering the low detection limit and versatility. A theoretical model is presented to describe the laser power variations as a function of the photothermal parameters of the analyzed sample. The experimental results demonstrate that the laser intensity variations, induced by the external optical feedback, are governed by the photothermal lens effect. Measurements of Fe(II)-1,10-phenanthroline in water–ethanol solutions show a favourable correspondence and agreement with the theory. The low detection limits obtained by the two analytic techniques also agree very well. Nevertheless, our instrument presents advantages regarding compactness and simplicity, suggesting that this platform could be potentially useful as a robust analytical tool for metallic trace detection. In addition, calibration of the method is performed by measuring the so-called self-mixing constant.
Keywords:thermal lens, photothermal spectroscopy, self-mixing effect, trace detection
Year of publishing:2019
Number of pages:055703-055703
Numbering:5, 29
COBISS_ID:5366267 Link is opened in a new window
DOI:10.1088/1555-6611/ab0a66 Link is opened in a new window
License:CC BY-NC-ND 4.0
This work is available under this license: Creative Commons Attribution Non-Commercial No Derivatives 4.0 International
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Record is a part of a journal

Title:Laser Physics
Shortened title:Laser Phys.
Year of publishing:2019