UV-Induced Refractive Index Changes in Germanosilicate Fibres

D. Hand, P. Russell, P. J. Wells
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引用次数: 1

Abstract

Photorefractivity in germanosilicate fibres was first reported by Hill and co-workers over a decade ago1. They were able to produce holographic gratings 60 cm long by interfering counterpropagating modes at 488 and 514.5 nm. Further measurements by Lam and Garside2 indicated that reflection efficiencies approached 100% for interaction lengths of l-2cm implying refractive index modulations of the order of 10-5. They were unable to estimate the spectral variation of the index change Δn(λ) because the reflection band was restricted to the recording wavelength. It is clear that, for distributed reflectors at communications wavelengths, the effect is only useful if i) a substantial index change, extends out to beyond 1 μm and ii) a satisfactory method of side-writing gratings can be found.
锗硅酸盐纤维紫外光诱导折射率的变化
十多年前,希尔及其同事首次报道了锗硅酸盐纤维的光折射率。他们能够在488和514.5 nm处通过干涉反传播模式产生60厘米长的全息光栅。Lam和Garside2的进一步测量表明,当相互作用长度为l-2cm时,反射效率接近100%,这意味着折射率调制的数量级为10-5。他们无法估计指数变化Δn(λ)的光谱变化,因为反射波段仅限于记录波长。很明显,对于通信波长的分布式反射器,只有当i)折射率发生实质性变化,延伸到1 μm以上,ii)可以找到令人满意的侧写光栅方法时,该效应才有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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