线型腔光纤激光器线宽压窄技术研究
发布时间：2018-12-17 01:43
【摘要】：线型腔光纤激光器以其体积小、模式稳定、易于复用等优点在光纤通信、光纤传感器等领域受到广泛关注。与环形腔结构相比,线型腔激光器光谱宽度大,不容易达到k Hz以下,在非等臂干涉系统中将引入较大相位噪声。本文针对这一背景,对压窄线型腔激光器线宽、降低相位噪声的方法进行研究。从理论上分析了激光器线宽与谐振腔结构参数的关系,揭示了线型腔激光器线宽与光栅特性、谐振腔光子寿命、腔内损耗等多个因素内在联系。针对线型腔光纤激光器用切趾光栅、虚拟折叠腔和自注入式复合腔技术展开理论和实验研究。论文的主要研究成果如下:1.对线型腔光纤激光器用切趾光栅进行了理论和实验研究。实验搭建了辛格型变迹切趾光栅制作系统,成功实现了切趾光纤的刻写,实验获得了反射率99.999%的超高反射率光栅。2.针对线型腔光纤激光器对两端光栅波长一致性的要求,提出了额外曝光方法,实现了光纤光栅波长的精确控制,刻写波长与理想波长误差控制在0.05nm以内。3.对虚拟折叠腔光纤激光器技术进行了研究。理论分析了虚拟折叠腔弱化空间烧孔、延长光子寿命、压缩线宽的机理;实验制作了虚拟折叠腔光纤激光器,解决了快慢轴相对的保偏光栅对和光纤四分之一波片两个关键器件的实验室制作难题,制作了虚拟折叠腔光纤激光器,从实验上验证了该结构对于抑制偏振烧孔、提高谐振腔光子寿命的效果。4.对自注入式复合腔技术进行了研究。通过合理选择外腔长度和结构,使用1m臂差干涉仪测试相位噪声降低10dB/Hz~(1/2),线宽实现压窄。
[Abstract]:Linear cavity fiber laser is widely concerned in optical fiber communication, fiber sensor and other fields because of its small size, stable mode, easy to reuse and so on. Compared with the ring cavity structure, the spectral width of the linear cavity laser is larger than that of the ring cavity laser, and it is not easy to reach below k Hz. A large phase noise will be introduced in the non-equiarm interference system. In this paper, the method of reducing phase noise and linewidth of a narrow-line cavity laser is studied. The relationship between the linewidth of the laser and the structural parameters of the resonator is analyzed theoretically, and the internal relations between the linewidth of the linear cavity laser and the grating characteristics, the photon lifetime of the resonator and the loss in the cavity are revealed. The theoretical and experimental research on digital grating virtual folded cavity and self-injection compound cavity for linear cavity fiber laser is carried out. The main research results are as follows: 1. The theoretical and experimental study of apodized grating used in linear cavity fiber laser is carried out. An experimental system for fabricating Singer tapered apodized grating is established, and the apodized fiber is successfully written. A high reflectivity grating with a reflectivity of 99.999% is obtained. 2. According to the requirement of wavelength consistency between the two ends of the fiber laser, an extra exposure method is proposed to control the wavelength of the fiber grating accurately. The error between the writing wavelength and the ideal wavelength is controlled within 0.05nm. The technology of virtual folded cavity fiber laser is studied. The mechanism of weakening the space hole burning, prolonging the photon life and compressing the linewidth of the virtual folded cavity is analyzed theoretically. Virtual folded cavity fiber laser is fabricated experimentally, which solves the problem of laboratory fabrication of two key devices, namely, the polarization-maintaining grating pair relative to the fast and slow axis and the fiber 1/4 wave plate, and the virtual folded cavity fiber laser is fabricated. The experimental results show that the structure can restrain the polarization hole burning and improve the photon lifetime of the resonator. 4. The technique of self-injection compound cavity is studied. By selecting the length and structure of the external cavity reasonably, the phase noise is reduced by 10 dB / Hz1 / 2 by using 1m arm differential interferometer, and the line width is reduced.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
本文编号：2383424
[Abstract]:Linear cavity fiber laser is widely concerned in optical fiber communication, fiber sensor and other fields because of its small size, stable mode, easy to reuse and so on. Compared with the ring cavity structure, the spectral width of the linear cavity laser is larger than that of the ring cavity laser, and it is not easy to reach below k Hz. A large phase noise will be introduced in the non-equiarm interference system. In this paper, the method of reducing phase noise and linewidth of a narrow-line cavity laser is studied. The relationship between the linewidth of the laser and the structural parameters of the resonator is analyzed theoretically, and the internal relations between the linewidth of the linear cavity laser and the grating characteristics, the photon lifetime of the resonator and the loss in the cavity are revealed. The theoretical and experimental research on digital grating virtual folded cavity and self-injection compound cavity for linear cavity fiber laser is carried out. The main research results are as follows: 1. The theoretical and experimental study of apodized grating used in linear cavity fiber laser is carried out. An experimental system for fabricating Singer tapered apodized grating is established, and the apodized fiber is successfully written. A high reflectivity grating with a reflectivity of 99.999% is obtained. 2. According to the requirement of wavelength consistency between the two ends of the fiber laser, an extra exposure method is proposed to control the wavelength of the fiber grating accurately. The error between the writing wavelength and the ideal wavelength is controlled within 0.05nm. The technology of virtual folded cavity fiber laser is studied. The mechanism of weakening the space hole burning, prolonging the photon life and compressing the linewidth of the virtual folded cavity is analyzed theoretically. Virtual folded cavity fiber laser is fabricated experimentally, which solves the problem of laboratory fabrication of two key devices, namely, the polarization-maintaining grating pair relative to the fast and slow axis and the fiber 1/4 wave plate, and the virtual folded cavity fiber laser is fabricated. The experimental results show that the structure can restrain the polarization hole burning and improve the photon lifetime of the resonator. 4. The technique of self-injection compound cavity is studied. By selecting the length and structure of the external cavity reasonably, the phase noise is reduced by 10 dB / Hz1 / 2 by using 1m arm differential interferometer, and the line width is reduced.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248
【参考文献】
相关期刊论文 前4条
1 曹春燕;姚琼;饶伟;胡永明;;窄线宽激光器线宽的非平衡光纤干涉仪测量法[J];中国激光;2011年05期
2 申人升;张玉书;杜国同;;光纤激光器研究进展[J];半导体光电;2009年01期
3 洪从胜,徐新华,吕昌贵,徐春祥,崔一平;切趾光纤光栅技术及其研究进展[J];光电子技术与信息;2002年03期
4 俞本立,钱景仁,罗家童,孙志培,杨瀛海;线宽小于0.5kHz稳态的单频光纤环形腔激光器[J];量子电子学报;2001年04期
相关博士学位论文 前2条
1 牛嗣亮;光纤法布里—珀罗水听器技术研究[D];国防科学技术大学;2011年
2 马丽娜;光纤激光水听器技术[D];国防科学技术大学;2010年
，本文编号：2383424
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2383424.html
