Multi-wavelength emission through self-induced second-order wave-mixing processes from a Nd3+ doped crystalline powder random laser

Moura, André L.; Jerez, Vladimir; Maia, Lauro J. Q.; Gomes, Anderson S. L.; Araújo, Cid B. de

doi:10.1038/srep13816

Cited by 47 publications

(35 citation statements)

References 35 publications

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“…Even though the emitted RL spectrum is very narrow, as typical of rare-earth-doped RLs373839, it does not indicate single mode operation31. In fact, it has been recently shown that even for an ultranarrow smooth spectrum, as those emitted from random Raman lasers40, the emission is multimode, as reported in41.…”

Section: Resultsmentioning

confidence: 97%

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Observation of Lévy distribution and replica symmetry breaking in random lasers from a single set of measurements

Gomes¹,

Raposo²,

Moura³

et al. 2016

Sci Rep

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Random lasers have been recently exploited as a photonic platform for studies of complex systems. This cross-disciplinary approach opened up new important avenues for the understanding of random-laser behavior, including Lévy-type distributions of strong intensity fluctuations and phase transitions to a photonic spin-glass phase. In this work, we employ the Nd:YBO random laser system to unveil, from a single set of measurements, the physical origin of the complex correspondence between the Lévy fluctuation regime and the replica-symmetry-breaking transition to the spin-glass phase. A novel unexpected finding is also reported: the trend to suppress the spin-glass behavior for high excitation pulse energies. The present description from first principles of this correspondence unfolds new possibilities to characterize other random lasers, such as random fiber lasers, nanolasers and small lasers, which include plasmonic-based, photonic-crystal and bio-derived nanodevices. The statistical nature of the emission provided by random lasers can also impact on their prominent use as sources for speckle-free laser imaging, which nowadays represents one of the most promising applications of random lasers, with expected progress even in cancer research.

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Section: Resultsmentioning

confidence: 97%

“…The RL system investigated in this work consisted of crystalline powders of Nd 3+ -doped YBO 3 (Nd:YBO) – Nd 3+ concentration: 4.0 mol%373839. The nanoparticle scatterers also act as the gain media.…”

Section: Resultsmentioning

confidence: 99%

Observation of Lévy distribution and replica symmetry breaking in random lasers from a single set of measurements

Gomes¹,

Raposo²,

Moura³

et al. 2016

Sci Rep

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“…Optical experiments were conducted in a similar scheme described in recent publications [14,25,26] where details are presented. The excitation source was the secondharmonic at 532 nm of a Nd-YAG laser operating at 5 Hz with beam area of 0.7 mm 2 , incidence angle of 30° with respect to the normal to the surface, and the excitation pulse energy (EPE) varied up to 4.60 mJ.…”

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confidence: 99%

Observation of photonic paramagnetic to spin-glass transition in a specially designed TiO_2 particle-based dye-colloidal random laser

et al. 2016

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By using specially designed nanoparticles scatterers which prevents photodegradation of the dye, we present clear demonstration of replica symmetry break and a photonic paramagnetic to spin-glass phase transition in a random laser operating in the incoherent feedback regime based on ethanol solution of Rhodamine 6G and amorphous TiO 2 nanoparticles. PACS number(s): 42.55. Zz, 42.55.Mv, 75.50.Lk. 3

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“…The study of occupation sites is vital to understanding the photoluminescent features and the ion-ion interaction mechanisms that lead to photoluminescence quenching. Thereby, the synthesis with other lanthanide ions can be planned for used as nanothermometers, solar energy concentrators and laser devices [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Structural and spectroscopic properties of Eu3+ doped Y4Al2O9 compounds through a soft chemical process

Gasparotto¹,

Tavares²,

Silva

et al. 2018

Journal of Luminescence

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The present work reports on the synthesis, structural and optical properties of (Y 1-x Eu x) 4 Al 2 O 9 powders, with x ranging from 0.001 to 0.030. We prepared the materials using a modified polymeric precursors method, and the effect of annealing temperature and Eu 3+ concentrations were evaluated. Structural and microstructural parameters, such as cell parameters, crystallite size and grain size were determined and evaluated by using the results from X-ray diffraction and high-resolution transmission electron microscopy techniques. An annealing temperature of 800°C was enough to obtain single Y 4 Al 2 O 9 crystalline phase with good distribution of Eu 3+ ions. Diffuse reflectance spectra and optical bandgap of 4.52 eV for (Y 0.995 Eu 0.005) 4 Al 2 O 9determined by Kubelka-Munk modelshowed good optical quality of the samples, which were considered non-conducting. All doped samples possessed visible photoluminescence emission from Eu 3+ ions under excitation at 393 nm, with higher emissions occurring in the red region from 5 D 0 → 7 F 2 transition, with R/O relation of 1.69 for the sample with x = 0.010. Analyzing photoluminescence emission spectra, the lifetime values and Judd-Ofelt parameters, we determined that Eu 3+ occupied three different sites of the Y 4 Al 2 O 9 (YAM) structure, replacing Y 3+ ions, with the quenching concentration occurring between x = 0.020 and x = 0.030. We noted that Eu 3+ ions are in a chemical environment with low polarization, and their degree of covalence is low. Finally, samples with x = 0.020 (Y 0.980 Eu 0.020) 4 Al 2 O 9 seems to be useful as red phosphors.

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Multi-wavelength emission through self-induced second-order wave-mixing processes from a Nd3+ doped crystalline powder random laser

Cited by 47 publications

References 35 publications

Observation of Lévy distribution and replica symmetry breaking in random lasers from a single set of measurements

Observation of Lévy distribution and replica symmetry breaking in random lasers from a single set of measurements

Observation of photonic paramagnetic to spin-glass transition in a specially designed TiO_2 particle-based dye-colloidal random laser

Structural and spectroscopic properties of Eu3+ doped Y4Al2O9 compounds through a soft chemical process

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