The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Angel Costela - One of the best experts on this subject based on the ideXlab platform.
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solid state Dye Lasers with scattering feedback
Progress in Quantum Electronics, 2013Co-Authors: Angel Costela, Luis Cerdan, I GarciamorenoAbstract:Abstract Over the last decade, significant advances have been made toward the development of practical, tunable solid state Dye Lasers, which resulted in improved lasing efficiency with reduced Dye photodegradation. To achieve this goal, a “chemical” approach was followed, where attention was focused onto the particular Dye/host interaction and compatibility, specifically choosing already existing hosts for a given Dye, synthesizing new Dyes and/or matrices, or chemically modifying existing ones. Nevertheless, this approach was limited by a single fact learnt from the experience: there is no universal matrix which optimizes the efficiency and photostability of all Dyes. This limitation could be overcome by following a “physical” approach, where the emission properties of the active medium are tailored by means of physical and structural modifications of the Dye host. Following this approach, in this paper recent theoretical and experimental work is reviewed where it is demonstrated that following a simultaneous “physical” and “chemical” approach to tailor the emission properties of the host materials for solid state Dye Lasers, may lead, under specific circumstances, to the improvement of both the laser efficiency and photostability. In particular, it is demonstrated that optical scattering is not always detrimental either to conventional bulk Lasers (laser rods or colloidal suspensions) or to integrated devices, but may give place, on the contrary, to dramatic improvements in the laser operation of organic (hybrid) laser rods, and to alternative ways of obtaining laser light from integrated devices based on the phenomenon of coherent random lasing, where feedback is provided by light scattering in an appropriate medium, without the need to manufacture complex periodic structures in the substrate. The processing and pumping flexibility of these materials, together with their low cost and capability of efficient emission across the whole visible spectrum makes them very attractive for the fabrication and development of coherent light sources suitable for integration in optoelectronic and disposable spectroscopic and sensing devices.
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Dye doped polyhedral oligomeric silsesquioxane poss modified polymeric matrices for highly efficient and photostable solid state Lasers
Advanced Functional Materials, 2009Co-Authors: R Sastre, Angel Costela, Olga Garcia, Leoncio Garrido, Virginia Martin, Jose Luis Chiara, Beatriz Trastoy, I GarciamorenoAbstract:10 paginas, 10 figuras, 5 tablas.-- Supporting Information is available online from Wiley InterScience or from the author.-- The materials described in this work and their utilization in solid-state Dye Lasers are covered by Spanish Patent No. P200800220 filed on January 2008.
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materials for a reliable solid state Dye laser at the red spectral edge
Advanced Functional Materials, 2009Co-Authors: I Garciamoreno, Angel Costela, Virginia Martin, Mercedes Pintadosierra, R SastreAbstract:Financed by the Spanish MICINN (Project MAT2007-65778-C02-01). V. Martin thanks CSIC for her JAE postdoctoral contract. M. Pintado-Sierra acknowledges a research grant for MICINN (cofinanced by Fondo Social Europeo). The materials described in this work and their utilization in solidstate Dye Lasers are covered by Spanish Patent N- P200802558, filed on September 2008.
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highly photostable solid state Dye Lasers based on silicon modified organic matrices
Journal of Applied Physics, 2007Co-Authors: Angel Costela, I Garciamoreno, Olga Garcia, D Del Agua, R SastreAbstract:We report on the synthesis, characterization, and physical properties of modified polymeric matrices incorporating silicon atoms in their structure and doped with laser Dyes. When the silicon-modified organic matrices incorporated pyrromethene 567 (PM567) and pyrromethene 597 (PM597) Dyes as actual solid solutions, highly photostable laser operation with reasonable, nonoptimized efficiencies was obtained under transversal pumping at 532nm. At a pump repetition rate of 10Hz, the intensity of the laser emission remained at the level or above the initial lasing intensity after 100 000 pump pulses in the same position of the sample, corresponding to an estimated accumulated pump energy absorbed by the system of 518 and 1295GJ∕mol for PM567 and PM597, respectively. When the pump repetition rate was increased to 30Hz, the laser emission of Dye PM567 decreased steadily and the output energy fell to one-half its initial value after an accumulated pump energy of 989 GJ/mol. Dye PM597 demonstrated a remarkable phot...
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linear and cross linked polymeric solid state Dye Lasers based on 8 substituted alkyl analogues of pyrromethene 567
Applied Physics B, 2005Co-Authors: Maria Dolores Alvarez, Angel Costela, I Garciamoreno, Clara M Gomez, F Amatguerri, Marta Liras, R SastreAbstract:The lasing properties of analogues of the commercial laser Dye pyrromethene 567 (PM567) incorporated (dissolved or copolymerized) into polymeric matrices have been studied using both linear and cross-linked methyl methacrylate-based copolymers with different degrees of functionalization. All synthesized Dyes have the chromophore core of PM567 but with an ω-acyloxypolymethylene chain at position 8. In general, the new materials exhibited laser emission with higher efficiencies and much higher photostabilities than those containing the commercial Dye PM567 under the same experimental conditions. Lasing efficiencies of up to 40% were obtained under transversal pumping at 534 nm. The highest photostabilities, with the laser output remaining stable or dropping by less than 15% after 100 000 pump pulses at the same position of the sample, were reached in cross-linked materials with Dyes covalently linked to the polymeric chains. When the polymeric samples were incorporated into a grazing-incidence grating oscillator, narrow-line-width operation with tuning ranges of up to 40 nm was obtained. These results show that efficient and photostable solid-state Dye Lasers competitive with their liquid counterparts can be developed by adequate chemical modifications in the Dye molecules, as well as by the selection of appropriate polymeric formulations.
R Sastre - One of the best experts on this subject based on the ideXlab platform.
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Dye doped polyhedral oligomeric silsesquioxane poss modified polymeric matrices for highly efficient and photostable solid state Lasers
Advanced Functional Materials, 2009Co-Authors: R Sastre, Angel Costela, Olga Garcia, Leoncio Garrido, Virginia Martin, Jose Luis Chiara, Beatriz Trastoy, I GarciamorenoAbstract:10 paginas, 10 figuras, 5 tablas.-- Supporting Information is available online from Wiley InterScience or from the author.-- The materials described in this work and their utilization in solid-state Dye Lasers are covered by Spanish Patent No. P200800220 filed on January 2008.
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materials for a reliable solid state Dye laser at the red spectral edge
Advanced Functional Materials, 2009Co-Authors: I Garciamoreno, Angel Costela, Virginia Martin, Mercedes Pintadosierra, R SastreAbstract:Financed by the Spanish MICINN (Project MAT2007-65778-C02-01). V. Martin thanks CSIC for her JAE postdoctoral contract. M. Pintado-Sierra acknowledges a research grant for MICINN (cofinanced by Fondo Social Europeo). The materials described in this work and their utilization in solidstate Dye Lasers are covered by Spanish Patent N- P200802558, filed on September 2008.
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highly photostable solid state Dye Lasers based on silicon modified organic matrices
Journal of Applied Physics, 2007Co-Authors: Angel Costela, I Garciamoreno, Olga Garcia, D Del Agua, R SastreAbstract:We report on the synthesis, characterization, and physical properties of modified polymeric matrices incorporating silicon atoms in their structure and doped with laser Dyes. When the silicon-modified organic matrices incorporated pyrromethene 567 (PM567) and pyrromethene 597 (PM597) Dyes as actual solid solutions, highly photostable laser operation with reasonable, nonoptimized efficiencies was obtained under transversal pumping at 532nm. At a pump repetition rate of 10Hz, the intensity of the laser emission remained at the level or above the initial lasing intensity after 100 000 pump pulses in the same position of the sample, corresponding to an estimated accumulated pump energy absorbed by the system of 518 and 1295GJ∕mol for PM567 and PM597, respectively. When the pump repetition rate was increased to 30Hz, the laser emission of Dye PM567 decreased steadily and the output energy fell to one-half its initial value after an accumulated pump energy of 989 GJ/mol. Dye PM597 demonstrated a remarkable phot...
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linear and cross linked polymeric solid state Dye Lasers based on 8 substituted alkyl analogues of pyrromethene 567
Applied Physics B, 2005Co-Authors: Maria Dolores Alvarez, Angel Costela, I Garciamoreno, Clara M Gomez, F Amatguerri, Marta Liras, R SastreAbstract:The lasing properties of analogues of the commercial laser Dye pyrromethene 567 (PM567) incorporated (dissolved or copolymerized) into polymeric matrices have been studied using both linear and cross-linked methyl methacrylate-based copolymers with different degrees of functionalization. All synthesized Dyes have the chromophore core of PM567 but with an ω-acyloxypolymethylene chain at position 8. In general, the new materials exhibited laser emission with higher efficiencies and much higher photostabilities than those containing the commercial Dye PM567 under the same experimental conditions. Lasing efficiencies of up to 40% were obtained under transversal pumping at 534 nm. The highest photostabilities, with the laser output remaining stable or dropping by less than 15% after 100 000 pump pulses at the same position of the sample, were reached in cross-linked materials with Dyes covalently linked to the polymeric chains. When the polymeric samples were incorporated into a grazing-incidence grating oscillator, narrow-line-width operation with tuning ranges of up to 40 nm was obtained. These results show that efficient and photostable solid-state Dye Lasers competitive with their liquid counterparts can be developed by adequate chemical modifications in the Dye molecules, as well as by the selection of appropriate polymeric formulations.
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polymer filled nanoporous silica aerogels as hosts for highly stable solid state Dye Lasers
Journal of Physical Chemistry B, 2005Co-Authors: Angel Costela, R Sastre, Clara M Gomez, Olga Garcia, Garcia I Moreno, Anna Roig, Elies MolinsAbstract:New hybrid solid-state Dye laser materials based on highly porous silica aerogels have been synthesized. The open porous network of the aerogel was saturated with laser Dyes dissolved in appropriate organic monomers, and polymerization took place inside the silica structure. The resulting polymer-filled nanoporous aerogel (PFNPA) was cast in a cylindrical shape, forming monoliths that were used as gain media in solid-state Dye Lasers. When the PFNPA incorporated pyrromethene Dyes, highly photostable laser emission with good lasing efficiency was obtained. Under the demanding conditions of tightly focused transversal pumping with 532 nm, 5 mJ pulses at 10 Hz repetition rate, the commercial Dye Pyrromethene 567 exhibited laser action with only a 10% drop in the laser output after 10(6) pump pulses in the same position of the sample.
I Garciamoreno - One of the best experts on this subject based on the ideXlab platform.
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solid state Dye Lasers with scattering feedback
Progress in Quantum Electronics, 2013Co-Authors: Angel Costela, Luis Cerdan, I GarciamorenoAbstract:Abstract Over the last decade, significant advances have been made toward the development of practical, tunable solid state Dye Lasers, which resulted in improved lasing efficiency with reduced Dye photodegradation. To achieve this goal, a “chemical” approach was followed, where attention was focused onto the particular Dye/host interaction and compatibility, specifically choosing already existing hosts for a given Dye, synthesizing new Dyes and/or matrices, or chemically modifying existing ones. Nevertheless, this approach was limited by a single fact learnt from the experience: there is no universal matrix which optimizes the efficiency and photostability of all Dyes. This limitation could be overcome by following a “physical” approach, where the emission properties of the active medium are tailored by means of physical and structural modifications of the Dye host. Following this approach, in this paper recent theoretical and experimental work is reviewed where it is demonstrated that following a simultaneous “physical” and “chemical” approach to tailor the emission properties of the host materials for solid state Dye Lasers, may lead, under specific circumstances, to the improvement of both the laser efficiency and photostability. In particular, it is demonstrated that optical scattering is not always detrimental either to conventional bulk Lasers (laser rods or colloidal suspensions) or to integrated devices, but may give place, on the contrary, to dramatic improvements in the laser operation of organic (hybrid) laser rods, and to alternative ways of obtaining laser light from integrated devices based on the phenomenon of coherent random lasing, where feedback is provided by light scattering in an appropriate medium, without the need to manufacture complex periodic structures in the substrate. The processing and pumping flexibility of these materials, together with their low cost and capability of efficient emission across the whole visible spectrum makes them very attractive for the fabrication and development of coherent light sources suitable for integration in optoelectronic and disposable spectroscopic and sensing devices.
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Dye doped polyhedral oligomeric silsesquioxane poss modified polymeric matrices for highly efficient and photostable solid state Lasers
Advanced Functional Materials, 2009Co-Authors: R Sastre, Angel Costela, Olga Garcia, Leoncio Garrido, Virginia Martin, Jose Luis Chiara, Beatriz Trastoy, I GarciamorenoAbstract:10 paginas, 10 figuras, 5 tablas.-- Supporting Information is available online from Wiley InterScience or from the author.-- The materials described in this work and their utilization in solid-state Dye Lasers are covered by Spanish Patent No. P200800220 filed on January 2008.
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materials for a reliable solid state Dye laser at the red spectral edge
Advanced Functional Materials, 2009Co-Authors: I Garciamoreno, Angel Costela, Virginia Martin, Mercedes Pintadosierra, R SastreAbstract:Financed by the Spanish MICINN (Project MAT2007-65778-C02-01). V. Martin thanks CSIC for her JAE postdoctoral contract. M. Pintado-Sierra acknowledges a research grant for MICINN (cofinanced by Fondo Social Europeo). The materials described in this work and their utilization in solidstate Dye Lasers are covered by Spanish Patent N- P200802558, filed on September 2008.
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highly photostable solid state Dye Lasers based on silicon modified organic matrices
Journal of Applied Physics, 2007Co-Authors: Angel Costela, I Garciamoreno, Olga Garcia, D Del Agua, R SastreAbstract:We report on the synthesis, characterization, and physical properties of modified polymeric matrices incorporating silicon atoms in their structure and doped with laser Dyes. When the silicon-modified organic matrices incorporated pyrromethene 567 (PM567) and pyrromethene 597 (PM597) Dyes as actual solid solutions, highly photostable laser operation with reasonable, nonoptimized efficiencies was obtained under transversal pumping at 532nm. At a pump repetition rate of 10Hz, the intensity of the laser emission remained at the level or above the initial lasing intensity after 100 000 pump pulses in the same position of the sample, corresponding to an estimated accumulated pump energy absorbed by the system of 518 and 1295GJ∕mol for PM567 and PM597, respectively. When the pump repetition rate was increased to 30Hz, the laser emission of Dye PM567 decreased steadily and the output energy fell to one-half its initial value after an accumulated pump energy of 989 GJ/mol. Dye PM597 demonstrated a remarkable phot...
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linear and cross linked polymeric solid state Dye Lasers based on 8 substituted alkyl analogues of pyrromethene 567
Applied Physics B, 2005Co-Authors: Maria Dolores Alvarez, Angel Costela, I Garciamoreno, Clara M Gomez, F Amatguerri, Marta Liras, R SastreAbstract:The lasing properties of analogues of the commercial laser Dye pyrromethene 567 (PM567) incorporated (dissolved or copolymerized) into polymeric matrices have been studied using both linear and cross-linked methyl methacrylate-based copolymers with different degrees of functionalization. All synthesized Dyes have the chromophore core of PM567 but with an ω-acyloxypolymethylene chain at position 8. In general, the new materials exhibited laser emission with higher efficiencies and much higher photostabilities than those containing the commercial Dye PM567 under the same experimental conditions. Lasing efficiencies of up to 40% were obtained under transversal pumping at 534 nm. The highest photostabilities, with the laser output remaining stable or dropping by less than 15% after 100 000 pump pulses at the same position of the sample, were reached in cross-linked materials with Dyes covalently linked to the polymeric chains. When the polymeric samples were incorporated into a grazing-incidence grating oscillator, narrow-line-width operation with tuning ranges of up to 40 nm was obtained. These results show that efficient and photostable solid-state Dye Lasers competitive with their liquid counterparts can be developed by adequate chemical modifications in the Dye molecules, as well as by the selection of appropriate polymeric formulations.
Anders Kristensen - One of the best experts on this subject based on the ideXlab platform.
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Emission wavelength of multilayer distributed feedback Dye Lasers
Applied Physics Letters, 2012Co-Authors: Christoph Vannahme, Cameron L. C. Smith, Mads Brøkner Christiansen, Anders KristensenAbstract:Precise emission wavelength modeling is essential for understanding and optimization of distributed feedback (DFB) Lasers. An analytical approach for determining the emission wavelength based on setting the propagation constant of the Bragg condition and solving for the resulting slab waveguide mode is reported. The method is advantageous to established methods as it predicts the wavelength precisely with reduced complexity. Four-layered hybrid polymer-TiO2 first order DFB Dye Lasers with different TiO2 layer thicknesses are studied. Varying the TiO2 thickness from 0 nm to 30 nm changes the emission wavelength by 7 nm with compelling agreement of modeling results to experimental measurements.
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diffusion driven optofluidic Dye Lasers encapsulated into polymer chips
Lab on a Chip, 2012Co-Authors: Tobias Wienhold, Christoph Vannahme, Mads Brøkner Christiansen, Anders Kristensen, Felix Breithaupt, Willy Dorfler, Timo MappesAbstract:Lab-on-a-chip systems made of polymers are promising for the integration of active optical elements, enabling e.g. on-chip excitation of fluorescent markers or spectroscopy. In this work we present diffusion operation of tunable optofluidic Dye Lasers in a polymer foil. We demonstrate that these first order distributed feedback Lasers can be operated for more than 90 min at a pulse repetition rate of 2 Hz without fluidic pumping. Ultra-high output pulse energies of more than 10 μJ and laser thresholds of 2 μJ are achieved for resonator lengths of 3 mm. By introducing comparatively large on-chip Dye solution reservoirs, the required exchange of Dye molecules is accomplished solely by diffusion. Polymer chips the size of a microscope cover slip (18 × 18 mm2) were fabricated in batches on a wafer using a commercially available polymer (TOPAS® Cyclic Olefin Copolymer). Thermal imprinting of micro- and nanoscale structures into 100 μm foils simultaneously defines photonic resonators, liquid-core waveguides, and fluidic reservoirs. Subsequently, the fluidic structures are sealed with another 220 μm foil by thermal bonding. Tunability of laser output wavelengths over a spectral range of 24 nm on a single chip is accomplished by varying the laser grating period in steps of 2 nm. Low-cost manufacturing suitable for mass production, wide laser tunability, ultra-high output pulse energies, and long operation times without external fluidic pumping make these on-chip Lasers suitable for a wide range of lab-on-a-chip applications, e.g. on-chip spectroscopy, biosensing, excitation of fluorescent markers, or surface enhanced Raman spectroscopy (SERS).
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polymer photonic crystal Dye Lasers as optofluidic cell sensors
Optics Express, 2009Co-Authors: Mads Brøkner Christiansen, Niels Asger Mortensen, Joanna M Lopacinska, Mogens Havsteen Jakobsen, Martin Dufva, Anders KristensenAbstract:Dye doped hybrid polymer Lasers are implemented as label free evanescent field biosensors for detection of cells. It is demonstrated that although the coverage is irregular and the cells extend over several lattice constants, the emission wavelength depends linearly on the fraction of the surface covered by the HeLa cells used as model system. Design parameters relating to photonic crystal sensing of large objects are identified and discussed. The Lasers are chemically modified to bind cells and molecules with flexible UV activated linker molecules.
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bleaching and diffusion dynamics in optofluidic Dye Lasers
Applied Physics Letters, 2007Co-Authors: M Gersborghansen, S Balslev, Niels Asger Mortensen, Anders KristensenAbstract:The authors have investigated the bleaching dynamics that occur in optofluidic Dye Lasers where the liquid laser Dye in a microfluidic channel is locally bleached due to optical pumping. They find that for microfluidic devices, the Dye bleaching may be compensated through diffusion of Dye molecules alone. By relying on diffusion rather than convection to generate the necessary Dye replenishment, their observation potentially allows for a significant simplification of optofluidic Dye laser device layouts, omitting the need for cumbersome and costly external fluidic handling or on-chip microfluidic pumping devices.
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bleaching and diffusion dynamics in optofluidic Dye Lasers
arXiv: Optics, 2007Co-Authors: M Gersborghansen, S Balslev, Niels Asger Mortensen, Anders KristensenAbstract:We have investigated the bleaching dynamics that occur in optofluidic Dye Lasers where the liquid laser Dye in a microfluidic channel is locally bleached due to optical pumping. We find that for microfluidic devices, the Dye bleaching may be compensated through diffusion of Dye molecules alone. By relying on diffusion rather than convection to generate the necessary Dye replenishment, our observation potentially allows for a significant simplification of optofluidic Dye laser device layouts, omitting the need for cumbersome and costly external fluidic handling or on-chip microfluidic pumping devices.
Olga Garcia - One of the best experts on this subject based on the ideXlab platform.
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Dye doped polyhedral oligomeric silsesquioxane poss modified polymeric matrices for highly efficient and photostable solid state Lasers
Advanced Functional Materials, 2009Co-Authors: R Sastre, Angel Costela, Olga Garcia, Leoncio Garrido, Virginia Martin, Jose Luis Chiara, Beatriz Trastoy, I GarciamorenoAbstract:10 paginas, 10 figuras, 5 tablas.-- Supporting Information is available online from Wiley InterScience or from the author.-- The materials described in this work and their utilization in solid-state Dye Lasers are covered by Spanish Patent No. P200800220 filed on January 2008.
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highly photostable solid state Dye Lasers based on silicon modified organic matrices
Journal of Applied Physics, 2007Co-Authors: Angel Costela, I Garciamoreno, Olga Garcia, D Del Agua, R SastreAbstract:We report on the synthesis, characterization, and physical properties of modified polymeric matrices incorporating silicon atoms in their structure and doped with laser Dyes. When the silicon-modified organic matrices incorporated pyrromethene 567 (PM567) and pyrromethene 597 (PM597) Dyes as actual solid solutions, highly photostable laser operation with reasonable, nonoptimized efficiencies was obtained under transversal pumping at 532nm. At a pump repetition rate of 10Hz, the intensity of the laser emission remained at the level or above the initial lasing intensity after 100 000 pump pulses in the same position of the sample, corresponding to an estimated accumulated pump energy absorbed by the system of 518 and 1295GJ∕mol for PM567 and PM597, respectively. When the pump repetition rate was increased to 30Hz, the laser emission of Dye PM567 decreased steadily and the output energy fell to one-half its initial value after an accumulated pump energy of 989 GJ/mol. Dye PM597 demonstrated a remarkable phot...
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polymer filled nanoporous silica aerogels as hosts for highly stable solid state Dye Lasers
Journal of Physical Chemistry B, 2005Co-Authors: Angel Costela, R Sastre, Clara M Gomez, Olga Garcia, Garcia I Moreno, Anna Roig, Elies MolinsAbstract:New hybrid solid-state Dye laser materials based on highly porous silica aerogels have been synthesized. The open porous network of the aerogel was saturated with laser Dyes dissolved in appropriate organic monomers, and polymerization took place inside the silica structure. The resulting polymer-filled nanoporous aerogel (PFNPA) was cast in a cylindrical shape, forming monoliths that were used as gain media in solid-state Dye Lasers. When the PFNPA incorporated pyrromethene Dyes, highly photostable laser emission with good lasing efficiency was obtained. Under the demanding conditions of tightly focused transversal pumping with 532 nm, 5 mJ pulses at 10 Hz repetition rate, the commercial Dye Pyrromethene 567 exhibited laser action with only a 10% drop in the laser output after 10(6) pump pulses in the same position of the sample.
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highly efficient and stable doped hybrid organic inorganic materials for solid state Dye Lasers
Chemical Physics Letters, 2004Co-Authors: Angel Costela, I Garciamoreno, Clara M Gomez, Olga Garcia, Leoncio Garrido, R SastreAbstract:Abstract Significant enhancement on the laser action of Rhodamine 6G (Rh6G) has been obtained for solid-state Dye Lasers based on hybrid matrices obtained by simultaneous polymerisation of 2-hydroxyethyl methacrylate with different weight proportions of tetraethoxysilane or tetramethoxysilane. Lasing efficiencies of up 28% and high stabilities, with no sign of degradation, albeit with some oscillations, in the initial laser output after 100 000 pump pulses at 10 Hz were demonstrated when pumping the samples transversely at 532 nm with 5.5 mJ/pulse. This photostability is, to the best of our knowledge, the highest achieved to date for organic, inorganic and hybrid matrices doped with Rh6G.
