Femtosecond laser-induced refractive index modifications in fluoride glass

被引：40

作者：

Berube, Jean-Philippe ^{[1
]}

Bernier, Martin ^{[1
]}

Vallee, Real ^{[1
]}

机构：

[1] Univ Laval, COPL, Quebec City, PQ G1V 0A6, Canada

来源：

OPTICAL MATERIALS EXPRESS | 2013年 / 3卷 / 05期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

WAVE-GUIDES; FUSED-SILICA; FIBERS; FABRICATION; WRITTEN; PULSES;

D O I：

10.1364/OME.3.000598

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The interaction of focused 800 nm femtosecond (fs) laser pulses at low (1-45 kHz) and moderate (50-250 kHz) repetition rates with fluoride (ZBLAN-type) bulk glass is investigated in detail. It is shown that at repetition rates lower than similar to 50 kHz and low pulse energies, the refractive index change induced by pulse filamentation is mainly negative at the irradiated zone. At repetition rates above 50 kHz, structures are formed as a result of the fs laser pulse induced heat accumulation and subsequent melting of the glass. The refractive index profile of the structures produced in this regime is influenced by the laser writing conditions (repetition rate, pulse energy and translation speed). It is shown that waveguides with large circular cross sections and smooth positive index changes can be formed through a precise control of glass exposure. Those waveguides can exhibit low propagation losses (similar to 0.4-2 dB/cm) and are thus good candidates for the development of mid-IR integrated photonic devices. Both absorbed energy and repetition rate thresholds for heat accumulation are determined experimentally. (C) 2013 Optical Society of America

引用

页码：598 / 611

页数：14

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