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

【摘要】：區(qū)別于自由空間調制器,光纖耦合聲光調制器具有低插入損耗,結構緊湊,體積小,密封設計,沒有可移動部件而可靠性高等優(yōu)點。隨著激光技術和光纖技術的發(fā)展,光纖耦合聲光調制器憑借著其優(yōu)異性,正廣泛的應用于脈沖光纖激光器,光纖放大器,脈沖采集器等領域中。和傳統(tǒng)的半導體激光器相比,光纖激光器具有結構簡單,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制器是應用于1064nm的10W/20W打標用脈沖光纖激光器中,作為其中的關鍵調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構以及光纖耦合聲光調制器在其中所起的作用。論述了國內外目前對聲光器件以及對光纖耦合聲光調制器的研究現(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制器的結構組成,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。由于它的獨特的結構,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。根據性能指標要求,提出對驅動器的要求,進行方案設計,各個模塊的設計,制成電路板并進行測試。實驗方面:根據前面對聲光互作用理論的分析,給定加載驅動信號的聲光晶體。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,達到了設計指標,應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.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN761

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