Dispersive Dye Lasers

Duarte, Francisco

doi:10.1007/978-3-540-47385-5_2

Cited by 41 publications

(61 citation statements)

References 67 publications

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“…A further important parameter is the photostability of the laser emission over long operation times. Ideally, a high resistance to active medium photodegradation under repeated pumping is sought after 28 . A reasonable evaluation of the photostability of individual laser materials can be obtained by irradiating a small amount of solution with exactly the same pumping energy and geometry as used for the laser experiments (see Methods for details), and monitoring the evolution of the laser-induced fluorescence (LIF) intensity with respect to the number of pump pulses (see Methods for details).…”

Section: Resultsmentioning

confidence: 99%

“…The resulting crystalline powder is readily soluble in organic non-polar aprotic solvents (for example, cyclohexane) and can thus be handled experimentally in an analogous way to that of well-known organic dyes. Therefore, beyond stirring and sonication, no special experimental conditions were necessary for the preparation of laser solutions or for the collection of data, and we could base our study on the vast amount of knowledge on dye laser science and technology in the literature 28,41,42 .…”

Section: Methodsmentioning

confidence: 99%

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A borane laser

et al. 2015

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Emission from electronically excited species forms the basis for an important class of light sources-lasers. So far, commercially available solution-processed blue-emitting laser materials are based on organic compounds or semiconductor nanocrystals that have significant limitations: either low solubility, low chemical-and/or photo-stability and/or uncompetitive prices. Here we report a novel and competitive alternative to these existing laser materials that is based on boron hydrides, inorganic cluster compounds with a rich and diverse chemistry. We demonstrate that solutions of the borane anti-B 18 H 22 show, under pulsed excitation, blue laser emission at 406 nm with an efficiency (ratio of output/input energies) of 9.5%, and a photostability superior to many of the commercially available state-of-the-art blue laser dyes. This demonstration opens the doors for the development of a whole new class of laser materials based on a previously untapped resource for laser technology-the boranes.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

A borane laser

et al. 2015

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“…Precisely such a quantity is measured experimentally in the majority of cases [1,2,5,6,14]. In selecting an axis along the pumping radiation polarization vector, the definition given by (7) coincides with the technique by which we find the polarization degree in terms of the Stokesian parameters P = S 1 ⁄ S 0 , and it is reduced to the value of P 0 if radiation has only linearly polarized components.…”

Section: Methods Of Calculation Of the Effect Of Phase Correlations Ofmentioning

confidence: 99%

“…As a model active medium we selected an ethanol solution of Rhodamine 6G, the parameters for which were taken on the basis of the data of [14]. Numerical simulation was done by the Monte Carlo method with multiply repeated calculations of the Stokesian parameters in a one-pass mode of amplification with homogeneous distribution of pumping for different distributions of phases at a fixed value of ρ.…”

Section: Methods Of Calculation Of the Effect Of Phase Correlations Ofmentioning

confidence: 99%

Phase Correlations and Polarization Characteristics of Dye-Solution Laser Radiation

Буров

Varaksa

2005

J Appl Spectrosc

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The influence of phase correlations of components on the energy and polarization parameters of output radiation have been calculated within the framework of the formalism of polarization components. It is shown that these correlations have a marked effect only on the energy characteristics. At the same time, an analysis of the polarization characteristics of a probe wave provides rich information for the analysis of the phase-polarization structure of radiation. An analysis of experimental data allows the inference that the correlation of components is relatively weak even for lasers with a high-Q resonator and at a high excess of threshold values. Introduction.In a series of works [1-4], a new generalized approach to the description of formation of polarized radiation in a dye-solution laser was suggested and developed. It is based on the representation of laser radiation in the form of a superposition of polarized components, the polarization vectors of which encompass the entire set of possible polarization states. Based on the method of polarization components, a number of characteristic features in the dependences of the energy, polarization, and statistical characteristics of a dye-solution laser near the lasing threshold have been explained.The calculations [2-4] were based on the assumption of statistical independence of the polarization components, which is quite explicable from the viewpoint of the physical mechanism underlying the start-up of the process of lasing as a successive strengthening of spontaneous emission. It was assumed that the statistical independence of polarization components may be considered as the first approximation, and in the process of lasing build-up the phase correlation of polarization components may arise (spontaneously or as a result of any induced processes) and successively become stronger because of the presence of strong feedbacks. Strictly speaking, the method of polarization modes [5, 6], which rather adequately describes the characteristic features of the emission of polarized dye-solution laser radiation upon substantial excess over the threshold, is based on the assumption that the state of radiation polarization can generally be elliptic, i.e., the phase of a light wave is quite a definite one. In other words, the polarization modes are "pure" orthogonal states, the superposition of which completely describes polarized laser radiation.From the viewpoint of the adequacy of this approach, of certain interest are the results of [7,8], in which a change in the polarization of a scanning wave passing through the couvette of a dye-solution laser pumped by a highpower linearly polarized radiation was investigated. Actually, these experiments to a certain extent repeat the classical scheme of nonlinear polarization spectroscopy [9], and, to interpret the results, the basic elements of the corresponding theory of [10] were used: on excitation by a linearly polarized radiation, an orientational anisotropy is created in a molecular medium, and a scanning linearly polarized w...

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“…Thermal Sensitization. Photothermal actions of dyes are important in sensitizing optical disk data storage layers (9,20,52,53), medical photothermal effects with lasers (54,55), and spectrally sensitized superconductors (56). (Thermally developed silver behenate imaging materials are not spectrally sensitized thermally but depend on small amounts of spectrally sensitized silver halide particles that respond by the usual electron-transfer sensitization from the dye.)…”

Section: Hard Copy Systemsmentioning

confidence: 99%

Dyes, Sensitizing

Sturmer

2001

Kirk-Othmer Encyclopedia of Chemical Technology

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Spectral sensitizing dyes extend the responses of imaging materials to blue, green, red, and near infrared wavelengths. The most useful classes of dyes for photographic (silver halide) imaging are cyanine and merocyanine dyes, which provide excellent spectral sensitizing efficiencies, highly color‐selective (narrow, aggregated) absorption bands, and suitable solubility for handling during manufacturing and photographic development. Extensive industrial libraries of these compounds provide well‐tested synthetic pathways that are useful in tailoring dye structures for other applications. Electrophotography utilizes thiapyrylium dyes, squaraine dyes (analogs of merocyanines), or phthalocyanines to spectrally sensitize photohole conduction in colorless organic polymers. Red and infrared spectrally sensitized chemical reactions in medicine (eg, photodynamic therapy) use long‐wavelength dyes of the merocyanine, phthalocyanine, and hematoporphyrin classes. Spectral sensitizers from several dye classes either sensitize photochemical reactions or cause material degradation, especially those that interact to give high yields of singlet oxygen.

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Dispersive Dye Lasers

Cited by 41 publications

References 67 publications

A borane laser

A borane laser

Phase Correlations and Polarization Characteristics of Dye-Solution Laser Radiation

Dyes, Sensitizing

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