Chinese Academy of Sciences

Beihang University

Chunxi Zhang

Ningfang Song

Changhui Chen

Jingming Song

Yan Li

Jing Jin

Wei Cai

Zhiyu Guo

Zuchen Zhang

Weile Li

An anti-torsion solid-core polarization-maintaining photonic crystal fiber includes a cladding having an inner layer arranged around the core and an outer layer between the inner layer and the outer wall of the cladding. The inner layer has multi-layer air holes used to construct optical properties and two micron-size air holes arranged along the x-axis extending in the center producing form birefringence. The outer layer includes multi-layer air holes arranged radially along the y-axis. The size and arrangement of the multi-layer air holes in the outer layer cause the bending stiffness of the photonic crystal fiber along the x-axis to be different from that along the y-axis. While meeting the requirements of the optical properties of the fiber, the photonic crystal fiber possesses an anti-torsion ability due to the anisotropy of stress distribution in the radial direction, thereby reducing the non-reciprocal phase difference generated by the magneto-optic Faraday Effect.

Anti-torsion solid-core polarization-maintaining photonic crystal fiber based on anisotropy of stress distribution

[MnSrO] cluster compounds are synthesized in a single step from raw materials consisting of simple and inexpensive Mn, Srinorganic compounds and carboxylic acids by using permanganate anion as oxidant. This step can be followed by the synthesis of asymmetric biomimetic water splitting catalyst [MnSrO] cluster compounds in the presence of water. The [MnSrO] cluster compound can catalyze the splitting of water in the presence of an oxidant to release oxygen gas. The neutral [MnSrO](RCO)6(RCOH)cluster compound can serve as precursors for the synthesis of biomimetic water splitting catalysts, and can be utilized in the synthesis of different types of biomimetic water splitting catalysts. [MnSrO](RCO)(L)(L)(L)(L) cluster compounds can serve as artificial water splitting catalysts, can be utilized on the surface of an electrode or in the catalyzed splitting of water driven by an anoxidant.

Cluster compounds containing [MnSrO] and [MnSrO] core structures, preparation method and application thereof

The present invention provides a process for preparing a water splitting catalyst containing [MnCaO] core structure and use thereof. The present invention provides clusters containing [MnCaO] core structure by a chemical synthesis using inexpensive metal ions (Mn, Caions), simple carboxyl ligands and a permanganate, performed single crystal X-ray diffraction on their space structure, and characterized their physical and chemical properties with electron spectrum, electrochemical and electron paramagnetic resonance technologies and the like. These compounds can catalyze water splitting in the presence of oxidant to release oxygen and can also catalyze water splitting on the surface of an electrode to release electrons onto the surface of the electrode to form a current.

Water splitting catalyst containing MnCaOcore structure, preparation process and application thereof

The low magnetic sensitivity PM-PCF based on mechanical buffer is obtained by adding buffer structures in the cladding layer of the photonic crystal fiber. In the center of the fiber, the core region contains at least 3 layers of air-holes, enclosed by the cladding layer. The buffer structures are placed in the cladding layer. These buffer structures are formed by replacing silica of any shape by air, and are symmetrically located in X-axis and Y-axis directions to achieve mechanical isotropy. The buffer structures improve the fiber's performance in fiber coiling and stress conditions. Therefore, the fiber optic gyroscope using the PM-PCF can do without a magnetic shield, thus greatly reducing the weight of the fiber optic gyroscope and extending the scope of its application. Compared with the conventional commercial PCF, the PM-PCF provides the fiber optic gyroscope with lower temperature sensitivity and improved accuracy.

Kind of low magnetic sensitivity PM-PCF based on mechanical buffer

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Beijing, China

Chunxi Zhang