UV INDUCED DENSIFICATION DURING BRAGG GRATING INSCRIPTION GE-SIO2 PREFORMS

被引：82

作者：

POUMELLEC, B

GUENOT, P

RIANT, I

SANSONETTI, P

NIAY, P

BERNAGE, P

BAYON, JF

机构：

[1] UFP ALCATEL ALSTHOM RECH,F-91460 MARCOUSSIS,FRANCE

[2] UNIV SCI & TECH LILLE FLANDRES ARTOIS,LDMP LAB,CNRS,URA 779,F-59655 VILLENEUVE DASCQ,FRANCE

[3] CTR NATL ETUD TELECOMMUN,OCM LAB,FOG,F-22301 LANNION,FRANCE

来源：

OPTICAL MATERIALS | 1995年 / 4卷 / 04期

关键词：

D O I：

10.1016/0925-3467(94)00114-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The only investigation of a Bragg grating in Ge:SiO2 in the direct space known to date is a view from an optical microscope. Here, we show surface level modulations associated with the writing of the grating. Our conclusion is that a densification takes place. We estimate the corresponding peak to peak change of the refractive index to be 1.4-1.7 X 10(-4) whether a pulsed or a CW irradiation mode is used. Compared to the refractive index change obtained by optical measurement, this accounts for a nonnegligible part (7% for pulsed and 26% for CW irradiation). We discuss the possible application of the observations to fiber and the differences in photo-chemical reactions according to the irradiation mode.

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页码：441 / 449

页数：9

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