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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Fabrication of heavy metal fluoride glass, optical planar waveguides by hot-spin casting
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Fabrication of heavy metal fluoride glass, optical planar waveguides by hot-spin casting

机译：通过热旋铸造制造重金属氟化物玻璃和平面光学波导

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Hot-spin casting is further investigated using a customised rig for making optical planar waveguides from inorganic-compound-glasses. The rig enables a controlled mass of core-glass, held above its liquidus, to be gravity-cast onto the top surface of a spinning cladding-glass substrate that has been pre-heated to around its glass transformation temperature. Spinning encourages the cast liquid to spread as a film over the top surface of the glass substrate. The mass of liquid cast is controlled by the timed opening of an orifice in the base of the core-glass melt-crucible. The resulting step index, slab optical waveguides are annealed, then cooled to room temperature; they comprise a higher refractive index, glass film core, on top of a lower refractive index glass substrate cladding. The glass film core is air-clad. at its upper surface. The process is applied to two heavy metal fluoride core/clad. glass pairs, namely ZBLANPb/ZBLAN and ZBLALiYPb/HBLANY (where ZBLANLiYPb is ZrF4-BaF2-LaF3-AlF3-LiF-YF3-PbF2 and H is HfF4) to give waveguides of small and large numerical aperture (NA) (e.g. at 643.8 nm wavelength, NA is 0.18 and 0,33, respectively). The Hot-Spin-Cast waveguides exhibit a guiding region whose top surface tends to be parallel to the upper surface of the underlying substrate. However, flatness of the top surface of the guiding region is limited by the flatness of the top surface of the underlying substrate. Multimode slab waveguiding is demonstrated for both NA waveguide types for glass film cores of depths >= 10 mu m. (c) 2008 Elsevier B.V. All rights reserved.
机译：使用定制的设备进一步研究了热旋铸造，该设备用于由无机化合物玻璃制成光学平面波导。该装置可将固定在其液相线上方的受控玻璃芯块重力浇铸到已预热至其玻璃转变温度附近的旋转包层玻璃基板的顶表面上。旋转促进浇铸液体在玻璃基板的顶部表面上成膜扩散。定时浇铸的质量是通过定时打开芯玻璃熔体坩埚底部的孔口来控制的。将得到的阶跃折射率的平板光波导退火，然后冷却至室温;它们在折射率较低的玻璃基板覆层上包含折射率较高的玻璃膜芯。玻璃膜芯是空气包覆的。在其上表面。该工艺适用于两个重金属氟化物芯/包层。玻璃对，即ZBLANPb / ZBLAN和ZBLALiYPb / HBLANY（其中ZBLANLiYPb是ZrF4-BaF2-LaF3-AlF3-LiF-YF3-PbF2，H是HfF4），以提供大数值孔径（NA）（例如在643.8 nm处）的波导波长，NA分别为0.18和0.33）。热自旋铸造波导具有引导区域，该引导区域的顶表面趋于平行于下层基板的上表面。但是，引导区域的顶面的平坦度受到下面的基板的顶面的平坦度的限制。对于两种深度大于等于10μm的玻璃膜芯的NA波导类型，都证明了多模平板波导。 （c）2008 Elsevier B.V.保留所有权利。

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