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Chalcogenide photonic crystal fiber for ultraflat mid-infrared supercontinuum generation

Chinese Optics Letters 2016年第12期14卷 141-145页

作者： sandeep vyas Takasumi Tanabe Manish Tiwari Ghanshyam Singh Department of ECE Vivekananda Institute of Technology (East) Department of EEE Keio University Department of ECE Manipal University Department of ECE Malaviya National Institute of Technology

In this Letter, we numerically simulate the generation of a 1–15 μm mid-infrared supercontinuum（SC） from a highly nonlinear Ge_（11.5）As24Se_（64.5）-based photonic crystal fiber（PCF）. This ultra-broadband SC is achieved in a100 mm long PCF pumped using 85 fs laser pulses operated at 3.1 μm and a peak pulse power of 3 k W. The proposed design offers a flat dispersion profile with two zero dispersion wavelengths. This broad and flat dispersion profile of the Ge_（11.5）As24Se_（64.5）PCF, combined with the high nonlinearity（2474 W-1km-1）, generates an ultra-broadband SC.

关键词： photonic pumped operated broadband nonlinearity numerically soliton silica pumping pitch

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Structural and Morphological Study of a Series of Ball Milled Nanocrystalline Fe1-xAlx(0.3 ≤ x≤ 0.6) Alloys

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Journal of Modern Physics 2014年第8期5卷 643-648页

作者： sandeep Rajan Rajni Shukla Anil Kumar Anupam vyas Ranjeet Brajpuriya Department of Physics Amity University Haryana Manesar India Department of Physics Deenbandhu Chhotu Ram University of Science & Technology Murthal India

In the present manuscript, the authors have systematically investigated the structural and morphological properties of a series of mechanically alloyed Fe1-xAlx (0.3 ≤ x ≤ 0.6) samples using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). All the samples, after 5 hr of milling, show crystalline structure, irrespective of the constituent concentration and are textured mainly along (110) direction. In Fe-rich samples, the formation of an off-stoichiometric Fe3Al phase is favored and in case of Al-rich samples, both Al-rich phases and clustering of Al atoms are present. Analysis of line breadths was carried out to get an insight into the interrelated effects of average crystallite size, and lattice parameters. The grain size of constituents was decreased to the nanometer range (between 6 - 8 nm) and the constituents dissolved at the nanograin boundaries. Similar conclusions were also revealed from the SEM results which show that the initial shape of particles disappeared completely, and their structure became a mixture of small and large angularshaped crystallites with different sizes. The results of this research could be directly employed in the design of deformation schedules for the industrial processing of Fe-Al alloys.

关键词： Intermetallics FeAl Phase Formation XRD SEM Mechanical Alloying

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The Synthesis and Characterization of Arc Melted Fe1-xAlxAlloys

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Journal of Applied Mathematics and Physics 2013年第2期1卷 4-8页

作者： sandeep Rajan Rajni Shukla Anil Kumar Anupam vyas Ranjeet Kumar Brajpuriya Department of Physics Amity University Haryana Gurgaon India. Department of Physics Deenbandhu Chhotu Ram University of Science & Technology Sonipat India

The paper presents correlation study on a series of Fe1-xAlx alloy samples prepared by arc melting. All the samples show crystalline structure, irrespective of the Al content and are textured mainly along (110) direction. The particle size decreases rapidly with x particularly after x > 0.3. The corresponding magnetic measurements were obtained at room temperature using a VSM, with a maximum applied field of 14 kOe. The results show that the ferromagnetic state of the samples disappears with x, and becomes paramagnetic for alloys with x ≥ 0.4. It is also found that coercivity (Hc) and resistivity increase with x. The results were interpreted in terms of continuous change in their electronic structure i.e. overlap of the electron wave functions of the magnetic atoms with the Al electron wave function.

关键词： Transition Metal Aluminides Magnetization and Electronic Properties

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