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Zhao G.,CAS Shanghai Institute of Optics and fine Mechanics | Zhao G.,University of Chinese Academy of Sciences | Wang S.,CAS Shanghai Institute of Optics and fine Mechanics | Wang S.,University of Chinese Academy of Sciences | And 2 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

An Er3+/Yb3+ co-doped bismuth germanate glass is synthesized and analyzed. The radiative characteristics and mid-infrared spectroscopic properties are investigated under excitation of a conventional 980 nm laser diode. The prepared glass possesses higher spontaneous transition probability (68.82 s-1) and larger calculated emission cross-section (7.73 × 10-21 cm2) corresponding to the 4I11/2 → 4I13/2 transition. The calculated energy migration coefficient (CDD) among Yb3+ ions is larger than the energy transfer coefficient (CDA) from Yb3+ to Er3+, indicating the energy transfer process assisted with energy migration. The excellent spectroscopic properties along with the outstanding thermal stability suggest that this glass may become an attractive host for developing solid state lasers operating in the mid-infrared range. © 2012 Published by Elsevier B.V. All rights reserved. Source


Zhao G.,CAS Shanghai Institute of Optics and fine Mechanics | Zhao G.,University of Chinese Academy of Sciences | Tian Y.,CAS Shanghai Institute of Optics and fine Mechanics | Tian Y.,University of Chinese Academy of Sciences | And 3 more authors.
Chinese Optics Letters | Year: 2012

An Er 3+-doped lead-free bismuth germanate glass is synthesized. Its 2.7-μm emission property is analyzed, and the efficient 2.7-μm emission from the glass is observed under 980-nm laser diode excitation. The prepared glass possesses high spontaneous transition probability (64.8 s -1) and a large calculated emission cross section (6.61×10 -21 cm 2) corresponding to the 4I 11/2→ 4I 13/2 transition. The multiphonon relaxation rate for the excited state 4I 11/2 is only 236 s -1. Therefore, the excellent spectroscopic properties and outstanding thermal stability suggest that this glass is a suitable host for developing solid-state lasers operating in the mid-infrared. © 2012 Chinese Optics Letters. Source


Zhao G.,CAS Shanghai Institute of Optics and fine Mechanics | Zhao G.,University of Chinese Academy of Sciences | Kuan P.-W.,CAS Shanghai Institute of Optics and fine Mechanics | Kuan P.-W.,University of Chinese Academy of Sciences | And 2 more authors.
Optical Materials | Year: 2013

This work studied the spectroscopic properties of Er3+/Tm 3+ co-doped bismuth germanate glass. Through Tm3+ co-doping and 980 nm LD pumping, the enhanced green (2H 11/2, 4S3/2→4I15/2) and red (4F9/2→4I15/2) upconversion emission as well as 2.7 μm emission (4I11/2→ 4I13/2) of Er3+ ions were observed. Meanwhile, the 1.5 μm emission (Er3+:4I13/2→ 4I15/2) is significantly suppressed. Broadband 1.8 μm emission (Tm3+:3F4→3H 6) is got. The luminescent characteristics and dominant energy transfer mechanisms between Er3+ and Tm3+ ions are investigated. The emission cross section at 2.7 μm of this glass is found to be as high as 1.10 × 10-20cm2. Therefore, the spectroscopic characteristics of Er3+/Tm3+ co-doped bismuth germanate glass indicate it is a potential active medium for optical upconversion and mid-infrared luminescence devices. © 2012 Elsevier B.V. All rights reserved. Source


Wang Z.,CAS Shanghai Institute of Ceramics | Wang Z.,University of Chinese Academy of Sciences | Zhou G.,CAS Shanghai Institute of Ceramics | Qin X.,CAS Shanghai Institute of Ceramics | And 4 more authors.
Journal of the European Ceramic Society | Year: 2013

A simple combustion method was used to synthesize LaGdZr2O7 powder and LaGdZr2O7 transparent ceramic was prepared by vacuum sintering at 1850°C for 6h. The final transparent ceramic, with a density of 6.46g/cm3, has an in-line transmittance of 70.7% at 1000nm and a refractive index of 2.08 at 632.8nm. © 2012 Elsevier Ltd. Source


Patent
SCHOTT Glass Technologies Suzhou Co. | Date: 2015-12-21

A method for making a bonded article, wherein a thin glass substrate is bonded on a support substrate in the absence of any interlayer by an electrostatic adhesion process with the assistance of external pressure, the pressure is applied constantly or stepwise during the adhesion process by use of a tool such as a roll or a wheel or other movable device with curved surface. The bonded article has no defects, e.g. bubbles or inclusions, in the bonded interface, which benefits transportation of the thin glass substrate and its post-processing as well. Such defect-free bonded article is also disclosed. Pressure supported electrostatic adhesion, initiated by electrostatic charges adhesion of a two members, e.g. a substrate member and a support member, is enabled to minimize, prevent and exclude defects, distortion between the adhered surfaces.

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