Bichromatic laser emission from dipyrromethene dyes incorporated into solid polymeric media

Álvarez, M.; Costela, Á.; García‐Moreno, I.; Amat‐Guerri, F.; Liras, Marta; Sastre, R.; Arbeloa, F. López; Prieto, J. Bañuelos; Arbeloa, Í. López

doi:10.1063/1.2743879

Cited by 5 publications

(1 citation statement)

References 50 publications

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“…Previous research has shown that the bichromatic incoherent RL emission could be tuned by changing the dye concentration, the density of scatterers, the pump energy, and the pump rate. [9,28,29] In this work, we confirmed that the bichromatic coherent lasing modes can be controlled by the polarization of the pump light. Figures 4(a at 56.07 µJ/pulse.…”

Section: Resultssupporting

confidence: 72%

Bichromatic coherent random lasing from dye-doped polymer stabilized blue phase liquid crystals controlled by pump light polarization

Wang

Yang

et al. 2016

Chinese Phys. B

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In this paper, we investigate the bichromatic coherent random lasing actions from the dye-doped polymer stabilized blue phase liquid crystals. Two groups of lasing peaks, of which the full widith at half maximum is about 0.3 nm, are clearly observed. The shorter-and longer-wavelength modes are associated with the excitation of the single laser dye (DCM) monomers and dimers respectively. The experimental results show that the competition between the two groups of the lasing peaks can be controlled by varying the polarization of the pump light. When the polarization of the pump light is rotated from 0 • to 90 • , the intensity of the shorter-wavelength lasing peak group reduces while the intensity of the longer-wavelength lasing peak group increases. In addition, a red shift of the longer-wavelength modes is also observed and the physical mechanisms behind the red-shift phenomenon are discussed.

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Section: Resultssupporting

confidence: 72%

Bichromatic coherent random lasing from dye-doped polymer stabilized blue phase liquid crystals controlled by pump light polarization

Wang

Yang

et al. 2016

Chinese Phys. B

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Unprecedented J‐Aggregated Dyes in Pure Organic Solvents

Manzano

Esnal

Marqués-Matesanz

et al. 2016

Adv Funct Materials

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The design and synthesis of the fi rst organic dyes enabling spontaneous formation of stable J-aggregates in common organic solvents without additives is described. The new dyes are O -BODIPYs with a B -spiranic 4,4-diacyloxyl substitution pattern. Key to the effectiveness of the J-aggregation process is the high conformational rigidity of the B -spiranic molecular design as well as the orthogonal disposition of the B -diacyloxyl substituent and the meso -aryl group with respect to the mean plane of the boradiazaindacene. Atomistic simulations, both in vacuum and in a solvent cage, support the dynamics of the J-aggregation process as well as its dependence on the alkylation pattern of the BODIPY chromophore. A detailed analysis of the photophysical and laser properties of the new dyes provides convincing evidence for the unambiguous assignment of these J-aggregates and their dependence on the environmental conditions.

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Single bead near-infrared random laser based on silica-gel infiltrated with Rhodamine 640

Moura

Barbosa-Silva

Dominguez

et al. 2018

Journal of Applied Physics

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Photoluminescence properties of single bead silica-gel (SG) embedded with a laser-dye were studied aiming at the operation of near-infrared (NIR) Random Lasers (RLs). The operation of RLs in the NIR spectral region is especially important for biological applications since the optical radiation has deep tissue penetration with negligible damage. Since laser-dyes operating in the NIR have poor stability and are poor emitters, ethanol solutions of Rhodamine 640 (Rh640) infiltrated in SG beads were used. The Rh640 concentrations in ethanol varied from 10 À5 to 10 À2 M and the excitation at 532 nm was made by using a 7 ns pulsed laser. The proof-of-principle RL scheme herein presented was adopted in order to protect the dye-molecules from the environment and to favor formation of aggregates. The RL emission from %650 nm to 720 nm, beyond the typical Rh640 monomer and dimer wavelengths emissions range, was attributed to the trade-off between reabsorption and reemission processes along the light pathways inside the SG bead and the contribution of Rh640 aggregates.

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Bichromatic laser emission from dipyrromethene dyes incorporated into solid polymeric media

Cited by 5 publications

References 50 publications

Bichromatic coherent random lasing from dye-doped polymer stabilized blue phase liquid crystals controlled by pump light polarization

Bichromatic coherent random lasing from dye-doped polymer stabilized blue phase liquid crystals controlled by pump light polarization

Unprecedented J‐Aggregated Dyes in Pure Organic Solvents

Single bead near-infrared random laser based on silica-gel infiltrated with Rhodamine 640

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