A novel high birefringence photonic crystal fiber (PCF) was proposed, which consists of hexagonal inner ring and
octagonal outer ring. A full vector finite element was applied to investigate the mode birefringence and chromatic
dispersion. It has been demonstrated from the calculated results that high birefringence to the order of 0.001 can be
achieved and ultra-flattened dispersion of -0.8~+0.2 ps/(km•nm) is obtained in 1.5 to 1.65μm wavelength range.
A series of Zn, Fe double-doped LiNbO3 crystals were grown by Czochralski technique with 0.015wt% of Fe2O3 and with different concentration of ZnO. The defect structures of the Zn:Fe:LiNbO3 crystals were studied by X-ray diffraction analyses and IR absorption spectra. The results indicated that the lattice constants of the Zn:Fe:LiNbO3 increase with the concentration of ZnO increasing in the crystals. The result indicates that the absorption peaks of the IR transmission spectra shift to the shorter wavelength with the increasing of concentration of ZnO. The optical damage resistance ability of the Zn:Fe:LiNbO3 crystals were investigated by straightly observing transmission facula distortion method, respectively. The results demonstrate that, compared with of Fe:LiNbO3, the optical damage resistance ability of the Zn (7.0mol%):Fe:LiNbO3 crystals is two orders magnitude higher than that of LiNbO3 crystal. 6.0mol% of ZnO is the perfect doping concentration.
The Tb:Fe:LiNbO3 and LiNbO3 crystals with vary Li/Nb ratio in the melt were grown by the top-seed solution growth (TSSG) method and Czochralski technique, respectively. Their Li/Nb ratios were calculated by the lattice parameters. The defect structure of the Tb:Fe:LiNbO3 and LiNbO3 with vary Li/Nb ratio in the melt crystals was studied by X-ray analyses and UV spectra. The results show that an increase of Li/Nb ratio in the melts leads to a decrease of the lattice constants, which is accompanied by an improvement of the LiNbO3 lattice structure because of diminishing concentration of intrinsic nonstoichiometric defects.
Nondoped and Ce2O3 doped near stoichiometric LiNbO3 (Ce:LiNbO3) single crystals were grown by the top-seeded solution method. The solution with [Li]/[Nb] ratio of 1 contained K2O component of 10.6 mol%(7.0 wt%). The ultraviolet-visible absoprtion spectra of the crystals were measured in order to analyze their structure. The photorefractive properties of stoichiometric LiNbO3 crystals were investigated and compared with congruent LiNbO3 crystal. Two-wave-coupling experiments shown that doped stoichiometric LiNbO3 crystals exhibited much larger photorefractive gain and faster response speed than congruent ones.
The formation of PtSi ultra-thin film prepared by pulsed laser deposition during pulsed laser annealing has been studied. The growth sequence of the Pt2Si and the PtSi phases that evolved as the result of the diffusion reaction in the bilayers was monitored by X-ray photoelectron spectrum (XPS). The structure characteristics of PtSi thin films prepared by different preparing conditions were investigated by X-ray diffraction and XPS. Compared to conventional furnace anneal, we got superior uniformity, lower continuous film thickness of the resulting PtSi layers and smoother PtSi/Si interfaces.
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