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(jì),沒(méi)有可移動(dòng)部件而可靠性高等優(yōu)點(diǎn)。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(jiǎn)單,斜率效率好,散熱性能優(yōu)良,輸出光束好等優(yōu)點(diǎn)。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(biāo)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(gè)脈沖光纖激光器的性能。因此,對(duì)光纖耦合聲光調(diào)制器進(jìn)行理論和實(shí)驗(yàn)方面的研究就有了一定的實(shí)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(guó)內(nèi)外目前對(duì)聲光器件以及對(duì)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(biāo)。然后,分別從理論和實(shí)驗(yàn)方面進(jìn)行了研究。理論方面:通過(guò)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(shuō)明了三個(gè)主要性能指標(biāo)的影響因素,并對(duì)其進(jìn)行分析。由于它的獨(dú)特的結(jié)構(gòu),還需對(duì)兩個(gè)光纖準(zhǔn)直器的耦合效率理論進(jìn)行研究分析,進(jìn)行模擬仿真。根據(jù)性能指標(biāo)要求,提出對(duì)驅(qū)動(dòng)器的要求,進(jìn)行方案設(shè)計(jì),各個(gè)模塊的設(shè)計(jì),制成電路板并進(jìn)行測(cè)試。實(shí)驗(yàn)方面:根據(jù)前面對(duì)聲光互作用理論的分析,給定加載驅(qū)動(dòng)信號(hào)的聲光晶體。通過(guò)實(shí)驗(yàn)研究了光纖準(zhǔn)直器的光束直徑和光束發(fā)散角對(duì)插損和開(kāi)關(guān)時(shí)間的影響,選取合適的用于耦合的光纖準(zhǔn)直器。最后,對(duì)于給定的聲光晶體,加載驅(qū)動(dòng)信號(hào),選取光束直徑為375um,光束發(fā)散角為2.3mrad的光纖準(zhǔn)直器,對(duì)光纖耦合聲光調(diào)制器進(jìn)行測(cè)試,得到插入損耗為2.3dB,光脈沖上升時(shí)間為60ns,消光比達(dá)到49dB,達(dá)到了設(shè)計(jì)指標(biāo),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(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN761

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