Single-step writing of Bragg grating waveguides in fused silica with an externally modulated femtosecond fiber laser

被引：114

作者：

Zhang, Haibin ^{[1
]}

Eaton, Shane M. ^{[1
]}

Herman, Peter R. ^{[1
]}

机构：

[1] Univ Toronto, Inst Opt Sci, Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canada

来源：

OPTICS LETTERS | 2007年 / 32卷 / 17期

关键词：

D O I：

10.1364/OL.32.002559

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

For the first time to our knowledge, high-strength (> 30 dB) first-order Bragg grating waveguides were fabricated in bulk fused silica glass in a single-scanning step by modulating a high-repetition-rate feratosecond fiber laser with an external acousto-optic modulator. The modulation induced a waveguide segmentation by delivering controlled bursts of laser pulses to define an array of partially overlapped refractive index voxels. With appropriate choice of modulation frequency and sample scanning speed, low loss waveguides could be formed at high writing speeds to yield sharp Bragg spectral resonances tunable over the 1300 to 1550 mn telecom band. Effects of acousto-optic modulation duty cycle on propagation loss and grating strength are characterized. This modulation method offers facile control and integration of multiwavelength Bragg grating devices to enhance overall functionality of optical circuits in three-dimensional geometries. (c) 2007 Optical Society of America.

引用

页码：2559 / 2561

页数：3

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