軸對稱矢量光束光纖激光器脈沖產(chǎn)生及效率增強
[Abstract]:Axisymmetric vector beam is an axisymmetric solution of the distribution of electric field on the center point on the cross section of the beam. It is an axisymmetric solution of the full vector electromagnetic wave equation. The common two axisymmetric vector beams have two kinds of distribution of radial and angular polarization beams. This kind of beam can be obtained by active or passive methods. The technology of its manipulation has also been developed. The singular polarization characteristics of such beams lead to special large numerical aperture focusing characteristics, which are very important in the field of high-precision imaging, metal processing and particle manipulation. The LP11 mode in the less mode fiber consists of four degenerate modes (TM01, TE01, HE21even, HE21odd), which are four. The model shows axisymmetric polarization, in which TM01 and TE01 correspond to radial and angular polarization respectively. Using dislocation coupling or long period Prague grating can realize the excitation of LP11 mode in the less mode fiber, but it is difficult to obtain the mode output of high purity while ensuring the coupling efficiency. Therefore, the optical fiber grating is based on the less mode fiber Bragg grating. The mode selection scheme is proposed for high-purity axisymmetric vector beam generation. In this paper, we introduce the mathematical characteristics and various generation methods of axisymmetric vector beams. Based on the optical fiber mode theory, the reflection and mode selection theory of the small mode fiber Bragg gratings are elaborated in detail. The research subject gets the National Natural Science Foundation. The main research work and results are as follows: 1. the pulse output of the axisymmetric vector beam is realized by adding an electro-optic modulator in a fiber laser with a staggered coupling cascaded less mode fiber Bragg grating. The experimental pulse is obtained. The impulse axisymmetric vector beam has a heavy frequency 12.059MHz and a pulse width of 2ns, and the laser is working in the single wavelength range of the very narrow line width and the 30dB spectrum width 0.2nm, which greatly guarantees the mode purity of the output axisymmetric vector beam,.2. is based on the saturated absorption characteristic of the carbon nanotube, and the ultra short pulse passive mode locking output of the axisymmetric vector beam is realized. The carbon nanotube with high damage threshold, wide working wavelength and independent polarization can realize self starting passive mode locking as an intracavity saturable absorber. The ultrashort pulse output of the radial polarization beam is realized by adjusting the PC of the cavity, and the mode locked pulse heavy frequency 10.61MHz is obtained, and the output spectrum of the laser is very good under the pulse width 22.73ps. mode. Limited to the base mode reflection peak of the less mode fiber Bragg grating, the mode purity of the radial polarization beam calculated by the 30dB output spectrum width 0.3nm. through the mode integration method is 98.03%.3. in the full mode double Prague reflective fiber laser using the gain saturation in the double cladding Ytterbium fiber and the transverse field space burning caused by the transverse mode longitudinal beat frequency. The output efficiency of the axisymmetric vector beam is greatly enhanced by the long period grating. When the pump reaches a threshold, the output efficiency of the laser is changed from 13.36% to 32.48%. At the same time, we use this kind of photoinduced long period grating mechanism and the rate equation to verify the effect of its effect on the laser resonance. According to the conclusion that is consistent with the experimental results, and the operation of the laser in the LP01 and LP11 modes is obtained in the laser, two wide spectrum pattern response devices are designed to get rid of the width of the reflection spectrum of the small mode fiber Bragg grating. Based on the mode coupling theory, the scheme of mode selection coupler is proposed and the fiber melting is used. The mode of the taper has preliminarily verified the rationality of the theory. In addition, a coupling theory based on the PLC waveguide coupling is designed and a coupling theory based on the coherent superposition of mode transmission is proposed. In addition, the wide spectrum angular polarization selection output is realized by the cladding metallized fiber formed by the optical fiber taper coating, and the numerical simulation is carried out by numerical simulation. The effects of cone thickness, metal film thickness and working wavelength on different modes loss are studied in detail. The main innovations of this paper are as follows: 1. using an electro-optical modulator to combine the dislocation coupled cascaded small mode fiber Bragg grating, the active mode locked output.2. selection loss of the axis to the vector beam is realized at the same time in the narrow spectrum operation of the laser. The carbon nanotube with high injury threshold and wide working wavelength and independent polarization is used as an intracavity saturable absorber, realizing the self starting narrow spectrum lock mode of the fiber laser, and using the small mode fiber Bragg grating to realize the ultra short pulse output.3. of the axisymmetric vector beam in the double cladding Ytterbium doped fiber laser with the full mode double Prague reflective fiber laser. The long period grating in the transverse field caused by the gain saturation and the transverse mode longitudinal beat frequency has realized the output of the axisymmetric vector beam with greatly enhanced resonant efficiency. The effect of the pattern distortion to the laser resonance is verified by the rate equation and the long period of light induced by the numerical simulation. The conclusion is consistent with the experimental results.
【學(xué)位授予單位】:中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:TN248
【相似文獻】
相關(guān)期刊論文 前10條
1 ;110W光纖激光器[J];激光與光電子學(xué)進展;2000年09期
2 楊青,俞本立,甄勝來,孫志培,吳海濱;光纖激光器的發(fā)展現(xiàn)狀[J];光電子技術(shù)與信息;2002年05期
3 朱萬彬,潘玉寨,楊慶鑫,王立軍;光纖激光器的發(fā)展[J];光機電信息;2002年04期
4 曉晨;2002年光纖激光器研究與應(yīng)用最新進展研討會[J];激光與光電子學(xué)進展;2002年08期
5 譚中偉,傅永軍,劉艷,寧提綱,裴麗,簡水生;光纖激光器研究和進展[J];現(xiàn)代有線傳輸;2002年01期
6 譚中偉,劉艷,傅永軍,寧提綱,裴麗,簡水生;光纖激光器的混沌現(xiàn)象分析[J];中國激光;2003年04期
7 ;光纖激光器[J];光機電信息;2003年06期
8 宋曉舒;光纖激光器在空軍中的應(yīng)用[J];光機電信息;2003年11期
9 張德龍;具有潛在工業(yè)應(yīng)用前景的光纖激光器[J];光機電信息;2004年03期
10 劉美紅;共摻驅(qū)動2μm光纖激光器[J];激光與光電子學(xué)進展;2004年11期
相關(guān)會議論文 前10條
1 吳文華;冉洋;熊松松;陳鑫;;光纖激光器的醫(yī)療應(yīng)用研究[A];2009年先進光學(xué)技術(shù)及其應(yīng)用研討會論文集(上冊)[C];2009年
2 陳曉燕;;光纖激光器的發(fā)展與應(yīng)用[A];中國電子學(xué)會第十三屆電子元件學(xué)術(shù)年會論文集[C];2004年
3 曲宙;李秋實;曲偉;趙崇光;;淺析高功率光纖激光器的應(yīng)用[A];科技創(chuàng)新與節(jié)能減排——吉林省第五屆科學(xué)技術(shù)學(xué)術(shù)年會論文集(上冊)[C];2008年
4 閆大鵬;李成;李立波;劉曉旭;;大功率光纖激光器的產(chǎn)業(yè)化國產(chǎn)化解決方案[A];科技引領(lǐng)產(chǎn)業(yè)、支撐跨越發(fā)展——第六屆湖北科技論壇論文集萃[C];2011年
5 劉俊剛;羅君;歐代永;;光纖激光器的發(fā)展動態(tài)和應(yīng)用前景[A];全國第十二次光纖通信暨第十三屆集成光學(xué)學(xué)術(shù)會議論文集[C];2005年
6 王志華;;光纖激光器應(yīng)用綜述[A];上海市激光學(xué)會2005年學(xué)術(shù)年會論文集[C];2005年
7 侯靜;肖瑞;陳子倫;張斌;;3路光纖激光器陣列相干合成輸出[A];中國光學(xué)學(xué)會2006年學(xué)術(shù)大會論文摘要集[C];2006年
8 劉艷格;董孝義;袁樹忠;開桂云;劉波;付圣貴;王志;;全光纖激光器與放大器研究(特邀)[A];中國光學(xué)學(xué)會2006年學(xué)術(shù)大會論文摘要集[C];2006年
9 季恒;楊四剛;尹飛飛;謝世鐘;;一種基于等效相移的新型雙波長光纖激光器[A];全國第十三次光纖通信暨第十四屆集成光學(xué)學(xué)術(shù)會議論文集[C];2007年
10 劉雪明;;光克爾效應(yīng)的能量自穩(wěn)定理論及在光纖激光器的應(yīng)用[A];全國第十三次光纖通信暨第十四屆集成光學(xué)學(xué)術(shù)會議論文集[C];2007年
相關(guān)重要報紙文章 前10條
1 戴勁松;具有國際先進水平的光纖激光器問世[N];大眾科技報;2007年
2 記者 涂亞卓 通訊員 廖巧玲 實習(xí)生 余笑寒;高性能光纖激光器開發(fā)成功[N];湖北日報;2008年
3 戴勁松;我國自主研發(fā)高性能光纖激光器打破國際壟斷格局[N];大眾科技報;2008年
4 本報記者 胡Z,
本文編號:2129502
本文鏈接:http://www.wukwdryxk.cn/shoufeilunwen/xxkjbs/2129502.html