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有好几种偏振器已在实验室中经过论证并投入日常应用。受控弯曲和受控拉锥能使双折射光纤二个正交偏振模的一个模引起附加损耗,这也许已证明是非常有用的。把金属膜镀敷到双折射光纤外面的技术也已被应用,但有某些难度。 Andrews公司的研究人员已发明了一种使镀敷和使用时均很方便的金属膜技术。Dyott等在[Opt,Lett. 12:287(1987)]上曾介绍过这种技术,所用的光纤为D形光纤,这种光纤具有椭圆纤芯和高芯-包折射率差引起的双折射。工艺程序是:先把D形光纤的一短段平面蚀刻到暴露出导波区,然后在温度控制条件下给被蚀刻部位镀敷一薄层铟金属。利用一层极簿的铟低价氧化物使铟层紧贴玻璃。铟低价氧化物不但具有
Several polarizers have been demonstrated in the lab and put into everyday use. Controlled bending and controlled tapering can cause one mode of two orthogonal polarization modes of the birefringent fiber to cause additional loss, which may prove to be very useful. Plating metal films onto the outside of birefringent fibers has also been used, but with some difficulties. Researchers at Andrews have invented a metal film technology that makes plating and handling easy. This technique was introduced by Dyott et al. [Opt. Lett. 12: 287 (1987)] using optical fibers in the form of D-shaped optical fibers with an elliptical core and a high core-birefringence . The process sequence is as follows: First, a short section of the D-shaped optical fiber is etched to expose the guided wave region, and then a thin layer of indium metal is plated on the etched region under the temperature control condition. The indium layer is made to adhere to the glass using a very thin layer of indium suboxide. Indium suboxide not only has