Kyropoulos Growth and Characterization of Monoclinic α-Bi2B8O15 Single Crystal with Noncentrosymmetric Structure

Monoclinic bismuth-based borate crystal α-Bi2B8O15 was grown by the Kyropoulos method. High resolution X-ray diffraction analysis showed that the full width at half-maximum of the Y plate was about 0.04°...

Lead-free polar borate crystal K3Nb3B2O12: a novel antiferroelectric structure type

K3Nb3B2O12 is a new lead-free polar AFE crystal, representing a novel AFE structure type.

A new non-centrosymmetric Gd-based borate crystal Rb7SrGd2(B5O10)3: growth, structure, and nonlinear optical and magnetic properties

A new Gd-based multifunctional material, Rb7SrGd2(B5O10)3, demonstrating moderate nonlinear optical response and paramagnetic properties was obtained for the first time.

Investigation of Piezoelectric Ringing Frequency Response of Beta Barium Borate Crystals

The piezoelectric ringing phenomenon in Pockels cells based on the beta barium borate crystals was analyzed in this work. The investigation results show that piezoelectric ringing is caused by multiple high voltage pulses with a frequency in the range from 10 kHz up to 1 MHz. Experimental investigation of frequency response and Discrete Fourier transformation was used for analysis. The method of piezoelectric ringing investigation based on the analysis of difference of real and simulated optical signals spectrums was proposed. The investigations were performed for crystals with 3 × 3 × 25 mm, 4 × 4 × 25 mm and 4 × 4 × 20 mm dimensions. It was estimated that piezoelectric ringing in the beta barium borate crystal with dimensions of 3 × 3 mm × 25 mm occurred at the 150, 205, 445, 600 and 750 kHz frequencies of high voltage pulses.

PREPARATION OF ENTANGLED PAIRS OF PHOTONS IN BARIUM BETA BORATE CRYSTAL

For the last two decades, the focus of scientific research in the field of information transmission and processing has been in such sections of quantum optics as quantum computing and quantum cryptography. These areas of optics rely on the discovery of a special type of radiation - beams with pairs of bound or entangled photons. The experimental work in Russia, devoted to the entangled photons is undeservedly little. Therefore, the proposed work is important from a methodical point of view. Moreover, the experiment is performed on domestic equipment, much cheaper than most foreign analogues. The described system can be used as a prototype for setting up educational demonstration and laboratory works. Therefore, the proposed work will be of interest to researchers and universities involved in quantum optics. As a result of the work done, the attempt to create a source of entangled photons based on a barium beta-borate crystal can be considered successful. It should be added that in a second type of crystal pairs of entangled photons arise not only with respect to directions (and frequencies), but also with respect to two orthogonal polarizations. A similar source makes it possible to set up experiments similar to the Einstein-Podolsky-Rosen thought experience in Bohm’s interpretation. Therefore, it is also suitable for testing the Bell inequality. The article considers the practical importance of the phenomenon of generation of entangled photons for the purposes of quantum cryptography, the phenomenon of spontaneous parametric scattering and the creation of a source of entangled pairs of photons based on it, the experimental system and the results of the experiment on generation of correlated photon pairs, tangled with respect to directions and frequencies, the result of the experiment on observing the correlation in the detection times of pairs of entangled photons.

Photoluminescent carbon dots based on a rare 3D inorganic–organic hybrid cadmium borate crystal

A 3D inorganic–organic hybridized skeleton cadmium borate [Cden][B5O8(OH)] (1) (en = ethylenediamine) has been solvothermally synthesized. By calcining it, specific shape carbon dots (C-dots) with abundant free radicals were observed. In addition, C-dots in the ethanol phase exhibited variable photoluminescence and showed a special effect to Cr3+/Cs+ ions and CdSe/ZnS, CsPbBr3 quantum dots.

High mechanical strength in Zn4B6O13 with an unique sodalite-cage structure

Borate crystal Zn4B6O13 exhibits high mechanical strength, originating from the sodalite-cage structure.