High-resolution magneto-optical spectroscopy of LiYF4 7: Er 3+ 167, Er 3+ 166 and analysis of hyperfine structure of ultranarrow optical transitions

© 2016 American Physical Society.We performed high-resolution magneto-optical spectroscopy of the hyperfine transitions from I15/24 to the I13/24 and I9/24 multiplets of Er3+167 and Er3+166 in an isotopically purified LiYF47 crystal in various external magnetic fields up to 0.7 T. The obtained experimental results are interpreted in the framework of the generalized theoretical approach. The derived model successfully explains all the experimentally observed optical hyperfine transitions by using a single set of basic parameters found for the crystal-field interaction, magnetic dipole and electric quadrupole hyperfine interactions, together with Zeeman interactions at different orientations of the external magnetic field. A number of the studied quantum transitions appears to be promising for use in Raman quantum storage at optical telecommunication wavelengths

High-resolution magneto-optical spectroscopy of LiYF4 7: Er 3+ 167, Er 3+ 166 and analysis of hyperfine structure of ultranarrow optical transitions

© 2016 American Physical Society.We performed high-resolution magneto-optical spectroscopy of the hyperfine transitions from I15/24 to the I13/24 and I9/24 multiplets of Er3+167 and Er3+166 in an isotopically purified LiYF47 crystal in various external magnetic fields up to 0.7 T. The obtained experimental results are interpreted in the framework of the generalized theoretical approach. The derived model successfully explains all the experimentally observed optical hyperfine transitions by using a single set of basic parameters found for the crystal-field interaction, magnetic dipole and electric quadrupole hyperfine interactions, together with Zeeman interactions at different orientations of the external magnetic field. A number of the studied quantum transitions appears to be promising for use in Raman quantum storage at optical telecommunication wavelengths

Model Pemanfaatan Teknologi Informasi Untuk Meningkatkan Transfer Pengetahuan Pada Ukm Handicraft Bali

Transfer pengetahuan dapat terjadi pada berbagai organisasi baik organisasi besar maupun kecil. Salah satu usaha yang didalamnya terdapat proses transfer pengetahuan adalah Usaha Kecil Menengah (UKM). Proses transfer pengetahuan pada UKM khususnya UKM Handicraft terjadi pada proses pembuatan produk. Untuk meningkatkan transfer pengetahuan pada UKM Handicraft diperlukan bantuan Teknologi Informasi (TI). Dengan adanya penerapan TI dalam proses transfer pengetahuan diharapkan dapat menyebarkan pengetahuan dalam anggota UKM. Dengan terbesarnya pengetahuan dalam UKM diharapkan dapat menambah pengetahuan anggota UKM, meningkatkan produktivitas anggota UKM, meningkatkan daya saing dan kepuasaan pelanggan. Penelitian ini dilakukan pada UKM yang bergerak dalam bidang Handicraft yang terletak pada provinsi Bali. Hasil dari penelitian ini berupa model pemanfaatan TI untuk meningkatkan transfer pengetahuan. Pengembangan model bertujuan agar dapat menggambarkan pemanfaatan TI dalam proses transfer pengetahuan pada UKM handicraft Bali. Metode penelitian yang digunakan mengacu pada information system research framework. Metode penelitian terdiri dari tahapan pengkajian literature dan aspek lingkungan, analisis, identifikasi construct, pembangunan model. Hasil penelitian ini adalah berupa model pemanfaatan teknologi informasi untuk meningkatkan transfer pengetahuan. &nbsp

Stationary and coherent spectroscopy of 167

We have conducted a spectroscopic investigation of 167Er3+ ions in optical waveguides on an optical transition between the hyperfine sublevels of 4I15/2 and 4I9/2 multiplets. Waveguides with diameters ranging from 20 to 100 µm were produced in the crystal by a femtosecond laser using the depressed-cladding approach. The spectroscopy results of 167Er3+ ions inside the waveguides show additional broadening and an overall shifts of the spectra compared to the bulk spectrum of ions. The sign of the observed frequency shift depends on the diameter of the specific waveguide. We have also observed a two-pulse photon echo in several waveguides. The acquired results show the possibility for integrated quantum schemes in rare-earth ions doped crystals

Photon echo of an ultranarrow optical transition of ¹⁶⁷Er³⁺ in ⁷LiYF<inf>4</inf> crystals

© 2017 Kvantovaya Elektronika and Turpion Ltd. The longitudinal and transverse relaxation times for a transition between hyperfine sublevels of the lower electronic states of the 4 I 15/2 and 4 I 9/2 multiplets of 167 Er 3+ ions in 7 LiYF 4 crystals have been determined for the first time using two-pulse and stimulated photon echo measurements in zero magnetic field at a temperature of 4 K. The decay of the photon echo signal has been shown to be modulated, which is tentatively attributed to the superhyperfine interaction of the 167 Er 3+ ions with their 19 F- nearest neighbours. The contributions of various types of interaction to the ultranarrow linewidth (~24 MHz) of the transition in question are discussed. Our results demonstrate that this optical transition of the 167 Er 3+ ion in 7 LiYF 4 crystals is potentially attractive for use in Raman quantum memory schemes

Pulse area theorem in a single mode waveguide and its application to photon echo and optical memory in Tm3+:Y3Al5O12

We derive the area theorem for light pulses interacting with inhomogeneously broadened ensemble of two-level atoms in a single-mode optical waveguide and present its analytical solution for Gaussian-type modes, which demonstrates the significant difference from the formation of $2\pi$ pulses by plane waves. We generalize this theorem to the description of photon echo and apply it to the two-pulse (primary) echo and the revival of silenced echo (ROSE) protocol of photon echo quantum memory. For the first time, we implemented ROSE protocol in a single-mode laser-written waveguide made of an optically thin crystal $Tm^{3+}:Y_3Al_5O_{12}$. The experimental data obtained are satisfactorily explained by the developed theory. Finally, we discuss the obtained experimental results and possible applications of the derived pulse area approach

¹³C NMR chemical shifts and local structure of cis-1,4-polybutadiene: Calculation and experiment

© 2016, Pleiades Publishing, Ltd.The quantum-chemical modeling of the local conformational structures of a cis-1,4-polybutadiene macromolecule is performed, and the magnetic shielding constants of 13C nuclei are calculated. The theoretical values of chemical shifts in the 13C NMR spectra are compared with the corresponding experimental data

¹³C NMR chemical shifts and local structure of cis-1,4-polybutadiene: Calculation and experiment

© 2016, Pleiades Publishing, Ltd.The quantum-chemical modeling of the local conformational structures of a cis-1,4-polybutadiene macromolecule is performed, and the magnetic shielding constants of 13C nuclei are calculated. The theoretical values of chemical shifts in the 13C NMR spectra are compared with the corresponding experimental data