New efficient dyes for the red part of the lasing spectrum

Маслов, В. А.; Dzyubenko, M. I.; Kovalenko, Sergiy M.; Nikitchenko, V. M.; Novikov, A. I.

doi:10.1070/qe1987v017n08abeh009625

Cited by 8 publications

(3 citation statements)

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“…The observed effect seems to be caused by protonation of nitrogen in the 7th position of benzopyran base of the dyes. It is more noticeable for LD1 in which diethylaminogroup in this position may leave the plane of the molecular skeleton at the protonation, in the issue the probability of S 1 →S 2 radiative transition is sharply diminished [22] and luminescence is quenched. Therefore, while fabricating the active media on the base of silica matrices we added pyridine to reduce the acidity in sol synthesis process.…”

Section: Resultsmentioning

confidence: 98%

“…For fabrication laser media based on SiO 2 matrices for the red and the NIR spectral regions we used laser dyes with high efficiency in alcohol solutions studied early [22,23] and two standard laser dyes: DCM and Rhodamine 800 (Rh800) [24]. The spectral and laser characteristics of these matrices were studied.…”

Section: Methodsmentioning

confidence: 99%

“…The silica gel were synthesized using tetraethoxy-and tetramethoxysilane (TEOS and TMOS respectively; Aldrich), additionally purified ethyl alcohol, formamide (FA) chemically pure, and twice distilled water, as well as laser dyes LD1 and LD2 (synthesized at the V. Karazin Kharkiv National University [22]), LK678 (synthesized at the D. Mendeleev Moscow Chemical Technology University [25]), DCM (Aldrich) and Rh800 (Aldrich). Presented below are the structural formulas of some dyes: SiO 2 matrices were synthesized using sol-gel method by the hydrolysis of TEOS (or TMOS) with addition of nitric acid as a reaction catalyst [26,27].…”

Section: Methodsmentioning

confidence: 99%

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Spectral and Lasing Characteristics of Some Red and Nir Laser Dyes in Silica Matrices

Притула

Bezkrovnaya

Puzikov

et al. 2015

Springer Series in Optical Sciences

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We synthesized a series of sol-gel silica matrices doped with laser dyes DCM, LK678, LD1, and LD2 which alcohol solutions have efficient lasing in the red spectral region and Rh800-in the near infrared (NIR) one. Absorption, fluorescence, and laser properties of the dyes in silica samples prepared by sol-gel process were investigated. It has found some peculiarities in preparation process of the laser matrices and in spectral characteristics of the dyes in these matrices. IntroductionThe lasers tuned in the red and the near infrared (NIR) regions of the spectrum and dyes-sensitizers for this spectral range are widely applied for diagnostics of different biological and medical objects. For instance, an oxazine dye [1] is used for early diagnostics of Alzheimer's disease. The urgency of laser sources for this region is due to the fact that the penetration depth of the radiation into living tissue for them is about a centimeter. Furthermore study of new photosensitizers with the silica coating for photodynamic therapy at infrared excitation [2] necessitates quest of new radiation sources.Dye lasers developed specially may be used for this purpose. However, for many practical applications solid-state dye lasers are the most challenging because of they are not required bulky dye-flow systems, and no toxic and inflammable solvents [3]. Matrices prepared by the sol-gel process, polymeric ones or porous glasses are used in these lasers.

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Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%