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    Method of doping porous glass preforms
    139.
    发明授权
    Method of doping porous glass preforms 失效
    抛光多孔玻璃预制件的方法

    公开(公告)号：US5236481A

    公开(公告)日：1993-08-17

    申请号：US839915

    申请日：1992-02-21

    Applicant: George E. Berkey

    Inventor： George E. Berkey

    IPC: C03B37/014

    CPC classification number: C03B37/01446 ,  C03B2201/30 ,  C03B2201/32 ,  C03B2201/34 ,  C03B2201/36 ,  C03B2201/40 ,  C03B2201/54

    Abstract: Disclosed is a method of forming a doped glass article. Heated glass particles are deposited on a mandrel where they adhere together to form a porous glass preform having interconnective pores. The mandrel is removed to form a tubular preform having an axial aperture. The preform is suspended in a consolidation furnace by a gas conducting handle having a dopant containing chamber. As the handle and preform are heated, there is flowed through the chamber a gas that reacts with the heated dopant to form a reactant gas that flows into the aperture and into pores, whereby a dopant is incorporated into the porous glass preform. The doped preform is heat treated to consolidate it into an elongated non-porous glass body containing the dopant. The glass body can be provided with cladding glass and drawn into an optical fiber.

    Method for manufacturing a gradient index optical element
    140.
    发明授权
    Method for manufacturing a gradient index optical element 失效
    梯度折射率光学元件的制造方法

    公开(公告)号：US5171344A

    公开(公告)日：1992-12-15

    申请号：US717417

    申请日：1991-06-18

    Applicant: Satoshi Noda

    Inventor： Satoshi Noda

    IPC: C03B37/014 ,  C03B19/12 ,  C03B19/14 ,  C03C1/00 ,  C03C8/12 ,  C03C21/00 ,  C03C23/00 ,  G02B3/00

    CPC classification number: G02B3/0087 ,  C03B19/12 ,  C03B19/1438 ,  C03C1/006 ,  C03C23/0095 ,  C03B2201/30 ,  C03B2201/31 ,  C03B2201/34 ,  C03B2201/40 ,  C03B2201/42 ,  C03B2201/54 ,  Y10S65/901

    Abstract: In accordance with the present invention, the dopant within one gradient index optical element has two independent concentration distributions. Particularly to use the present invention to obtain a gradient index optical element having an excellent chromatic aberration correction ability, it is only needed to make such dopant distributions as shown in the previously stated Japanese Patent Application No. 280897/1989. However, as to the doping of a dopant into a porous body, there is a limit in the amount which can be doped. This is a disadvantage of the molecular stuffing method, but the reason for this is that the dopant must be supplied into the holes as a solution and it is largely restricted by the solubility of the dopant in the solvent. In addition, since the intra-hole fixing of the dopant depends on the solubility difference by temperature or that by solvent exchange, it is further restricted. For this, the latter process which is an application of the molecular stuffing method preferably takes the distribution that has less doping amount.Accordingly, a large concentration distribution must be provided to the dopant in the preceding process. For that, the preceding process is desirably a gel which has sufficiently large concentration gradient by the sol-gel method. However, the sol-gel method also has a defect, in which the distribution provision relies on the elution of the dopant metal, and thus a convex distribution is easier to produce in principle.In view of the foregoing, it is the most effective that the concentration gradient of the first dopant is formed in a convex shape by the sol-gel method using alcoxide as the raw material for retreiving the first dopant, and that the concentration gradient of the second dopant is formed in a concave shape by an application of the molecular stuffing method.

    Abstract translation: 根据本发明，一个梯度折射率光学元件内的掺杂剂具有两个独立的浓度分布。 特别是为了使用本发明获得具有优异的色像差校正能力的梯度折射率光学元件，仅需要进行如前述日本专利申请280897/1989所示的掺杂剂分布。 然而，关于将掺杂剂掺杂到多孔体中，可以掺杂的量存在限制。 这是分子填充方法的缺点，但其原因是必须将掺杂剂作为溶液供给到孔中，并且其很大程度上受掺杂剂在溶剂中的溶解度的限制。 此外，由于掺杂剂的孔内固定取决于温度下的溶解度差异或通过溶剂交换的溶解度差异，因此进一步受限制。 为此，作为分子填充方法的应用的后一种方法优选具有较少掺杂量的分布。 因此，在前述方法中必须向掺杂剂提供大的浓度分布。 为此，上述方法理想地是通过溶胶 - 凝胶法具有足够大的浓度梯度的凝胶。 然而，溶胶 - 凝胶法也存在缺陷，其中分配条件依赖于掺杂剂金属的溶出，因此原理上更容易产生凸分布。 鉴于上述，最有效的是通过溶胶 - 凝胶法将第一掺杂剂的浓度梯度形成为凸形，其中使用的是以氧化铝作为回收第一掺杂剂的原料，并且， 通过使用分子填充方法将第二掺杂剂形成为凹形。

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