scholarly journals A Faraday Anomalous Dispersion Optical Filter Based on Rubidium Hollow-Cathode Lamp

2020 ◽  
Vol 10 (20) ◽  
pp. 7075
Author(s):  
Liang Shen ◽  
Rui Ma ◽  
Longfei Yin ◽  
Bin Luo ◽  
Duo Pan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hollow Cathode ◽  
Room Temperature ◽  
Saturated Vapor ◽  
Optical Filter ◽  
Optical Filters ◽  
Anomalous Dispersion ◽  
Narrow Linewidth ◽  
Hollow Cathode Lamp ◽  
Lower Temperature

Using a hollow-cathode lamp (HCL) to build a Faraday anomalous dispersion optical filter (FADOF) is a new method to realize narrow linewidth optical filters. In contrast to other atomic optical filters based on saturated vapors, which work at a relatively high temperature to maintain the atomic density, the HCL device using sputtered particles can work at a much lower temperature. In this work, a rubidium HCL-based FADOF (HCL-FADOF) working at 780 nm is established and carefully tested. With 20 mm cathode length, the transmittance can reach 29% under 18 mA discharge current and 260 G magnetic field at room temperature, which is equivalent to the performance of a saturated vapor-based FADOF (VC-FADOF) at more than 60 ∘C. This work provides a direct comparison of the performance of the HCL-FADOF and the VC-FADOF, which is of great benefit to further studies of atomic filters at normal temperature.

scholarly journals Hollow cathode lamp based Faraday anomalous dispersion optical filter

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Duo Pan ◽  
Xiaobo Xue ◽  
Haosen Shang ◽  
Bin Luo ◽  
Jingbiao Chen ◽  
...  
Keyword(s):  
Hollow Cathode ◽  
Optical Filter ◽  
Anomalous Dispersion ◽  
Hollow Cathode Lamp

scholarly journals Giant barocaloric effect in hexagonal Ni2In-type Mn-Co-Ge-In compounds around room temperature

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Rong-Rong Wu ◽  
Li-Fu Bao ◽  
Feng-Xia Hu ◽  
Hui Wu ◽  
Qing-Zhen Huang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Room Temperature ◽  
Superconducting Magnets ◽  
Entropy Change ◽  
Lattice Expansion ◽  
Moderate Pressure ◽  
Gas Compression ◽  
Lower Temperature ◽  
Giant Magnetocaloric Effect ◽  
Magnetostructural Transformation

Abstract The most widespread cooling techniques based on gas compression/expansion encounter environmental problems. Thus, tremendous effort has been dedicated to develop alternative cooling technique and search for solid state materials that show large caloric effects. An application of pressure to a material can cause a change in temperature, which is called the barocaloric effect. Here we report the giant barocaloric effect in a hexagonal Ni2In-type MnCoGe0.99In0.01 compound involving magnetostructural transformation, T mstr, which is accompanied with a big difference in the internal energy due to a great negative lattice expansion(ΔV/V ~ 3.9%). High resolution neutron diffraction experiments reveal that the hydrostatic pressure can push the T mstr to a lower temperature at a rate of 7.7 K/kbar, resulting in a giant barocaloric effect. The entropy change under a moderate pressure of 3 kbar reaches 52 Jkg−1K−1, which exceeds that of most materials, including the reported giant magnetocaloric effect driven by 5 T magnetic field that is available only by superconducting magnets.

Rb 780 nm Faraday anomalous dispersion optical filter in a strong magnetic field

1993 ◽  
Vol 101 (3-4) ◽  
pp. 175-178 ◽  
Author(s):  
Zhilin Hu ◽  
Xianping Sun ◽  
Xizhi Zeng ◽  
Yufeng Peng ◽  
Junxiong Tang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Optical Filter ◽  
Anomalous Dispersion

TEMPORAL BEHAVIOUR OF THE OPTOGALVANIC SIGNAL IN A HOLLOW CATHODE LAMP

1983 ◽  
Vol 44 (C7) ◽  
pp. C7-479-C7-487 ◽  
Author(s):  
M. Broglia ◽  
F. Catoni ◽  
P. Zampetti
Keyword(s):  
Hollow Cathode ◽  
Temporal Behaviour ◽  
Hollow Cathode Lamp

scholarly journals Practical Synthesis of 2-Iodosobenzoic Acid (IBA) without Contamination by Hazardous 2-Iodoxybenzoic Acid (IBX) under Mild Conditions

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1897
Author(s):  
Hideyasu China ◽  
Nami Kageyama ◽  
Hotaka Yatabe ◽  
Naoko Takenaga ◽  
Toshifumi Dohi
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Practical Method ◽  
Hypervalent Iodine ◽  
Mild Conditions ◽  
Sequential Procedures ◽  
Iodine Compounds ◽  
Practical Synthesis ◽  
Iodosobenzoic Acid ◽  
Lower Temperature

We report a convenient and practical method for the preparation of nonexplosive cyclic hypervalent iodine(III) oxidants as efficient organocatalysts and reagents for various reactions using Oxone® in aqueous solution under mild conditions at room temperature. The thus obtained 2-iodosobenzoic acids (IBAs) could be used as precursors of other cyclic organoiodine(III) derivatives by the solvolytic derivatization of the hydroxy group under mild conditions of 80 °C or lower temperature. These sequential procedures are highly reliable to selectively afford cyclic hypervalent iodine compounds in excellent yields without contamination by hazardous pentavalent iodine(III) compound.

scholarly journals All organic multiferroic magnetoelectric complexes with strong interfacial spin-dipole interaction

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Yuying Yang ◽  
Zhiyan Chen ◽  
Xiangqian Lu ◽  
Xiaotao Hao ◽  
Wei Qin
Keyword(s):  
Magnetic Field ◽  
Light Intensity ◽  
Room Temperature ◽  
Incident Light ◽  
Dipole Interaction ◽  
Interfacial Interaction ◽  
Magnetoelectric Coupling ◽  
Incident Light Intensity ◽  
Organic Ferromagnets ◽  
Magnetoelectric Coefficient

AbstractThe organic magnetoelectric complexes are beneficial for the development on flexible magnetoelectric devices in the future. In this work, we fabricated all organic multiferroic ferromagnetic/ferroelectric complexes to study magnetoelectric coupling at room temperature. Under the stimulus of external magnetic field, the localization of charge inside organic ferromagnets will be enhanced to affect spin–dipole interaction at organic multiferroic interfaces, where overall ferroelectric polarization is tuned to present an organic magnetoelectric coupling. Moreover, the magnetoelectric coupling of the organic ferromagnetic/ferroelectric complex is tightly dependent on incident light intensity. Decreasing light intensity, the dominated interfacial interaction will switch from spin–dipole to dipole–dipole interaction, which leads to the magnetoelectric coefficient changing from positive to negative in organic multiferroic magnetoelectric complexes.

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