Polarization‐insensitive frequency selective rasorber with broad absorption band and two‐sided transmission bands

Author(s):  
Mehran Manzoor Zargar ◽  
Archana Rajput ◽  
Kushmanda Saurav ◽  
Shiban Kishen Koul
1973 ◽  
Vol 19 (5) ◽  
pp. 1538-1538
Author(s):  
A. I. Sidorova ◽  
T. V. Sukhanova ◽  
E. M. Ushakova

Author(s):  
Wei-Bo Liao ◽  
Ya-Chen Chang ◽  
Cheng-Chung Lee ◽  
Yu-Sheng Chen ◽  
Chien-Cheng Kuo

2012 ◽  
Vol 508 ◽  
pp. 235-239 ◽  
Author(s):  
Yutaka Fujimoto ◽  
Yoshisuke Futami ◽  
Takayuki Yanagida ◽  
Shunsuke Kurosawa ◽  
N. Kawaguchi ◽  
...  

Single Crystals of Eu-Doped Calcium Orthoborate Have Been Grown by Micro-Pulling (μ-PD) Technique with Radio Frequency Heating System, and its Transmittance, Photoluminescence and Radiation Responses Were Investigated. In Transmittance Spectra, Eu-Doped Crystal Showed Broad Absorption Band around 200-450 nm, which Is due to the Complex of Charge Transfer (CT) Transition and 4f-4f Transition of Eu3+. Intense Eu2+5f-4f and Eu3+4f-4f Emission Peaks Were Observed when Excited to 265 nm and 385 nm, and the Calculated Decay Times Were 230 ns and 1.5 ms, Respectively.241Am 5.5 Mev α-Ray Excited Radioluminescence Spectra Indicated both Eu2+5f-4f and EuSuperscript text3+ 4f-4f Emission Peaks.


2004 ◽  
Vol 19 (4) ◽  
pp. 1203-1207 ◽  
Author(s):  
Yan Wang ◽  
Chaoyang Tu ◽  
Changcang Huang ◽  
Zhenyu You

Yb3+-doped single-crystal Ca3Y2(BO3)4 with dimension φ20 × 55 mm was grown by the Czochralski method. The structure of it was determined by x-ray diffraction. It belongs to the orthorhombic system, space group Pnma, with the following parameters: a= 7.1690(4), b = 15.4758(8), c = 8.5587(6) Å, V = 949.55(10)Å3, Mr = 537.51, Z = 2, Dc = 3.8 g/cm3, (MoKa) = 0.71073 Å, F(000) = 508, μ = 6.927 mm-1, final R = 0.0670, and wR = 0.1542 for 2975 independent reflections. The structure of Yb:Ca3Y2(BO3)4 is made up of three set of M-oxygen distorted polyhedrons, and three set of BO3 planar triangles. Ca2+ and Y3+ ions occupy three M sites statistically. Yb3+ ions substitute Y3+ ions to enter these three lattices. The adsorption and emission spectra were measured. It exhibits a broad absorption band ranging from 850 to 1000 nm in the absorption spectrum, which is well matched with the emission wavelength of a laser diode. A broad emission spectrum ranging from 927.95 to 1102.7 nm was observed under the excitation of 895 nm.


1989 ◽  
Vol 163 ◽  
Author(s):  
P. Trautman ◽  
J.M. Baranowski

AbstractLinear dichroism has been measured in the broad absorption band of the EL2 defect in GaAs under uniaxial stress. In addition, the splittings of the EL2 zero phonon line (ZPL) at 8378 cm-1 under uniaxial stress applied along [100], [111], and [110] directions have been measured. Splitting of the ZPL under [100] stress is over one order of magnitude smaller than under [111] stress, on the other hand, the linear dichroism in the broad absorption band is roughly equal for these two directions of stress. This is an evidence for the quenching of the coupling to tetragonal strains due to interaction with trigonal modes of the lattice (the Ham effect). Therefore, it is established, that the excited T2 state of EL2 is a localized state subject to dynamical Jahn-Teller coupling to trigonal modes of the lattice. The possibility that the excited T2 state has hydrogenic nature associated with the L minima is ruled out by the present results. The observed splittings of the ZPL together with polarization selection rules clearly indicate the tetrahedral Td symmetry of the EL2 defect ruling out any other point group in particular trigonal C3v In view of the presented experimental results, their interpretation, and recent theoretical investigations, the isolated arsenic antisite AsGa most successfully accounts for the properties of the neutral charge state of the EL2 defect.


CrystEngComm ◽  
2021 ◽  
Author(s):  
Shoujun Ding ◽  
Hao Ren ◽  
Hongyuan Li ◽  
Wenpeng Liu ◽  
Qingli Zhang ◽  
...  

In this work, a high-quality 2at% Dy3+ doped Gd3Sc2Al3O12 (Dy:GSAG) single crystal was grown successfully by the Czochralski method for the first time. Spectroscopic properties of the crystal were investigated...


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