線型腔光纖激光器線寬壓窄技術研究
發(fā)布時間：2018-12-17 01:43
【摘要】：線型腔光纖激光器以其體積小、模式穩(wěn)定、易于復用等優(yōu)點在光纖通信、光纖傳感器等領域受到廣泛關注。與環(huán)形腔結構相比,線型腔激光器光譜寬度大,不容易達到k Hz以下,在非等臂干涉系統(tǒng)中將引入較大相位噪聲。本文針對這一背景,對壓窄線型腔激光器線寬、降低相位噪聲的方法進行研究。從理論上分析了激光器線寬與諧振腔結構參數(shù)的關系,揭示了線型腔激光器線寬與光柵特性、諧振腔光子壽命、腔內損耗等多個因素內在聯(lián)系。針對線型腔光纖激光器用切趾光柵、虛擬折疊腔和自注入式復合腔技術展開理論和實驗研究。論文的主要研究成果如下:1.對線型腔光纖激光器用切趾光柵進行了理論和實驗研究。實驗搭建了辛格型變跡切趾光柵制作系統(tǒng),成功實現(xiàn)了切趾光纖的刻寫,實驗獲得了反射率99.999%的超高反射率光柵。2.針對線型腔光纖激光器對兩端光柵波長一致性的要求,提出了額外曝光方法,實現(xiàn)了光纖光柵波長的精確控制,刻寫波長與理想波長誤差控制在0.05nm以內。3.對虛擬折疊腔光纖激光器技術進行了研究。理論分析了虛擬折疊腔弱化空間燒孔、延長光子壽命、壓縮線寬的機理;實驗制作了虛擬折疊腔光纖激光器,解決了快慢軸相對的保偏光柵對和光纖四分之一波片兩個關鍵器件的實驗室制作難題,制作了虛擬折疊腔光纖激光器,從實驗上驗證了該結構對于抑制偏振燒孔、提高諧振腔光子壽命的效果。4.對自注入式復合腔技術進行了研究。通過合理選擇外腔長度和結構,使用1m臂差干涉儀測試相位噪聲降低10dB/Hz~(1/2),線寬實現(xiàn)壓窄。
[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.
【學位授予單位】：國防科學技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248
本文編號：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.
【學位授予單位】：國防科學技術大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248
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