Effect of linewidth enhancement factor on displacement reconstruction and immediate estimation of feedback factor for weak feedback
| Autor: | Chol-Hyon Kim |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
business.industry Computation 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Displacement (vector) Electronic Optical and Magnetic Materials Metrology 010309 optics Vibration Laser linewidth Interferometry Optics Control theory 0103 physical sciences Range (statistics) Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology business Brownian motion |
| Zdroj: | Optics Communications. 461:125203 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2019.125203 |
| Popis: | Metrology based on self-mixing interferometry (SMI) covers a wide range of metrical application such as measurement of distance displacement, vibration, velocity, flow and size of Brownian particles. In general, two SMI parameters namely, optical feedback factor C and linewidth enhancement factor (LEF) α are significant in the above-mentioned measurements. Particularly, the joint estimation of C and α is the key to real-time displacement self-mixing (SM) sensor with sub-wavelength resolution. The application of the approach to the immediate estimation of C and α proposed by Kim et al. (2018) is limited to the moderate and strong feedback regime. The paper presents an approach to the immediate estimation of C for the weak feedback regime, to which the approach by Kim et al. (2018) is impossible to be applied, thus allowing the immediate joint estimation method to be applied to all the regimes. Because the proposed method is incomparably simpler than the previous ones and very efficient in hardware, it will be of great assistance to developing a low-cost real-time SM displacement sensor with sub-wavelength resolution in which complex computation such as optimization are impossible. In addition, the paper discusses the effect of C and α on the accuracy of displacement reconstruction. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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