本文選題：光纖耦合聲光調(diào)制器 + 光纖激光器��； 參考：《河北工業(yè)大學(xué)》2015年碩士論文

【摘要】：區(qū)別于自由空間調(diào)制器,光纖耦合聲光調(diào)制器具有低插入損耗,結(jié)構(gòu)緊湊,體積小,密封設(shè)計,沒有可移動部件而可靠性高等優(yōu)點。隨著激光技術(shù)和光纖技術(shù)的發(fā)展,光纖耦合聲光調(diào)制器憑借著其優(yōu)異性,正廣泛的應(yīng)用于脈沖光纖激光器,光纖放大器,脈沖采集器等領(lǐng)域中。和傳統(tǒng)的半導(dǎo)體激光器相比,光纖激光器具有結(jié)構(gòu)簡單,斜率效率好,散熱性能優(yōu)良,輸出光束好等優(yōu)點。本文所要研究的光纖耦合聲光調(diào)制器是應(yīng)用于1064nm的10W/20W打標用脈沖光纖激光器中,作為其中的關(guān)鍵調(diào)Q器件,它的性能好壞影響著整個脈沖光纖激光器的性能。因此,對光纖耦合聲光調(diào)制器進行理論和實驗方面的研究就有了一定的實際意義。首先介紹了常用的光纖激光器的結(jié)構(gòu)以及光纖耦合聲光調(diào)制器在其中所起的作用。論述了國內(nèi)外目前對聲光器件以及對光纖耦合聲光調(diào)制器的研究現(xiàn)狀,分析了其中的差距,制定出所要研制的光纖耦合調(diào)制器的性能指標。然后,分別從理論和實驗方面進行了研究。理論方面:通過分析光纖耦合聲光調(diào)制器的結(jié)構(gòu)組成,以及聲光相互作用的理論,定性地說明了三個主要性能指標的影響因素,并對其進行分析。由于它的獨特的結(jié)構(gòu),還需對兩個光纖準直器的耦合效率理論進行研究分析,進行模擬仿真。根據(jù)性能指標要求,提出對驅(qū)動器的要求,進行方案設(shè)計,各個模塊的設(shè)計,制成電路板并進行測試。實驗方面:根據(jù)前面對聲光互作用理論的分析,給定加載驅(qū)動信號的聲光晶體。通過實驗研究了光纖準直器的光束直徑和光束發(fā)散角對插損和開關(guān)時間的影響,選取合適的用于耦合的光纖準直器。最后,對于給定的聲光晶體,加載驅(qū)動信號,選取光束直徑為375um,光束發(fā)散角為2.3mrad的光纖準直器,對光纖耦合聲光調(diào)制器進行測試,得到插入損耗為2.3dB,光脈沖上升時間為60ns,消光比達到49dB,達到了設(shè)計指標,應(yīng)用到脈沖光纖激光器中,性能良好。
[Abstract]:Different from free space modulator, optical fiber coupling acousto-optic modulator has the advantages of low insertion loss, compact structure, small size, sealed design, no movable parts and high reliability.With the development of laser technology and optical fiber technology, fiber coupling acousto-optic modulator is widely used in pulsed fiber laser, fiber amplifier, pulse collector and so on.Compared with conventional semiconductor lasers, fiber lasers have the advantages of simple structure, good slope efficiency, excellent heat dissipation and good output beam.The fiber coupling acoustooptic modulator is used in 1064nm 10W/20W marking pulsed fiber laser. As a key Q-switched device, its performance affects the performance of the whole pulse fiber laser.Therefore, the theoretical and experimental study of optical fiber coupling acoustooptic modulator has certain practical significance.Firstly, the structure of fiber laser and the function of fiber coupling acoustooptic modulator are introduced.The present research status of acoustooptic devices and optical fiber coupling acousto-optic modulators at home and abroad is discussed. The gap between them is analyzed and the performance indexes of the fiber optic coupling modulators are worked out.Then, the theoretical and experimental studies are carried out respectively.In theory: by analyzing the structure of optical fiber coupling acousto-optic modulator and the theory of acousto-optic interaction, the influencing factors of three main performance indexes are explained qualitatively and analyzed.Because of its unique structure, the coupling efficiency theory of two optical fiber collimators should be studied and simulated.According to the requirement of performance index, the requirement of driver is put forward, the scheme design, the design of each module, the circuit board and test are made.Experiment: according to the previous analysis of acousto-optic interaction theory, the acousto-optic crystal with driving signal is given.The influence of beam diameter and beam divergence angle on insertion loss and switching time of optical fiber collimator is studied experimentally. A suitable optical fiber collimator for coupling is selected.Finally, for a given acousto-optic crystal, the optical fiber collimator whose beam diameter is 375um and beam divergence angle 2.3mrad is selected to test the optical fiber coupling acousto-optic modulator.The results show that the insertion loss is 2.3 dB, the rising time of optical pulse is 60 ns, the extinction ratio is 49 dB, and the design index is reached. The performance of the laser is good when it is applied to pulsed fiber laser.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN761

【參考文獻】

相關(guān)期刊論文 前4條

1 郭雄英;楊玲珍;賀虎成;曹玲;王云才;;8字形腔波長可調(diào)諧鎖模脈沖光纖激光器[J];光子學(xué)報;2008年02期

2 張彩;黃永梅;亓波;邊疆;吳瓊雁;;基于液晶空間光調(diào)制器的光束偏轉(zhuǎn)控制[J];中國激光;2011年09期

3 張俊,黃欹昌,陸f ,劉漢珍;三點式晶體振蕩電路的起振特性與調(diào)節(jié)技術(shù)[J];自動化與儀器儀表;2005年05期

4 鮑鈺文;徐瑤;張金輝;高云;;高性能晶體振蕩器及頻率校準電路設(shè)計[J];現(xiàn)代電子技術(shù);2014年09期

，

本文編號：1755363