高功率光纖激光相干偏振合成系統(tǒng)研究
發(fā)布時間：2018-07-18 07:53
【摘要】：受限于光纖本身的熱效應(yīng)、非線性效應(yīng)、模式不穩(wěn)定、光纖端面損傷、高亮度泵浦技術(shù)等,單路光纖激光亮度提升能力有限。共孔徑相干合成技術(shù)能獲取更高亮度的激光輸出。就共孔徑相干合成系統(tǒng)而言,其單路高亮度光源的研制和整個合成系統(tǒng)效率的提升是目前相干合成領(lǐng)域的國際難題。本文選取共孔徑相干合成技術(shù)的一種典型代表-相干偏振合成技術(shù)作為研究對象,開展了系統(tǒng)的理論和實驗研究。1、綜合考慮單頻/窄線寬保偏光纖放大器功率提升的兩大主要受限因素—受激布里淵散射效應(yīng)和模式不穩(wěn)定效應(yīng),對實現(xiàn)全光纖結(jié)構(gòu)高亮度、窄線寬、近線偏光纖激光的技術(shù)途徑進行了詳細探索。對比了不同增益介質(zhì)、不同窄線寬種子放大下的亮度提升潛力與受限因素,研究了引入彎曲損耗機理、減小增益光纖纖芯尺寸、改變泵浦波長等模式不穩(wěn)定抑制方法的可行性與適用范圍;在系統(tǒng)研究的基礎(chǔ)上,最終探索得到了實現(xiàn)2 k W級高亮度、窄線寬、近線偏光纖激光輸出的技術(shù)方案。2、綜合考慮實際工程系統(tǒng)中的多種影響因素,對大功率相干偏振合成系統(tǒng)開展了較全面的理論分析和相關(guān)實驗驗證。首先建立了相干偏振合成系統(tǒng)單個合成單元合成效率分析的普適理論模型,分析給出了大陣元合成系統(tǒng)合成效率分析的遞推關(guān)系,在一定近似條件下給出了多路合成系統(tǒng)合成效率分析的近似表達式。隨后,針對大功率相干偏振合成系統(tǒng)的三個重要組成部分—相位與光程控制系統(tǒng)、單元光束、合成元件(光纖端帽、準(zhǔn)直器、半波片、偏振合束器),依次開展了詳細的理論分析,分析給出了大陣元相干偏振合成系統(tǒng)對上述各種影響因素的容忍度�？紤]現(xiàn)有技術(shù)條件,分析指出了大功率、多陣元相干偏振合成系統(tǒng)需研究和論證的關(guān)鍵技術(shù)問題。分析給出了系統(tǒng)主要影響因素對合成效率影響的工程評價方法,并自行設(shè)計實驗完成了驗證。3、針對高功率、大陣元相干偏振合成系統(tǒng)需論證和解決的關(guān)鍵技術(shù)問題開展了較詳細的研究。自行設(shè)計實驗驗證了相位控制系統(tǒng)的矯噪能力,自行設(shè)計實驗測試了高亮度窄線寬保偏放大器的相位噪聲分布特性。論證了自主研制高亮度窄線寬保偏放大器用于高功率相干偏振合成系統(tǒng)的可行性,并提出了系統(tǒng)進一步優(yōu)化的方法。為大功率、多陣元相干偏振合成系統(tǒng)設(shè)計了多路精度梯變式光程控制系統(tǒng),對光程控制系統(tǒng)在復(fù)雜光譜下的可行性進行了初步實驗驗證。在此基礎(chǔ)上,對其用于大功率、多陣元相干偏振合成系統(tǒng)的可行性進行了分析說明,提出了進一步優(yōu)化的方法。設(shè)計實驗對自行研制的高亮度窄線寬保偏放大器的動態(tài)傾斜抖動幅度進行了測試,證明了其能夠用于大功率、多陣元相干偏振合成系統(tǒng)。基于高亮度窄線寬保偏放大器,對合成系統(tǒng)中各個元件的熱透鏡效應(yīng)進行了測試,分析指出商業(yè)化準(zhǔn)直系統(tǒng)的熱透鏡效應(yīng)將嚴(yán)重限制相干偏振合成系統(tǒng)向高功率、大陣元拓展。為了從根本上克服合成元件熱透鏡效應(yīng)對合成效率的影響,從透鏡窗口選取、離焦補償方式選擇等方面進行了深入的研究,在研究的基礎(chǔ)上聯(lián)合研制出了大功率離焦補償性準(zhǔn)直系統(tǒng),并對其離焦補償精度、補償范圍等重要參數(shù)進行了測試,分析論證了其用于大功率、多陣元相干偏振合成系統(tǒng)的可行性。4、構(gòu)建了高功率相干偏振合成系統(tǒng)實驗平臺,開展了不同類型、不同功率水平光纖放大器的相干偏振合成實驗,論證了合成方案在單頻激光、皮秒脈沖激光、窄線寬激光和多波長激光方面的亮度提升能力,通過系統(tǒng)優(yōu)化不斷推動合成方案邁向了新的發(fā)展水平。結(jié)合理論模型和工程評價方法,對系統(tǒng)輸出特性進行了詳細分析。以高功率實驗結(jié)果為參考,分析指明了系統(tǒng)進一步優(yōu)化的方向,并為相關(guān)系統(tǒng)進一步優(yōu)化的目標(biāo)提供了理論參考。
[Abstract]:Limited to the thermal effect of the fiber itself, the nonlinear effect, the mode instability, the optical fiber end face damage, the high brightness pumping technology, and so on, the luminance enhancement ability of the single optical fiber laser is limited. The common aperture coherent synthesis technology can obtain the higher brightness laser output. The enhancement of the efficiency of the system is an international problem in the field of coherent synthesis. In this paper, a typical representative coherent polarization synthesis technology is selected as the research object, and the theoretical and experimental study of.1 is carried out. The two major constraints of the single frequency / narrow linewidth preserving optical fiber amplifier are taken into consideration. With the effect of stimulated Brillouin scattering and unstable mode, the technical way to realize high brightness, narrow line width and near line biased optical fiber laser is explored in detail. The potential and limited factors of luminance enhancement under different gain medium and different narrow linewidth seed amplification are compared, and the mechanism of bending loss is introduced, Jian Xiaozeng is introduced. On the basis of the system research, the technical scheme for realizing high brightness, narrow linewidth and near line partial optical fiber laser output of 2 K W is finally explored on the basis of the system research, and a variety of influence factors in the real engineering system are taken into consideration, and the high power coherence is taken into consideration. A comprehensive theoretical analysis and experimental verification are carried out in the polarization synthesis system. First, a universal theory model for the synthesis efficiency analysis of a single synthesis unit in the coherent polarization synthesis system is established. The recurrence relation of the synthesis efficiency analysis of the large array synthesis system is given, and the synthesis system is synthesized under certain approximate conditions. The approximate expression of the efficiency analysis is followed. Then, for the three important components of the high power coherent polarization synthesis system, the phase and optical path control system, the unit beam, the synthetic element (fiber end cap, collimator, half wave, polarization beam splitter), the detailed theoretical analysis is carried out in turn, and the coherent polarization synthesis system of large array element is analyzed and given. The tolerance of the various factors mentioned above. Considering the existing technical conditions, the key technical problems needed to be studied and demonstrated in the high power, multi array element coherent polarization synthesis system are analyzed. The engineering evaluation method of the influence of the main factors on the synthesis efficiency is given, and the self line design experiment has completed the verification of.3 for high power, The key technical problems of the large array coherent polarization synthesis system need to be demonstrated and solved in more detail. The noise correction ability of the phase control system is verified by self design experiment. The phase noise distribution characteristic of the high brightness and narrow line width preserving amplifier is tested by self design experiment. The independent development of high brightness and narrow line width is proved. The feasibility of the large power coherent polarization synthesis system for high power and the method of further optimization of the system are proposed. The multi-channel precision ladder optical path control system is designed for the high-power, multi array element coherent polarization synthesis system. The feasibility of the optical path control system under the complex spectrum is preliminarily verified. The feasibility of the coherent polarization synthesis system for large power and multi array elements is analyzed and illustrated, and a further optimization method is proposed. The design experiment is used to test the dynamic tilt dither amplitude of the self developed high brightness narrow line width preserving amplifier. It is proved that it can be used in the high power, multi array element coherent polarization synthesis system. The thermal lensing effect of various components in the synthetic system is tested by a high luminance narrow line width biased amplifier. The analysis indicates that the thermal lens effect of the commercialized collimation system will severely limit the coherent polarization synthesis system to high power and large array expansion. The selection of the mirror window and the selection of the defocus compensation are deeply studied. On the basis of the research, a high-power defocusing collimating collimating system is developed, and the important parameters such as the defocus compensation precision and the compensation range are tested, and the feasibility of the system is proved to be used for the coherent polarization synthesis system of high power and multi array element. .4, the experimental platform of high power coherent polarization synthesis system is constructed, and the coherent polarization synthesis experiments of different types and different power level fiber amplifiers are carried out. The luminance enhancement capability of the synthetic scheme in single frequency laser, picosecond pulse laser, narrow linewidth laser and multi wavelength laser is demonstrated, and the synthesis is continuously promoted through system optimization. The scheme moves towards the new level of development. Combining the theoretical model and the engineering evaluation method, the output characteristics of the system are analyzed in detail. The results of high power experiment are taken as reference, the direction of the further optimization of the system is pointed out, and the theoretical reference for the further optimization of the related systems is provided.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN253
，
本文編號：2131240
[Abstract]:Limited to the thermal effect of the fiber itself, the nonlinear effect, the mode instability, the optical fiber end face damage, the high brightness pumping technology, and so on, the luminance enhancement ability of the single optical fiber laser is limited. The common aperture coherent synthesis technology can obtain the higher brightness laser output. The enhancement of the efficiency of the system is an international problem in the field of coherent synthesis. In this paper, a typical representative coherent polarization synthesis technology is selected as the research object, and the theoretical and experimental study of.1 is carried out. The two major constraints of the single frequency / narrow linewidth preserving optical fiber amplifier are taken into consideration. With the effect of stimulated Brillouin scattering and unstable mode, the technical way to realize high brightness, narrow line width and near line biased optical fiber laser is explored in detail. The potential and limited factors of luminance enhancement under different gain medium and different narrow linewidth seed amplification are compared, and the mechanism of bending loss is introduced, Jian Xiaozeng is introduced. On the basis of the system research, the technical scheme for realizing high brightness, narrow linewidth and near line partial optical fiber laser output of 2 K W is finally explored on the basis of the system research, and a variety of influence factors in the real engineering system are taken into consideration, and the high power coherence is taken into consideration. A comprehensive theoretical analysis and experimental verification are carried out in the polarization synthesis system. First, a universal theory model for the synthesis efficiency analysis of a single synthesis unit in the coherent polarization synthesis system is established. The recurrence relation of the synthesis efficiency analysis of the large array synthesis system is given, and the synthesis system is synthesized under certain approximate conditions. The approximate expression of the efficiency analysis is followed. Then, for the three important components of the high power coherent polarization synthesis system, the phase and optical path control system, the unit beam, the synthetic element (fiber end cap, collimator, half wave, polarization beam splitter), the detailed theoretical analysis is carried out in turn, and the coherent polarization synthesis system of large array element is analyzed and given. The tolerance of the various factors mentioned above. Considering the existing technical conditions, the key technical problems needed to be studied and demonstrated in the high power, multi array element coherent polarization synthesis system are analyzed. The engineering evaluation method of the influence of the main factors on the synthesis efficiency is given, and the self line design experiment has completed the verification of.3 for high power, The key technical problems of the large array coherent polarization synthesis system need to be demonstrated and solved in more detail. The noise correction ability of the phase control system is verified by self design experiment. The phase noise distribution characteristic of the high brightness and narrow line width preserving amplifier is tested by self design experiment. The independent development of high brightness and narrow line width is proved. The feasibility of the large power coherent polarization synthesis system for high power and the method of further optimization of the system are proposed. The multi-channel precision ladder optical path control system is designed for the high-power, multi array element coherent polarization synthesis system. The feasibility of the optical path control system under the complex spectrum is preliminarily verified. The feasibility of the coherent polarization synthesis system for large power and multi array elements is analyzed and illustrated, and a further optimization method is proposed. The design experiment is used to test the dynamic tilt dither amplitude of the self developed high brightness narrow line width preserving amplifier. It is proved that it can be used in the high power, multi array element coherent polarization synthesis system. The thermal lensing effect of various components in the synthetic system is tested by a high luminance narrow line width biased amplifier. The analysis indicates that the thermal lens effect of the commercialized collimation system will severely limit the coherent polarization synthesis system to high power and large array expansion. The selection of the mirror window and the selection of the defocus compensation are deeply studied. On the basis of the research, a high-power defocusing collimating collimating system is developed, and the important parameters such as the defocus compensation precision and the compensation range are tested, and the feasibility of the system is proved to be used for the coherent polarization synthesis system of high power and multi array element. .4, the experimental platform of high power coherent polarization synthesis system is constructed, and the coherent polarization synthesis experiments of different types and different power level fiber amplifiers are carried out. The luminance enhancement capability of the synthetic scheme in single frequency laser, picosecond pulse laser, narrow linewidth laser and multi wavelength laser is demonstrated, and the synthesis is continuously promoted through system optimization. The scheme moves towards the new level of development. Combining the theoretical model and the engineering evaluation method, the output characteristics of the system are analyzed in detail. The results of high power experiment are taken as reference, the direction of the further optimization of the system is pointed out, and the theoretical reference for the further optimization of the related systems is provided.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：TN253
，
本文編號：2131240
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