Random laser action under picosecond laser pumping
| Autor: | Seyedeh Mehri Hamidi, R. A. Ejbarah, J. M. Jassim |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Active laser medium
Random laser Materials science Scattering Mean free path 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials 010309 optics Full width at half maximum chemistry.chemical_compound chemistry 0103 physical sciences Rhodamine B Laser power scaling Electrical and Electronic Engineering Atomic physics 0210 nano-technology Lasing threshold |
| Zdroj: | Optical and Quantum Electronics. 52 |
| ISSN: | 1572-817X 0306-8919 |
| Popis: | This study was aimed to investigate the effect of scattering mean free path of different concentrations of silver nanoparticles in Rhodamine B (RhB) solution. To get the random lasing, the samples were exposed to Picosecond laser. Our results show a gradual increase in the random lasing emission by increase in the concentrations and thus scattering mean free path until the threshold amount. The emission intensity was enhanced by enhancing the laser power due to an increase in scattering, which cannot make a close loop path in the gain medium to reach the coherence random lasing. Our results showed efficient emission intensity due to the absorption of Rhodamine B with Ag NPs in the pumping wavelength where it has been observed that the lasing threshold is reduced from 0.628 A (without scatterer) to 0.62 A at $$9.2*10^{17}\, \hbox{cm}^{ - 3}$$ Likewise, the lowest FWHM (full width at half maximum) for this concentration was 34 nm, while without concentration it was 37 nm, but the clear and important difference is that the first occurred at 72 A, while the second state at 80 A. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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