基于飞秒激光的光纤微结构制备及特性研究
发布时间：2018-10-21 19:36
【摘要】：由于光纤具有重量轻、抗干扰、损耗小、耐腐蚀等优点,以光纤为基础制作的器件在光纤传感中得到了广泛应用。现在,光纤器件的微加工及应用越来越受到人们的关注。飞秒激光具有脉冲短、峰值功率高等特点,在材料微加工方面逐渐被人们采用。本文阐述了飞秒激光的发展历程以及飞秒激光微加工的优点。总结了国内外在光纤上制作微结构的研究现状,分析了飞秒激光与透明材料的相互作用机理。推导了光在光纤包层和纤芯中的传输方程。介绍了长周期光纤光栅的耦合模式以及双光束干涉的原理。研究了飞秒激光能量密度、脉冲个数对光纤烧蚀孔洞直径的影响,确定了激光加工的最佳参数。利用单脉冲飞秒激光在光纤纤芯中分别刻蚀了间距为2μm和5μm的单点微结构,得到的每个微结构长约7μm、宽约2μm。测量了不同间距下的光纤微结构的光谱及温度特性。利用飞秒激光横向直写法在光纤纤芯制作了长度为200μm、周期为400um、总长度为2mm的长周期光纤光栅,刻蚀长度正好为周期的一半。测试并分析了其光谱及温度特性。本文提出了用朗奇光栅分光来实现飞秒激光干涉微加工的方法,实际刻蚀了周期为20μm和周期为12μm的光纤光栅,研究了加工后光纤的光谱及温度特性。
[Abstract]:Because optical fiber has the advantages of light weight, anti-interference, low loss and corrosion resistance, the devices based on optical fiber have been widely used in optical fiber sensing. Nowadays, people pay more and more attention to the microfabrication and application of optical fiber devices. Femtosecond laser is widely used in material microfabrication because of its short pulse and high peak power. This paper describes the development of femtosecond laser and the advantages of femtosecond laser micromachining. The research status of fabrication of microstructures on optical fibers at home and abroad is summarized, and the interaction mechanism between femtosecond laser and transparent materials is analyzed. The propagation equations of light in fiber cladding and core are derived. The coupling mode of long period fiber grating and the principle of double beam interference are introduced. The effects of femtosecond laser energy density and the number of pulses on the diameter of ablative holes in optical fiber are studied and the optimum parameters of laser processing are determined. The single-point microstructures with spacing of 2 渭 m and 5 渭 m were etched in the fiber core by monopulse femtosecond laser. The obtained microstructures were about 7 渭 m in length and 2 渭 m in width. The spectrum and temperature characteristics of fiber microstructures with different spacing were measured. A long-period fiber grating with a length of 200 渭 m, a period of 400um and a total length of 2mm has been fabricated by femtosecond laser transverse direct writing in the fiber core. The etching length is exactly half of the period. The spectral and temperature characteristics were measured and analyzed. In this paper, a method of femtosecond laser interferometric microfabrication using Range grating is proposed. The fiber grating with 20 渭 m period and 12 渭 m period is actually etched. The spectral and temperature characteristics of the processed fiber are studied.
【学位授予单位】：黑龙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
本文编号：2286152
[Abstract]:Because optical fiber has the advantages of light weight, anti-interference, low loss and corrosion resistance, the devices based on optical fiber have been widely used in optical fiber sensing. Nowadays, people pay more and more attention to the microfabrication and application of optical fiber devices. Femtosecond laser is widely used in material microfabrication because of its short pulse and high peak power. This paper describes the development of femtosecond laser and the advantages of femtosecond laser micromachining. The research status of fabrication of microstructures on optical fibers at home and abroad is summarized, and the interaction mechanism between femtosecond laser and transparent materials is analyzed. The propagation equations of light in fiber cladding and core are derived. The coupling mode of long period fiber grating and the principle of double beam interference are introduced. The effects of femtosecond laser energy density and the number of pulses on the diameter of ablative holes in optical fiber are studied and the optimum parameters of laser processing are determined. The single-point microstructures with spacing of 2 渭 m and 5 渭 m were etched in the fiber core by monopulse femtosecond laser. The obtained microstructures were about 7 渭 m in length and 2 渭 m in width. The spectrum and temperature characteristics of fiber microstructures with different spacing were measured. A long-period fiber grating with a length of 200 渭 m, a period of 400um and a total length of 2mm has been fabricated by femtosecond laser transverse direct writing in the fiber core. The etching length is exactly half of the period. The spectral and temperature characteristics were measured and analyzed. In this paper, a method of femtosecond laser interferometric microfabrication using Range grating is proposed. The fiber grating with 20 渭 m period and 12 渭 m period is actually etched. The spectral and temperature characteristics of the processed fiber are studied.
【学位授予单位】：黑龙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN253
【参考文献】
中国硕士学位论文全文数据库 前1条
1 陆君辉;飞秒激光脉冲刻写长周期光纤光栅特性研究[D];上海大学;2011年
，本文编号：2286152
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