Mode-locked diode-pumped vanadate lasers operated with PbS quantum dots

The use of glasses doped with PbS nanocrystals as intracavity saturable absorbers for passive Q-switching and mode locking of c-cut Nd:Gd0.7Y0.3VO4, Nd:YVO4, and Nd:GdVO4 lasers is investigated. Q-switching yields pulses as short as 35 ns with an average output power of 435mW at a repetition rate of 6-12 kHz at a pump power of 5-6W. Mode locking through a combination of PbS nanocrystals and a Kerr lens results in 1.4 ps long pulses with an average output power of 255 mW at a repetition rate of 100 MH

Work experience on automation of processing of survey measurements of backfill of mines of Uralkali PJSC

During the last years of development of Verkhnekamsk potassium salt field (VKPSF) activities that aimed to prevent harmful impact of underground mines on earth's surface and industrial, civil and natural objects located on it and water breakthrough into mines became relevant. One of the main methods to control these phenomena is to backfill empty space with solid wastes of potassium ore processing. Growing volume of backfill works leads to an increase in survey service of mining enterprises, which does instrumental control over fulfillment of design parameters of backfilling mines. In this regard, there are questions raised on automation of processing of results of instrumental measurements of backfill volumes and compiling graphic and text reporting documentation. In order to solve this problem the authors of the article developed a software module that allows to solve in automated mode most of the tasks that are faced by staff of survey departments of VKPSF mines who monitor compliance with design parameters of volume of backfilling operations. The article provides information on functional possibilities and technical architecture of a software module. Examples of interface solutions and information on volumes of reporting documents being created are given. A developed software module is integrated into created mining and geological information system of Uralkali PJSC. A system is created with direct participation of the authors and provides 21 automated workplaces for various mining specialists (miners, geologists, mine surveyors, geophysicists, geomechanics, environmentalists etc.) starting from the primary link in mines and ending with the management of Uralkali PJSC

ESR Study of Y<inf>2</inf>SiO<inf>5</inf>:Nd¹⁴³ Isotopically Pure Impurity Crystals for Quantum Memory

© 2017, Springer-Verlag Wien.Two Y2SiO5 single crystals doped with 0.001 at.% of the 143Nd3+ ion (sample I containing the only 28Si isotope) and (sample II with the natural abundance of silicon isotopes) were studied using magnetic resonance methods. The spin–spin and spin–lattice relaxation times were measured at 9.7 GHz between 4 and 10 K. It is established that three relaxation processes describe temperature dependences of the spin–lattice relaxation for both crystals. They are one-phonon, two-phonon Raman and two-phonon Orbach–Aminov relaxation processes. It is established that temperature dependence of spin–spin relaxation time differs for different hyperfine components of the electron paramagnetic resonance spectrum of neodymium ions and depends on the kind of the neodymium isotope (143Nd or 145Nd)

Investigations of Y<inf>2</inf>SiO<inf>5</inf>: Nd¹⁴³ by ESR method

© 2016 Elsevier B.V.Here we present the investigation of Y2SiO5 monocrystals doped by isotopically pure 143Nd3+(0.025%) impurity by X-ray and electron spin resonance methods. The crystal structure parameters of Y2SiO5 monocrystal and microscopic parameters: g-tensors and hyperfine structure parameters of two nonequivalent Nd3+ paramagnetic centers were determined

Investigations of Y<inf>2</inf>SiO<inf>5</inf>: Nd¹⁴³ by ESR method

© 2016 Elsevier B.V.Here we present the investigation of Y2SiO5 monocrystals doped by isotopically pure 143Nd3+(0.025%) impurity by X-ray and electron spin resonance methods. The crystal structure parameters of Y2SiO5 monocrystal and microscopic parameters: g-tensors and hyperfine structure parameters of two nonequivalent Nd3+ paramagnetic centers were determined