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- 저자 : Ngac An Bang (검색결과 2 건)
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이종환,한영근,Ngac An Bang 한국광학회 2015 Current Optics and Photonics Vol.19 No.4
Transmission characteristics of long-period fiber gratings (LPFGs) fabricated by periodically etching aconventional single-mode fiber (SMF) are investigated. After coating the SMF with photoresist, the claddingof the SMF is symmetrically and periodically removed by using a wet etching technique resulting in theformation of the LPFG. Tensile strain reinforces the coupling strength between the core and the claddingmode based on the photoelastic effect. The extinction ratio of the SMF-based LPFG at a wavelength of1550.8 nm is measured to be -15.1 dB when the applied strain is 600 με . The ascent of ambient indexshifts the resonant wavelength to shorter wavelength because of the increase of the effective refractiveindex of the cladding mode. The extinction ratio is diminished by increase in the ambient index becauseof the induction of the optical attenuation of the cladding mode. The transmission characteristics of theproposed LPFG with variations in torsion are also measured. The photoelastic effect based on torsionchanges the extinction ratio and the resonant wavelength of the proposed SMF-based LPFG. Thepolarization-dependent loss of the LPFG is also increased by torsion because of the torsion-inducedbirefringence. The polarization-dependent loss of the LPFG at torsion of 8.5 rad/m is measured to be 3.9 dB
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Magnetocaloric Effect in Fe-Ni-Zr Alloys Prepared by Using the Rapidly-quenched Method
Nguyen Huy Dan,Nguyen Huu Duc,Tran Dang Thanh,Nguyen Hai Yen,Ngac An Bang,Do Thi Kim Anh,판더롱,유성초 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Fe90−xNixZr10 (x = 0, 5, 10, 15, 20 and 25) ribbons with various thicknesses were prepared byusing a melt-spinning technique. The Curie temperature, TC, of the alloys dramatically decreasedfrom 960 K to room temperature at high quenching rates. When the alloys had an amorphousstructure, their TC strongly depended on the Ni concentration. The maximum entropy change,|Sm|max, with H = 12 kOe, of the alloys was around 1 J·kg−1K−1 at room temperature. Onthe other hand, the full width at half maximum the entropy-change peak was quite large, 85 K,which was suitable for applications in magnetic refrigerators at room temperature.
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