HyFi Bragg: Proposal for the purchase of a laser for hydrogen free inscription of fibre bragg grating

HyFi Bragg：关于购买用于光纤布拉格光栅无氢刻字的激光器的提案

• 批准号: 390399-2010
• 负责人: Kashyap, Raman
• 金额: $ 8.79万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=443184
• 关键词: HyFi; Bragg; Proposal; purchase; laser

Fibre Bragg gratings are generally written in fibres with ultra-violet lasers, or more recently with femtosecond pulse lasers. In order to increase the refractive index change for the purpose of fabricating strongly reflecting gratings through the exposure to the lasers, it has been necessary to photosensitise the optical fibre by doping the fibre with boron and/or with high pressure hydrogen of order 200Bar. The latter requires special equipment and handling and is the only technique available to write good gratings in standard optical fibres with UV lasers. Femtosecond lasers can be used with hydrogen-free fibres, but are generally used in a point-by-point writing, or with care using a phase-mask. The quality of gratings can be variable, without great care being used.

光纤布拉格光栅通常用紫外线激光写入光纤，或最近用飞秒脉冲激光写入光纤。为了增加折射率变化以通过暴露于激光来制造强反射光栅，有必要通过在光纤中掺杂200bar量级的硼和/或高压氢来对光纤进行光敏化。后者需要特殊的设备和操作，是唯一可以用紫外光激光器在标准光纤上写入良好光栅的技术。飞秒激光可以与无氢光纤一起使用，但通常用于逐点写入，或小心使用相位掩模。格栅的质量可以是可变的，而不是非常小心地使用。