Model for bichromatic laser emission from a laser dye with nanoparticle scatterers

Vaveliuk, Pablo; Silva, A. M. de Brito; Oliveira, Paulo César de

doi:10.1103/physreva.68.013805

Cited by 41 publications

(48 citation statements)

References 26 publications

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“…What is interesting, the thermalization process was observed by us only for non-aggregated nanopowders and disappeared when nanocrystals have been embedded in glass matrix [12,13]. Ceramic and powdered materials doped with rare-earths ions, exhibiting phonon confined-effect, are proposed by many authors as random laser systems and new high-efficient phosphors [14][15][16][17][18]. It is well known, that understanding mechanisms of the dissipation of thermal energy in nanocrystals and investigation of their influence on the radiative processes is essential for design of such luminescent nanomaterials.…”

Section: Introductionmentioning

confidence: 98%

The crystal-size and power dependence of luminescence properties of Nd³⁺:LaAlO 3 nanopowders

et al. 2004

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The luminescence properties of the Nd 3+ :LaAlO 3 nanocrystalline powders characterized by different sizes of grains in the range of 25-50 nm were investigated. The effect of the nanocrystallites sizes on the luminescence behavior of Nd 3+ was observed. In particular decreasing the grain sizes was found to increase emission from the thermally populated 4 F 5/2 state. It's intensity increased with the increase of excitation power density. The spectroscopic parameters of Nd 3+ doped LaAlO 3 nanocrystallites were determined from luminescence spectra by using the Judd-Ofelt method and compared to those obtained for a single crystal of Nd 3+ :LaAlO 3 .

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Section: Introductionmentioning

confidence: 98%

The crystal-size and power dependence of luminescence properties of Nd³⁺:LaAlO 3 nanopowders

et al. 2004

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“…As known from the experiments, 11,12 we know that the spectral property is hardly affected by the pump energy. If the pump energy is at low level, no matter what the dye concentration value is, the spectra are broadened.…”

Section: Resultsmentioning

confidence: 98%

“…Although the model has some limitations to explain some related experiments, the spectral property and temporal property of the light-waves in random media can be studied accurately. According to previous experimental results, 11 the lifetimes of two divided lasing systems (τ 52 and τ 54 ) are proportional to the concentration of monomers and dimers, respectively. Apart from other external factors, the ratio of the concentration of a monomer to that of a dimer can be described by the parameter C = τ 52 /τ 54 .…”

Section: Theoretical Modelmentioning

confidence: 93%

“…Based on Vaveliuk's laser model, 11 we suppose that there exist two relative substances in the random media, and the energy exchange between them including absorption effect and nonradiative transition process from the monomers to dimers. We made some changes to simplify the numerical model and the corresponding rate equations.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…However, the arguments of both models could not be sufficient to explain bichromatic emission solely. When Vaveliuk brought forward the "monomer-dimer" laser model in 2003, 11 he suggested that the bichromatic laser emission from laser dye solutions containing scattering random media is due to the presence of two fluorescent aggregates: monomers and dimers. The model can explain the many experimental results perfectly.…”

Section: Introductionmentioning

confidence: 99%

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Bichromatic emission in one-dimensional active random media

Liu

2011

Opt. Eng

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The relationship between spatial localization and bichromatic emission phenomena in one-dimensional (1D) active random media with gain is investigated by simultaneously solving Maxwell's equations and rate equations of electronic population. Results indicated that the increase of the concentration of the dye increases the spectral intensity of the dimer and the increase of the pump energy produces major radiative and nonradiative energy transfers from monomers to dimers. The increase of the ratio of the concentration of monomer to that of dimer would reduce the intensity of localization and increase the threshold of lasing mode. The competition between two lasing modes in 1D active random media can be controlled by local pumping. The results agree very well with the experimental data and offer a useful method for mode-selection. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Single‐, Dual‐, Triple, and Quadruple‐Wavelength Surface‐Emitting Lasing in Blue‐Phase Liquid Crystal

et al. 2022

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Soft organic lasers with multiwavelength output and high spectral purity are of crucial importance for versatile photonic devices, owing to their monochromaticity, coherence, and high intensity. However, there remain challenges for the achievement of surface‐emitting multiwavelength lasing in soft photonic crystals, and the relative mechanisms need to be investigated. Herein, single‐, dual‐, triple‐, and quadruple‐wavelength lasers are successfully achieved in dye‐doped blue‐phase liquid crystal (BPLC) film. The number and wavelength of the lasing peaks can be manipulated by tuning the center of the bandgap, the order parameter of the laser dye, the quality of the resonance cavity, and even the pump energy. For single‐wavelength lasing, a lasing peak with an ultranarrow linewidth of 0.04 nm (Q‐factor of 13 454) is achieved. Multiwavelength lasing is attained based on the following aspects: i) the narrow bandgaps of the BPLCs with full width at half maximum of 14–20 nm; ii) a laser dye with high gain over a wide wavelength band, having a low‐order parameter in the liquid crystal matrix; iii) appropriate relative positions between the reflection and fluorescence peaks; and iv) the highly ordered crystal lattice of BPLC film. The proposed single‐to‐quadruple‐wavelength surface‐emitting lasers can be employed as coherent light sources for next‐generation optical devices.

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Model for bichromatic laser emission from a laser dye with nanoparticle scatterers

Cited by 41 publications

References 26 publications

The crystal-size and power dependence of luminescence properties of Nd³⁺:LaAlO 3 nanopowders

The crystal-size and power dependence of luminescence properties of Nd³⁺:LaAlO 3 nanopowders

Bichromatic emission in one-dimensional active random media

Single‐, Dual‐, Triple, and Quadruple‐Wavelength Surface‐Emitting Lasing in Blue‐Phase Liquid Crystal

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Model for bichromatic laser emission from a laser dye with nanoparticle scatterers

Cited by 41 publications

References 26 publications

The crystal-size and power dependence of luminescence properties of Nd3+:LaAlO 3 nanopowders

The crystal-size and power dependence of luminescence properties of Nd3+:LaAlO 3 nanopowders

Bichromatic emission in one-dimensional active random media

Single‐, Dual‐, Triple, and Quadruple‐Wavelength Surface‐Emitting Lasing in Blue‐Phase Liquid Crystal

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Product

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The crystal-size and power dependence of luminescence properties of Nd³⁺:LaAlO 3 nanopowders

The crystal-size and power dependence of luminescence properties of Nd³⁺:LaAlO 3 nanopowders