The polymer-salt method was applied to synthesize nanoscale Gd2O3:Nd3+ phosphors in the form of thin films on the inner surfaces of capillaries which organize the structure of a silica hollow-core anti-resonant optical fiber. To obtain luminescing centers, the preform of a hollow-core anti-resonant optical fiber was impregnated with a homogeneous mixture of Gd(NO3)3 and NdCl3 dissolved in water and organic solvent (polyvinylpyrrolidone). This procedure was followed by a few post-processing steps, including drying of the impregnated preform in normal conditions and its thermal treatment at temperature 1000 °C. As a result, Gd2O3:Nd3+-based thin films were produced inside the capillaries. Finally, the modified preform was drawn into the hollow-core anti-resonant optical fiber of 120 μm in diameter at temperature 1850 °C. The analysis of crystallographic structure of the initial Gd2O3:Nd3+ nanopowder and the same nanophosphor inside the fabricated fiber revealed the absence of structural and phase transformations of synthesized nanocrystals with an average size 35 nm after drawing. The data on spectral-luminescent properties of the fabricated fiber confirmed the presence of Gd2O3:Nd3+ nanophosphors in silica glass with the main emission peak at wavelength 1064 nm. Presented method of modifying the structure of a hollow-core anti-resonant optical fiber allows formation of active silica layers without using technologically complicated and expensive CVD processes.
In this work spectroscopic and laser characteristic of photo-thermo-refractive (PTR) glasses doped with different concentrations of rare-earth ions (ytterbium-erbium and Neodymium) were comprehensively carried out. Spectroscopic parameters were obtained using some theoretical techniques like Judd-Ofelt theory and Fuchtbauer-Landenburg (F-L) theory. Results show that the optimal concentration of neodymium oxide in PTR is 0.5 mol%, at which the glass demonstrates the best spectral characteristics. It was found that PTR glass doped with 0.1 mol% of erbium oxide and codoped with 2 mol% of ytterbium oxide also shows good spectral-luminescent properties. Laser action on those two samples was demonstrated. optical losses were found to be 0.34 % for neodymium- doped PTR active element and 0.28 % in the case of erbium and ytterbium co-doped active element. These values are quite low and compared to that obtained in commercial laser glasses. It was concluded that the rare-earth ions doped PTR glass isIn this work spectroscopic and laser characteristic of photo-thermo-refractive (PTR) glasses doped with different concentrations of rare-earth ions (ytterbium-erbium and Neodymium) were comprehensively carried out. Spectroscopic parameters were obtained using some theoretical techniques like Judd-Ofelt theory and Fuchtbauer-Landenburg (F-L) theory. Results show that the optimal concentration of neodymium oxide in PTR is 0.5 mol%, at which the glass demonstrates the best spectral characteristics. It was found that PTR glass doped with 0.1 mol% of erbium oxide and codoped with 2 mol% of ytterbium oxide also shows good spectral-luminescent properties. Laser action on those two samples was demonstrated. optical losses were found to be 0.34 % for neodymium- doped PTR active element and 0.28 % in the case of erbium and ytterbium co-doped active element. These values are quite low and compared to that obtained in commercial laser glasses. It was concluded that the rare-earth ions doped PTR glass is a promising material that can be a good candidate for producing the DFB lasers. a promising material that can be a good candidate for producing the DFB lasers.
Spectral methods for the detection and analysis of ionizing radiation sources are widely used in many fields of science and technology. Ecology, geology and mineralogy, metallurgy and the chemical industry, the oil industry and medicine - this is not the whole list of areas where the gamma-ray spectrometer acts as an independent software and hardware tool. Scintillation spectrometers are used to monitor the radiation environment, to search for sources of ionizing radiation, tomography and much more. However, this method is based on the use of vacuum photoelectronic multipliers (PMTs), which complicates the use of devices in the field. This article presents an analysis of gamma-ray scintillation spectrometers built on the basis of silicon photoelectronic multipliers (SiPM). The fields of application of field gamma spectrometers are considered and the basic requirements that the devices must meet to ensure the successful solution of the tasks are determined. The basic principles of the development of field scintillation gamma spectrometers that take into account the processes and transformations of the optical range radiation inside the detector are described. Moreover, the article describes personal experience in the development of an experimental sample of a field gamma spectrometer based on SiPM. In this article, the use of field device refers to any use outside of laboratory conditions.
The paper describes the polymer-salt method of neodymium-doped aluminum yttrium garnet (YAG:Nd) crystals formation inside the channels of a microstructured silica fiber preform. The crystals formation was performed through the impregnation of inner surfaces of the channels by aqueous solutions of thermally decomposable salts (yttrium nitrate, aluminum nitrate, neodymium chloride) and an organic polymer with subsequent processes of drying and thermal treatment at the temperature of 1100°C. The composite structure prepared was drawn into the fiber at the temperature of 2000°C. The X-ray diffraction analysis revealed the formation of YAG:Nd crystals from 25 nm to 37 nm in size in the silica glass matrix of the fiber. Measurement of the attenuation spectral dependence confirmed the presence of optical signal absorption bands inherent to Nd3+ ions. The shape of the nanocrystals luminescence spectrum is characteristic to the YAG:Nd with a peak at the wavelength of 1064 nm.
Mixed-alkali-alumina-borate glasses doped with different Cr2O3 content are prepared by conventional melt-quenching technique. Luminescent glass-ceramics is derived by volume crystallization of the precursor glass via two-stage heat treatment. The structural, spectral, and luminescent properties of the glass-ceramics are determined by X-ray diffraction, optical absorption, and photoluminescent spectroscopy. The XRD studies reveal the LiAl7B4O17: Cr3+ nanocrystals nucleation during the heat treatment. The photoluminescence spectra consist of three intense bands in the 685 – 715 nm region. The features and background of the complex concentration dependence of the luminescence lifetime are discussed. The maximum quantum yield value under 532 nm excitation is 41%.
First step of Er-Yb laser based on PTR glass creation was made. Complex study of luminescent characteristics of PTR glass doped with Er-Yb with recorded holograms was made. Direct measurements of population inversion of main Erbium level 4I13/2 for different Erbium concentrations and pumping power was made. Was shown that spectral and luminescent characteristics of poly-functional PTR glass doped with Er-Yb and recorded holograms are comparable to the traditional laser barium phosphate glass.
Two types of lead-fluoride nano-glassceramics doped with rare-earth ions (Tm, Ho, Pr, Er, Yb) have been developed and
synthesized. The size of crystalline phase achieved up to 40 nm. Spectral and luminescence properties of nanoglassceramics
have been investigated. It was shown, that emitting probabilities of different transitions changed during
thermal treatment. The entry of rare-earth ions in crystalline phase resulted in a broadening of emission spectra. For
example, the bandwidth of emission spectrum at 1.55 mkm achieves 70 nm for Er-doped nano-glassceramics. RE-doped
nano-glassceramics are promising candidates for different photonics applications, sensors, fiber and waveguide lasers.
Gain/loss spectra in ytterbium-erbium doped bulk glass samples have been investigated within spectral range of 1.5 μm. Experimental methods for determination of the population of excited metastable level, gain/loss spectra, and their variations versus pump power have been developed. A comparison of the experimental and calculated gain/loss spectra has been done.
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