High-energy single pulse and multi-spike operation with a passive polymer Q-switch

Безродный, В. И.; Ishchenko, A. A.

doi:10.1016/s0030-3992(01)00080-9

Cited by 30 publications

(15 citation statements)

References 3 publications

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“…In [155][156][157] B(Ph) 3 Bu -was used as such an anion. After photoexcitation electron transfer from the anion to the cation (Ct + ) occurs with the formation of two neutral radicals -Ct ⋅ and B(Ph) 3 Bu ⋅ . The latter dissociates according to the scheme…”

Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

“…Criteria for the creation of lightfast dyed matrices are formulated. Special attention is directed to contemporary light-sensitive materials in which the dye is covalently bonded to the polymer and to organic-inorganic compositions based on them.Dyed polymers are widely used in laser technology [1][2][3][4][5], media for writing and recording data [6-8], solar power [9][10][11][12], and optoelectronics [12][13][14][15]. Such polymeric materials have a series of operational advantages over dyed liquid materials on account of their more simple and more convenient construction, non-toxicity, and the possibility of working over a wide temperature range (from minus to plus temperatures) and under conditions of weightlessness.…”

mentioning

confidence: 99%

“…In real devices decrease of the thermal effects is sometimes achieved by special technical solutions, e.g., the construction of sandwich structures [2,3]. The latter are a dyed layer of polymer between two optical glasses, which remove heat from the irradiation zone.…”

mentioning

confidence: 99%

“…It is possible to increase the removal of heat by using substrates with higher thermal conductivity than glass, e.g., from sapphire. The heat removal can be further increased by using more complex polyplex constructions (multilayer sandwich structures) instead of triplexes [2,3]. Such technical processes made it possible to use polymeric passive shutters on dyes in solid-state lasers operating in a pulsed-periodic regime with frequencies up to 100 Hz, in which significant thermal effects arise in the working zone of irradiation [3].…”

mentioning

confidence: 99%

“…The heat removal can be further increased by using more complex polyplex constructions (multilayer sandwich structures) instead of triplexes [2,3]. Such technical processes made it possible to use polymeric passive shutters on dyes in solid-state lasers operating in a pulsed-periodic regime with frequencies up to 100 Hz, in which significant thermal effects arise in the working zone of irradiation [3]. The situation can be further improved by making devices capable of rotating about an axis or moving the polymeric samples progressively since this gives the possibility of quickly changing the irradiation working zone [20].…”

mentioning

confidence: 99%

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Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

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The main factors affecting the degradation of dyed polymeric matrices by the action of light (conversion of light energy into thermal energy, electron phototransfer, population of triplets, aggregation of dyes, oxidation-reduction processes, interaction with oxygen, including singlet) are analyzed and classified. Their dependence on the structure of the dyes, the nature of the polymer, and the method of dyeing of the latter is examined. Criteria for the creation of lightfast dyed matrices are formulated. Special attention is directed to contemporary light-sensitive materials in which the dye is covalently bonded to the polymer and to organic-inorganic compositions based on them.Dyed polymers are widely used in laser technology [1][2][3][4][5], media for writing and recording data [6-8], solar power [9][10][11][12], and optoelectronics [12][13][14][15]. Such polymeric materials have a series of operational advantages over dyed liquid materials on account of their more simple and more convenient construction, non-toxicity, and the possibility of working over a wide temperature range (from minus to plus temperatures) and under conditions of weightlessness. However, these advantages can only be realized to the full extent in the solution of various applied problems if dyed matrices with sufficient stability to the action of light are created. The aim of the present review was therefore to analyze, classify, and generalize methods of creating such matrices. FACTORS GIVING RISE TO THE DEGRADATION OF DYED POLYMERS DURING THE ACTION OF LIGHTThe presence of absorbing microimpurities that are heated by radiation are responsible for the radiation damage of optically transparent polymers. Purification from such inclusions at the monomer stage leads to a substantial increase in the threshold of radiation damage in the obtained polymer. For instance, the purification of methylmethacrylate (MMA) by repeated slow distillation raises this threshold of polymethylmethacrylate (PMMA) from several times [16] to two orders of magnitude [17]. 0040-5760/09/4503-0143

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Section: Methods Of Introduction Of Dyes Into the Polymer And Their Cmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Ishchenko

Grabchuk

2009

Theor Exp Chem

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Molecular engineering of dye‐doped polymers for optoelectronics

Ishchenko

2002

Polymers for Advanced Techs

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The main approaches to molecular engineering of prospective dye‐doped polymer matrices for optoelectronics have been considered. The advantages of such matrices over polymers and dyes separately were analyzed. It was shown that these advantages can be realized in the case where a doping of polymers by low‐molecular‐weight dyed impurities does not essentially distort spectral, luminescent and nonlinear optical properties of the individual components of polymer composition. The influence of polymer nature and chemical constitution of organic dyes on photophysical and photochemical properties of these matrices was analyzed. Processes of dye aggregation in polymers were characterized. Their influence on photophysical properties and the photochemical stability of dye‐doped materials was discussed. The different approaches for struggle with it is offered. The influence of the method of introduction of a dye into a polymer on the output parameters of dyed materials was considered. The main paths of energy degradation of electronic excitation in such materials – internal conversion, electron transfer and photoisomerization – were analyzed. The role of dyes in the process of generation, in recombination and in the carriage of charges in photoconductive polymers was discussed. The prospects for the application of dye‐doped polymer materials as passive Q‐switches of solid‐state lasers, as active laser media with large Stokes shift, as luminescent solar converters and as electroluminescent emitters were demonstrated. Copyright © 2003 John Wiley & Sons, Ltd.

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Design and Photonics of Merocyanine Dyes

Kulinich,

Ishchenko

2023

The Chemical Record

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Merocyanines, thanks to their easily adjustable electronic structure, appear to be the most versatile and promising functional dyes. Their D–π–A framework offers ample opportunities for custom design through variations in both donor/acceptor end‐groups and the π‐conjugated polymethine chain, and leads to a broad range of practical properties, including noticeable solvatochromism, high polarizability/hyperpolarizabilities, and the ability to sensitize various physicochemical processes. Accordingly, merocyanines are applied and extensively studied in various fields, such as light‐converting materials for optoelectronics, nonlinear optics, optical storage, solar cells, fluorescent probes, and antitumor agents in photodynamic therapy. This review encompasses both classical and novel more important publications on the structure–property relationships in merocyanines, with particular emphasis on the results by A. I. Kiprianov and his followers in Institute of Organic Chemistry in Kyiv, Ukraine.

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High-energy single pulse and multi-spike operation with a passive polymer Q-switch

Cited by 30 publications

References 3 publications

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Physical and chemical problems of the creation of photostable converters of light energy on the basis of dyed polymers

Molecular engineering of dye‐doped polymers for optoelectronics

Design and Photonics of Merocyanine Dyes

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