Ultrafast laser inscription of Bragg-grating waveguides using the multiscan technique.
Ultrafast laser inscription of Bragg-grating waveguides using the multiscan technique.
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DOI：
10.1364/ol.37.000491
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发表时间：
2012-02
期刊：
影响因子：
3.6
通讯作者：
Graeme Brown;R. Thomson;A. Kar;N. Psaila;H. Bookey
中科院分区：
文献类型：
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作者：
Graeme Brown;R. Thomson;A. Kar;N. Psaila;H. Bookey
报道了用超快激光刻蚀技术在硼硅酸盐玻璃衬底上制备高强度（>30 dB）一阶布拉格光栅波导。使用公知的多扫描制造技术控制每个波导的横截面，其中通过多次扫描样品通过激光焦点来构造期望的波导横截面。为了制造高强度的光栅，因此有必要精确控制和空间同步的折射率调制压印在材料中的每一次扫描。布拉格光栅波导刻使用飞秒光纤激光器，外部调制使用声光调制器。因此，通过使用由衬底平移台本身提供的位置敏感触发信号来触发声光调制器，实现了激光调制中所需的精度。
We report the fabrication of high-strength (>30 dB) first order Bragg-grating waveguides in borosilicate glass substrates using ultrafast laser inscription. The cross section of each waveguide was controlled using the well known multiscan fabrication technique, where the desired waveguide cross section is constructed by scanning the sample through the laser focus multiple times. In order to fabricate high-strength gratings, it was therefore necessary to precisely control and spatially synchronize the refractive index modulations imprinted in the material by each scan. The Bragg-grating waveguides were inscribed using a femtosecond fiber laser that was externally modulated using an acousto-optic modulator. The required precision in the laser modulation was thus achieved by triggering the acousto-optic modulator using a position sensitive trigger signal supplied by the substrate translation stages themselves.