Spectral and temporal characteristics of fluorescence of drops comprising dissolved dye excited by the IR laser radiation

Donchenko, V. A.; Zemlyanov, A. A.; Kibitkin, P. P.

doi:10.1016/s1350-4495(99)00042-0

Infrared Physics & Technology

2000

DOI: 10.1016/s1350-4495(99)00042-0

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Spectral and temporal characteristics of fluorescence of drops comprising dissolved dye excited by the IR laser radiation

V. A. Donchenko

A. A. Zemlyanov

P. P. Kibitkin

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Cited by 3 publications

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“…Moreover, almost all works devoted to the study of stimulated fluorescence of aerosols and drops excited by nano-and picasecond pulses were carried out with this dye [7][8][9]. The two-photon fluorescence spectrum of the drop with the dye was registered using an MDR-12 monochromator and a CCD camera.…”

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“…1). From works in which fluorescence of millimeter drops with a dye excited due to one-and two-photon absorption of laser pulses has been investigated, it is well known that the second longwavelength spectral peak represents the lasing spectrum of the dye in the high-Q resonator -the subsurface drop regionon the so-called whispering gallery modes [8,9,12]. The localization of the lasing spectrum on the whispering gallery modes in the long-wavelength wing of the fluorescence dye spectrum arises due to the reabsorption effect, that is, the reabsorption of short-wavelength photons of pumping radiation, generated for a great number of passages through the whispering gallery forming a resonator, by dye molecules.…”

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Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses

et al. 2005

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Results of investigations into the spectral and power characteristics of two-photon fluorescence of a liquid drop with the Rhodamine 6G dye irradiated by femtosecond laser pulses are presented. It is demonstrated that stimulated emission of two types is realized in drops with the concentrated dye solution, namely, superfluorescence within the drop volume and lasing on whispering gallery modes.Creation of laser systems capable of generating femtosecond light pulses with high intensity sufficient for realization of multiphoton effects in the process of radiation interaction with substance in the middle 80s stimulated the formation of a number of new directions of modern physics and technology. Among these are new methods of laser control over physical and chemical processes based on the selective multiphoton absorption of femtosecond radiation by substance molecules, including finely dispersed substance (femtochemistry) [1, 2]. Creation of highly informative optical communication channels in the atmosphere also posed the problem of studying the multiphoton interaction of femtosecond radiation with substance, in particular, with disperse media incorporating the atmospheric aerosol. Upgrading systems of optical information transfer and processing aimed at increasing their operation speed and compactness of optical elements makes urgent a study of femtosecond radiation interaction with such objects as microfibers and dielectric microresonators that can serve as miniature emitters or frequency converters [3,4].It should be emphasized that the above-mentioned objects -disperse media -exposed to femtosecond radiation are specific physical systems. Their specifics are that spherical particles have focusing properties and form high-Q microresonators in which morphological resonances or modes of whispering gallery are realized [5]. This results in a sharp increase in the intensity of acting optical fields in the particle volume and, as a consequence, in reduced power thresholds of nonlinear optical processes proceeding in particles. In spite of the fact that optical processes in spherical particles and drops have been investigated already during a quarter of the century, only few works study the interaction of multiphoton femtosecond radiation with the aerosol and liquid-drop substance.The present paper is aimed at studying fluorescence of drops with an organic dye excited due to the multiphoton absorption of femtosecond laser pulses.A titanium-sapphire laser generating pulses at the wavelength λ = 0.8 µm with duration t p = 80 fs and 9 ns and energy per pulse <17 mJ served as a source of femtosecond radiation [6]. The width of the radiation spectrum for nano-and femtosecond pulses at half-maximum was ~25 nm. The intensity distribution over the beam cross-section was close to Gaussian. The femtosecond pulse energy was controlled by registration of radiation in the reference channel with the help of a calibrated photodiode.Unfocused femtosecond radiation was directed onto a drop with the Rhodamin 6G dye in ethanol. The drop ...

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Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses

et al. 2005

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Kopylova

Samsonova

Zemlyanov

et al. 2002

Russian Physics Journal

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Multi-dipolar plasmas for uniform processing: physics, design and performance

Lacoste

Lagarde

Béchu

et al. 2002

Plasma Sources Sci. Technol.

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The scaling up of conventional distributed electron cyclotron resonance plasmas presents limitations in terms of plasma density, limited to the critical density, and of uniformity, due to the difficulty of achieving constant amplitude standing wave patterns along linear microwave applicators in the metre range. The alternative solution presented in this study is the extension of the concept of distribution from one-to two-dimensional networks of elementary plasma sources sustained at electron cyclotron resonance (ECR). With the so-called multi-dipolar plasmas, large size and uniform low-pressure plasmas are produced from a two-dimensional network of elementary, independent plasma sources sustained at ECR. Each elementary plasma source consists of a permanent magnet on which microwaves are applied via an independent coaxial line. The plasma is produced by the electrons accelerated at ECR and trapped in the dipolar magnetic field of the magnet acting as a tri-dimensional magnetron structure. Large-size uniform plasmas can be obtained by assembling as many such elementary plasma sources as necessary, without any physical or technical limitations. Examples of two-dimensional networks are described and the performances in terms of density and uniformity of such plasma sources are presented. The interesting characteristics and advantages of multi-dipolar plasmas over distributed ECR plasmas are listed and the perspectives for plasma processing emphasized.

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Spectral and temporal characteristics of fluorescence of drops comprising dissolved dye excited by the IR laser radiation

Cited by 3 publications

References 4 publications

Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses

Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses

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Multi-dipolar plasmas for uniform processing: physics, design and performance

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