本文選題：光纖激光器 + 相干坍塌�。� 參考：《國防科學技術(shù)大學》2016年博士論文

【摘要】：基于光纖光柵的分布反饋(Distributed Feedback,DFB)光纖激光器具備良好的激光輸出特性和突出的本征波分復用性能,是構(gòu)造多波長光纖激光傳感陣列的良好載體,在光纖傳感領(lǐng)域具有廣泛的應(yīng)用前景。目前已報道的DFB光纖激光器陣列最大規(guī)模僅為16基元,激光器陣列的相干坍塌效應(yīng)是進一步擴大陣列規(guī)模的主要限制因素,腔外信號光及泵浦光注入是影響激光器基元噪聲性能的重要因素。本文對DFB光纖激光器陣列中影響各激光器性能的關(guān)鍵物理問題進行研究,為擴展DFB光纖激光器陣列規(guī)模提供支撐。與獨立工作的光纖激光器不同,DFB光纖激光器陣列中任一激光器都受到同頻相干光反饋、非同頻信號光注入以及泵浦光注入等因素影響,成為導致激光器基元性能惡化、陣列規(guī)模受限的主要原因。論文針對同頻相干光反饋問題,研究相干坍塌對DFB光纖激光器陣列的影響及其抑制方法;針對非同頻信號光注入問題,研究用于陣列功率整形的環(huán)境不敏感型長周期光纖光柵;針對泵浦光注入問題,研究泵浦致熱引起的有源相移光柵非線性啁啾,以及DFB光纖激光器的熱致失諧特性。此外,針對DFB光纖激光器陣列在高溫極限條件的潛在應(yīng)用需求,對摻雜光纖和長周期光纖光柵的高溫特性進行系統(tǒng)測試。論文的主要研究成果和創(chuàng)新點如下:1、建立了基于雙端耦合的二基元DFB光纖激光器陣列相干坍塌復合腔模型,提出基于相干坍塌特性的非對稱DFB光纖激光器相移位置測量方法,通過優(yōu)化陣列結(jié)構(gòu)可使光纖激光器陣列長度增大近50m,為抑制相干坍塌效應(yīng)、提高DFB光纖激光器陣列規(guī)模提供了一種可行途徑。2、采用波導結(jié)構(gòu)設(shè)計和低溫退火技術(shù)在單模光纖上制作了同時對溫度和應(yīng)變不敏感的長周期光纖光柵,并觀測到低溫退火引起的波導結(jié)構(gòu)納米量級徑向尺寸變化,為DFB光纖激光器陣列強度噪聲優(yōu)化設(shè)計提供支撐。3、實驗測量了泵浦致熱引起的有源相移光柵啁啾和DFB光纖激光器湮滅,得到了非線性熱致失諧等效物理圖像,提出基于泵浦調(diào)制的有源相移光柵相移補償方法,為DFB光纖激光器陣列泵浦功率分配及各激光器性能優(yōu)化提供指導。4、實驗測量到摻雜光纖的高溫增益恢復現(xiàn)象,實現(xiàn)長周期光纖光柵的高溫再生,能夠通過再生光柵分段線性溫度響應(yīng)確定光纖各波導層特征溫度,為DFB光纖激光器陣列在高溫極限條件的潛在應(yīng)用提供實驗基礎(chǔ)。
[Abstract]:Distributed feedback distributed feedback DFB (DFB) fiber lasers based on fiber Bragg gratings have good laser output characteristics and outstanding intrinsic wavelength division multiplexing performance, so they are a good carrier for constructing multi-wavelength fiber laser sensor arrays. It has a wide application prospect in the field of optical fiber sensing. The largest scale of DFB fiber laser array reported at present is only 16 primitives, and the coherent collapse effect of the laser array is the main limiting factor for further expanding the array size. Extracavity signal light and pump beam injection are important factors that affect the noise performance of laser elements. In this paper, the key physical problems affecting the performance of DFB fiber laser arrays are studied, which provide support for expanding the scale of DFB fiber laser arrays. Different from the independent fiber laser, any laser in the DFB fiber laser array is affected by the coherent feedback of the same frequency, the optical injection of the nonidentical frequency signal and the injection of the pump light, which leads to the deterioration of the performance of the laser unit. The main reason for the limitation of array size. In this paper, the effect of coherent collapse on DFB fiber laser array and its suppression method are studied, and the environmentally insensitive long-period fiber grating for power shaping is studied. The nonlinear chirp caused by pump heat and the thermal detuning of DFB fiber laser are studied. In addition, the high temperature characteristics of doped fiber and long period fiber gratings are systematically tested for the potential applications of DFB fiber laser arrays in high temperature limit conditions. The main achievements and innovations of this paper are as follows: 1. A two-element DFB fiber array coherent collapse compound cavity model based on two-terminal coupling is established, and a phase shift measurement method for asymmetric DFB fiber laser based on coherent collapse characteristic is proposed. By optimizing the array structure, the length of the fiber laser array can be increased by nearly 50 ms. in order to suppress the coherent collapse effect, A feasible way to improve the scale of DFB fiber laser array is provided. Using waveguide structure design and low temperature annealing technique, long period fiber gratings are fabricated on a single mode fiber, which is not sensitive to temperature and strain at the same time. The nanoscale radial size change of waveguide structure caused by low temperature annealing is also observed. This paper provides support for the optimal design of intensity noise of DFB fiber laser array. The chirp of active phase shift grating caused by pump heat and the annihilation of DFB fiber laser are experimentally measured, and the equivalent physical image of nonlinear thermal detuning is obtained. An active phase-shifted grating phase shift compensation method based on pump modulation is proposed, which provides guidance for the pump power distribution of DFB fiber laser array and the performance optimization of each laser. The high temperature gain recovery phenomenon of doped fiber is measured experimentally. In order to realize the high temperature regeneration of long-period fiber grating, the characteristic temperature of each waveguide layer can be determined by the piecewise linear temperature response of the regenerated grating, which provides the experimental basis for the potential application of DFB fiber laser array in the high temperature limit condition.
【學位授予單位】：國防科學技術(shù)大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TN248
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本文編號：1859601