The effect of dye concentration and cell thickness on dye–polymer random laser action

Ejbarah, R. A.; Jassim, J. M.; Hamidi, Seyedeh Mehri

doi:10.1007/s11082-021-02742-0

Cited by 8 publications

(5 citation statements)

References 22 publications

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“…As for the coherent laser, the spike width had reached 0.6 nm. All findings discussed and reviewed are in full agreement with [17].…”

Section: Influence Of the Size Of Ag Nanohexagonalsupporting

confidence: 73%

“…The spectral location of the surface plasmon resonance is strongly influenced by the type of material, shape, size, and the surrounding environment of the nanoparticle. Variation of these parameters causes spectral tuning of the plasmon resonance to interfere with the emission spectrum of the gain medium [17]. Therefore, metallic nanomaterials may contribute to increasing luminescence and influence the rate of radioactive relaxation.…”

Section: Introductionmentioning

confidence: 99%

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Random laser action in the visible region by dye-based sliver nano-hexagonal colloid media

Ejbarah¹,

Jassim²,

Yazdanfar³

et al. 2021

Phys. Scr.

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In our attempt to reduce the threshold for dye-based random lasers, a new kind of random lasing media is demonstrated based on silver nano-hexagonal as scattering centers. For this purpose, we use a chemical method to synthesize nano hexagonal silver scatterer points and dissolve them in polymer and Rhodamine B dye media in different concentrations and different sizes. Our results from these samples under different pumping power, confirm the strong dependence on the sizes and concentration on the transition from incoherent to the coherent random laser, which is starts from 0.061 MW cm −2 as threshold power. This threshold power and linewidths of emission peaks decrease by an increase in the size and concentrations of nano-hexagonal points to 0.04 MW cm −2 and 0.2 nm, respectively.

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“…As for the coherent laser, the spike width had reached 0.6 nm. All findings discussed and reviewed are in full agreement with [17].…”

Section: Influence Of the Size Of Ag Nanohexagonalsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Random laser action in the visible region by dye-based sliver nano-hexagonal colloid media

Ejbarah¹,

Jassim²,

Yazdanfar³

et al. 2021

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In that case, more dye molecules are excited to higher energy levels, providing strong field feedback to the laser. Thus, the excitation efficiency is improved, obtaining higher emission intensity and lower threshold, as shown in figure 7(e) [28,49,50]. The mechanism of high-concentration SiC nanowires to the lasing is shown in figure 7(f).…”

Section: Resultsmentioning

confidence: 99%

Random laser emission from dye-doped polymer films enhanced by SiC nanowires

Shen¹,

Shi²,

Zhao³

et al. 2023

J. Phys. D: Appl. Phys.

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As the third-generation semiconductor electronic material, silicon carbide (SiC) has good chemical stability and mechanical properties, leading to wide use in optoelectronic components, fiber sensing and detectors. However, there are few important reports on its application in the research of random laser. Hereby, we built a polymer random laser system with SiC nanowires as a scattering medium doped with dye by the spin coating method. The effect of different SiC concentrations on random laser properties and the enhancement mechanism are studied. The lasing intensity increases and threshold decrease in large concentration SiC nanowires at the same lasing system, and the minimum threshold is 20 μJ/pulse. By increasing the SiC concentration, the mean free path of photon scattering decreases, which promotes the photon gain effect and improves the laser performance. However, when the concentration of SiC nanowires is too large, the mean free path of photon scattering decreases further, and the self-absorption of fluorescence radiation emerges. Thus, fluorescence quenching is produced, leading to a negative effect on laser performance. Furthermore, the lasing wavelength can be adjusted by tuning the SiC nanowires concentrations, reaching 14nm. The random laser enhanced by SiC nanowires is stable and pumped repeatable, which could pave the way to promote the application of SiC and achieve low-cost and high-performance random laser.

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“…Reducing the random laser threshold can increase the efficiency and lifespan of a laser, as well as reduce energy consumption and costs, which will promote the miniaturization and integration of random lasers. However, threshold reduction remains a challenge in practical applications [12,13].…”

Section: Introductionmentioning

confidence: 99%

The Origin of Threshold Reduction in Random Lasers Based on MoS2/Au NPs: Charge Transfer

Huo,

Sun,

Zhang

et al. 2024

Photonics

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Random lasers have attracted much attention in recent years owing to their advantages of a simple fabrication process, low processing cost, and material flexibility for any lasing wavelengths. They provide a roadmap for the design of ultra-bright lighting, displays, etc. However, the threshold reduction in random nanolasers remains a challenge in practical applications. In this work, lower-threshold random laser action from monolayer molybdenum disulfide film-encapsulated Au nanoparticles (MoS2/Au NPs) is demonstrated. The observed laser action of the MoS2/Au NPs shows a lower threshold of about 0.564 µJ/mm2, which is about 46.2% lower than the threshold of random lasers based on Au NPs. We proposed that the charge transfer between MoS2 and the gain material is the main reason for the reduction in the random laser threshold. The finite-difference time-domain (FDTD) method was used to calculate the lasing action of these two nanostructures. When charge transfer is taken into account, the theoretically calculated threshold of the MoS2/Au NPs is reduced by 46.8% compared to Au NP samples, which is consistent with the experimental results. This study provides a new mechanism to achieve low-threshold and high-quality random lasers, which has the potential to facilitate the application of random lasers and the development of high-performance optoelectronic devices.

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The effect of dye concentration and cell thickness on dye–polymer random laser action

Cited by 8 publications

References 22 publications

Random laser action in the visible region by dye-based sliver nano-hexagonal colloid media

Random laser action in the visible region by dye-based sliver nano-hexagonal colloid media

Random laser emission from dye-doped polymer films enhanced by SiC nanowires

The Origin of Threshold Reduction in Random Lasers Based on MoS2/Au NPs: Charge Transfer

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