Research on Injection-seeded β-BaB_2O_4 Optical Parameteric Oscillator

ＲｅｓｅａｒｃｈｏｎＩｎｊｅｃｔｉｏｎ┐ｓｅｅｄｅｄβ┐ＢａＢ２Ｏ４ＯｐｔｉｃａｌＰａｒａｍｅｔｅｒｉｃＯｓｃｉｌａｔｏｒＺＨＡＯＹｏｎｇｈｕａＨＥＨｕｉｊｉｕａｎＷＡＮＧＺｈｉｊｉａｎｇ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉ...     

Characterization of Annealed, Proton Exchange Optical Waveguides in Y-cut MgO∶LiNbO_3 Crystal

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　ＩｔｗａｓｓｈｏｗｎｔｈａｔＬｉＮｂＯ3ｄｏｐｅｄｗｉｔｈ5ｍｏｌ%ｏｒｍｏｒｅＭｇＯｉｓｃｈａｒａｃｔｅｒｉｚｅｄｂｙｈｉｇｈｄａｍａｇｅｔｈｒｅｓｈｏｌｄ[1]ｃｏｍｐａｒｅｄｗｉｔｈｕｎｄｏｐｅｄＬｉＮｂＯ3.ＭｇＯ∶ＬｉＮｂＯ3ｗａｖｅｇｕｉｄｅｃａｎｂｅｆａｂｒｉｃａｔｅｄｂｙｐｒｏｔｏｎｅｘｃｈａｎｇｅ[2],ｗｈｉｃｈｉｓｓｉｍｉｌａｒｔｏｔｈｅｍａｔｕｒｅａｎｎｅａｌｅｄｐｒｏｔｏｎｅｘｃｈａｎｇｅ(ＡＰＥ)ｔｅｃｈｎｏｌｏｇｙｏｆＬｉＮｂＯ3.Ｔｈｅｒｅｈａｓｂｅ…     

Internal Optical Parametric Oscillator with SBS Phase Conjugate Resonator

Ｂｅｃａｕｓｅｔｈｅｏｐｔｉｃａｌｐａｒａｍｅｔｒｉｃｏｓｃｉｌｌａｔｏｒ（ＯＰＯ）ｃａｎｂｅｇｅｎｅｒａｔｅｔｈｅｔｕｎａｂｌｅｌａｓｅｒｏｕｔｐｕｔ,ｉｔｐｌａｙｓａｎｉｍｐｏｒｔａｎｔｒｏｌｅｉｎｌａｓｅｒｔｅｃｈｎｏｌｏｇｙ［１～５］．ＩｔｉｓｗｅｌｌｋｎｏｗｎｔｈａｔｔｈｅｅｆｆｉｃｉｅｎｃｙｏｆＯＰＯｄｅｐｅｎｄｓｏｎｔｈｅｑｕａｌｉｔｙｏｆｔｈｅｐｕｍｐｉｎｇｌａｓｅｒｂｅａｍ．ＴｈｅｓｔｉｍｕｌａｔｅｄＢｒｉｌｌｏｕｉｎｓｃａｔｔｅｒｉｎｇ（ＳＢＳ）ｉｓａｎｉｍｐｏｒｔａｎｔｔｏ…     

A Novel OADM Based on Fiber Gratings

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｏｐｔｉｃａｌａｄｄ/ｄｒｏｐｍｕｌｔｉｐｌｅｘｅｒ (ＯＡＤＭ)ｉｓｔｈｅｋｅｙｃｏｍｐｏｎｅｎｔｏｆｏｐｔｉｃａｌｔｒａｎｓｐｏｒｔｎｅｔｗｏｒｋｓ(ＯＴＮ) .ＭａｎｙＯＡＤＭａｒｃｈｉｔｅｃｔｕｒｅｓｈａｖｅｂｅｅｎｒｅｐｏｒｔｅｄ ,ｓｕｃｈａｓｔｈｏｓｅｂａｓｅｄｏｎｗａｖｅｌｅｎｇｔｈｍｕｌｔｉｐｌｅｘｅｒｓ,ａｒｒａｙｅｄｗａｖｅｇｕｉｄｇｒａｔｉｎｇｓ(ＡＷＧ ) ,ａｃｏｕｓｔｏ ｏｐｔｉｃｔｕｎａｂｌｅｆｉｌｔｅｒｓ (ＡＯＴＦ) ,ｆｉｂｅｒＢｒａｇｇ ｇｒａｔｉ…     

Effect of gas pressure on ionization of ambient gas

1　ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｗａｓｏｆｔｅｎｅｎｃｏｕｎｔｅｒｅｄｔｈａｔｉｏｎｉｚａｔｉｏｎｏｆａｍｂｉｅｎｔ ｇａｓｓｈｏｕｌｄｏｃｃｕｒｒｅｄｗｈｅｎａ ｐｌａｓｍａｗａｓｐｒｏｄｕｃｅｄｗｉｔｈｌａｓｅｒａｂｌａｔｉｎｇａｔａｒｇｅｔ .Ｍａｎｙａ     

Collision of Bare Ion Si~(14 ) with the Same Z Slow-atom Si

1　ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｈｉｓｐａｐｅｒｗｅｄｉｓｃｕｓｓｔｈｅｃｏｌｌｉｓｉｏｎｏｆｂａｒｅｉｏｎＳｉ14 ｗｉｔｈｔｈｅｓａｍｅＺｓｌｏｗａｔｏｍＳｉ.Ｉｎｒｅｃｅｎｔｐｕｂｌｉｃａｔｉｏｎｂａｒｅｈｉｇｈ-Ｚｉｏｎｓｃｏｌｌｉｓｉｏｎｗｉｔ...     

Nonlinear elastic waves in a monatomic chain with nonlinear interaction

1　ＩＮＴＲＯＤＵＣＴＩＯＮＢｅｃａｕｓｅｓｏｍｅｉｍｐｏｒｔａｎｔ ｐｒｏｐｅｒｔｉｅｓｏｆｃｒｙｓｔａｌ(ｓｕｃｈａｓｓｐｅｃｉｆｉｃｈｅａｔａｔｈｉｇｈｔｅｍｐｅｒａｔｕｒｅ ,ｍｅｌｔｉｎｇ ,ｔｈｅｒｍａｌｅｘｐａｎｓｉｏｎ ,ｔｅｍｐｅｒａｔｕｒｅｄｅ     

Realizing 20 Gbits OTDM Transmission over 50km Truewave Fiber with Dispersion Compensation

Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｔｈｅｒｅａｒｅｔｗｏｍｅｔｈｏｄｓｔｏｅｎｈａｎｃｅｔｈｅｃａｐａｃｉｔｙｏｆｔｈｅｔｒａｎｓｍｉｓｓｉｏｎｓｙｓｔｅｍ：ｏｐｔｉｃａｌｔｉｍｅｄｉｖｉｓｉｏｎｍｕｌｔｉｐｌｅｘｉｎｇ（ＯＴＤＭ）ａｎｄｏｐｔｉｃａｌｗａｖｅｌｅｎｇｔｈｄｉｖｉｓｉｏｎｍｕｌｔｉｐｌｅｘｉｎｇ（ＷＤＭ）．ＯＴＤＭｉｓｂｅｉｎｇｗｉｄｅｌｙｒｅｓｅａｒｃｈｅｄｂｅｃａｕｓｅｏｆｓｏｍｅｖｉｒｔｕｅｓｉｎｏｐｔｉｃａｌｎｅｔｗｏｒｋｓ［１～４］．ＯＴＤＭｗｉｔｈｔｈｅｓｉｎｇｌｅｃｈａｎ…     

Compact Optical Omega Network

ＣｏｍｐａｃｔＯｐｔｉｃａｌＯｍｅｇａＮｅｔｗｏｒｋ￥ＷＡＮＧＮｉｎｇ；ＹＩＮＹａｏａｌ；ＱＩＡＮＪｉａｊｕｎ；ＬＩＵＬｉｒｅｎ（ＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＯｐｔｉｃｓａｎｄＦｉｎｅＭｅｃｈａｎｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｐ．Ｏ...     

Femtosecond soliton generation induced by intrapulse stimulated Raman scattering in optical fibers

ＦｅｍｔｏｓｅｃｏｎｄｓｏｌｉｔｏｎｇｅｎｅｒａｔｉｏｎｉｎｄｕｃｅｄｂｙｉｎｔｒａｐｕｌｓｅｓｔｉｍｕｌａｔｅｄＲａｍａｎｓｃａｔｔｅｒｉｎｇｉｎｏｐｔｉｃａｌｆｉｂｅｒｓＣＡＯＷｅｎｈｕａ；ＬＩＡＯＣｈａｎｇｊｕｎ；ＧＵＯＱｉ；ＺＨＡＮＧＹｏｕ；...     

Mobile high resolution xenon nuclear magnetic resonance spectroscopy in the earth's magnetic field

Conventional high resolution nuclear magnetic resonance (NMR) spectra are usually measured in homogeneous, high magnetic fields (>1 T), which are produced by expensive and immobile superconducting magnets. We show that chemically resolved xenon (Xe) NMR spectroscopy of liquid samples can be measured in the Earth's magnetic field (5 x 10(-5) T) with a continuous flow of hyperpolarized Xe gas. It was found that the measured normalized Xe frequency shifts are significantly modified by the Xe polarization density, which causes different dipolar magnetic fields in the liquid and in the gas phases.     

Measurement of thermal diffusivity by magnetic resonance imaging

Nuclear magnetic resonance (NMR) may be used for monitoring temperature changes within samples based on measurements of relaxation times, the diffusion coefficient of liquids, proton resonance frequency or phase shifts. Such methods may be extended to the explicit measurement of the thermal diffusivity of materials by NMR imaging. A method based on measuring nuclear spin phase shifts or changes in the equilibrium nuclear magnetization has been developed for measuring transient thermal diffusion effects and thermal diffusivity with potential applications in NMR thermotherapy and materials science. In this method, a thermal pulse is applied to a medium, and the resultant temporal variations of the nuclear spin phase or of the magnitude of the nuclear magnetization produced by the thermal pulse are monitored at a spatial distance. The results obtained on common fluids agree well with the data from other methods.     

The Frequency Shifts of the Nuclear Magnetic Momenta Larmor Precession in the Mixture of Two Noble Gases

The dynamics of nuclear magnetization in the mixture of two noble gases with different gyromagnetic ratios of the nuclei is studied theoretically. The nuclear magnetization is induced by the radiofrequency electromagnetic radiation, which causes the nuclear magnetic resonance in both types of noble gases in the mixture. Frequency shifts of the nuclear magnetic resonance appeared due to an interaction between different types of the noble gases is analytically predicted. The specifics of these shifts are such that they cannot be compensated by means of the external magnetic field. The nature of the magnetic field distortion in the cell caused by the nuclear magnetization is also discussed.     

Shielding and spin-spin coupling constants from gas-phase NMR

Intermolecular interactions modify nuclear magnetic resonance (NMR) chemical shifts and spin-spin coupling constants. The intermolecular effects can be determined if the NMR parameters for an isolated molecule are known. Gas-phase NMR spectroscopy offers such methods which allow one to measure the shielding and spin-spin coupling constants at the zero-density limit where the NMR parameters are free from intermolecular contributions. It is also shown that at present the multinuclear NMR spectra can easily be obtained for gaseous samples containing several micrograms of a solute compound.     

Realization of a decoherence-free subspace using multiple quantum coherences

This Letter presents a two-dimensional nuclear magnetic resonance (NMR) approach for constructing a two-logical-qubit decoherence-free subspace (DFS) by using four multiple-quantum coherences of a CH3 spin system as logical qubits. The three protons in this spin system are magnetically equivalent and can only be used as a single qubit in one-dimensional NMR. We have experimentally demonstrated that our DFS can protect against more types of decoherences than those of the one composed of four noisy physical qubits all with different chemical shifts. This idea may provide new insights into extending qubit systems in the sense that it effectively utilizes the magnetically equivalent nuclei.     

A Quantum-Chemical Investigation of the Geometry and NMR Chemical Shifts of Bilirubin

A computational investigation using density-functional-theory methods has been performed concerning the structure and nuclear magnetic resonance (NMR) chemical shifts of bilirubin with a special emphasis on the hydrogen bonds. Solid-state effects on the NMR spectra are investigated by considering a trimeric model derived from the available X-ray structure. Satisfactory agreement between theory and experiment is found with ring-current effects playing only a minor role for the interpretation of the solid-state NMR spectra. Authors' address: Jürgen Gauss, Institut für Physikalische Chemie, Universit?t Mainz, 55099 Mainz, Germany     

七叶亭及其衍生物的NMR研究

七叶亭衍生物含有药效性较高的苯二酚基团,具有各种生物活性.本文以七叶亭（化合物1）为母体,通过将苯基引入到4位、将甲氧基与羟基分别引入到5、6、7和8位,得到一系列七叶亭衍生物2~14.首先以七叶亭为例,以DMSO-d₆作为溶剂,采集了它的多种核磁共振（NMR）谱图（包括¹H NMR、¹³C NMR、¹H-¹³C HSQC、¹H-¹³C HMBC）,并进行了较详细的化学位移归属;然后对七叶亭衍生物2~14的¹H和¹³C NMR进行了全归属;另外,讨论了取代基变化对七叶亭及其衍生物上的¹H和¹³C NMR化学位移的影响;最后,使用GIAO和CSGT两种量子化学计算方法计算了七叶亭及其衍生物上的¹H和¹³C NMR化学位移,并与它们的实测值做了比较.     

Using liquid and solid state NMR and photoluminescence to study the synthesis and solubility properties of amine capped silicon nanoparticles

Water soluble silicon nanoparticles were prepared by the reaction of bromine terminated silicon nanoparticles with 3-(dimethylamino)propyl lithium and characterized with liquid and solid state nuclear magnetic resonance (NMR) and photoluminescence (PL) spectroscopies. The surface site dependent 29Si chemical shifts and the nuclear spin relaxation rates from an assortment of 1H-29Si heteronuclear solid state NMR experiments for the amine coated reaction product are consistent with both the 1H and 13C liquid state NMR results and routine transmission electron microscopy, ultra-violet/visible, and Fourier transform infrared measurements. PL was used to demonstrate the pH dependent solubility properties of the amine passivated silicon nanoparticles.     

NMR strategies to study the local magnetic properties of carbon nanotubes

The local magnetic properties of the one dimensional inner space of the nanotubes are investigated using ¹³C nuclear magnetic resonance spectroscopy of encapsulated fullerene molecules inside single walled carbon nanotubes. Isotope engineering and magnetically purified nanotubes have been advantageously used on our study to discriminate between the different diamagnetic and paramagnetic shifts of the resonances. Ring currents originating from the π electrons circulating on the nanotube, are found to actively screen the applied magnetic field by −36.9 ppm. Defects and holes in the nanotube walls cancel this screening locally. What is interesting, that at high magnetic fields, the modifications of the NMR resonances of the molecules from free to encapsulated can be exploited to determine some structural characteristics of the surrounding nanotubes, never observed experimentally.     

Erratum to: Hydrodynamic dispersion in β-lactoglobulin gels measured by PGSE NMR

The displacement scale dependent molecular dynamics of solvent water molecules flowing through β-lactoglobulin gels are measured by pulse gradient spin echo (PGSE) nuclear magnetic resonance (NMR). Gels formed under different p H conditions generate structures which are characterized by magnetic resonance imaging (MRI) and PGSE NMR measured dynamics as homogeneous and heterogeneous. The data presented clearly demonstrate the applicability of the theoretical framework for modeling hydrodynamic dispersion to the analysis of protein gels.