本文關(guān)鍵詞：石墨烯鎖模摻鉺光纖激光器的研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光纖激光器 石墨烯 可飽和吸收體 被動鎖模 分步傅里葉變換

【摘要】：光纖通信在最近幾十年快速發(fā)展,已經(jīng)深入日常生活的方方面面。而光纖通信的理想光源就是激光,同時光纖具有體積小、損耗低等優(yōu)點(diǎn),所以關(guān)于光纖激光器方面的研究大量涌現(xiàn),并且取得喜人的成果。但是隨著科技的進(jìn)一步發(fā)展,傳統(tǒng)的光纖激光器因其脈沖寬度的限制而不能攜帶更多的信息而逐漸不能滿足日益增長的社會需要。因此,超快激光器又成為研究的熱點(diǎn),與此同時,石墨烯的出現(xiàn)為鎖模激光器提供了新型的飽和吸收材料,其飽和吸收特性可以進(jìn)行鎖模進(jìn)而使光脈沖壓窄,甚至可以達(dá)到飛秒級。在此背景下,作者采用石墨烯作為可飽和吸收體,研究石墨烯鎖模光纖激光器的輸出特性以及模型仿真,具體做了如下工作:在實(shí)驗方面,首先采用改進(jìn)脈沖激光沉積法將石墨烯轉(zhuǎn)移到光纖連接頭上。改進(jìn)脈沖激光沉積法是將光纖連接頭一端浸于石墨烯溶液中,光纖連接頭的另一端通過耦合器接到泵浦激光器上,保持功率恒定輸出數(shù)分鐘后,功率計的讀數(shù)突然有一個跳變,這時說明石墨烯已經(jīng)附著在光纖連接頭的端口處,沉積已經(jīng)完成。其次則是搭建了環(huán)形光纖激光器,在環(huán)形腔內(nèi)引入石墨烯可飽和吸收體后,適當(dāng)調(diào)節(jié)偏振控制器,激光器就有穩(wěn)定光孤子脈沖輸出。輸出的脈沖寬度為皮秒級,脈沖間隔為520 ns,重復(fù)頻率為1.92 MHz,射頻譜的幅值為75 dB,中心波長在1557.3 nm,并且光譜兩翼位置出現(xiàn)Kelly邊帶,輸出功率為3.2 mW。在理論研究方面,則是應(yīng)用麥克斯韋方程組建立描述本實(shí)驗的方程,通過此方程來仿真石墨烯鎖模摻鉺光纖激光器的輸出特性。方程推導(dǎo)的主要步驟是,先將麥克斯韋方程組化簡為波動方程,然后對波動方程做傅里葉變換,分離出與幅度相關(guān)的縱模信息,再將縱模按泰勒公式展開到二階,最后再做反傅里葉變換就可以得到所需的方程。在推導(dǎo)方程的過程中,我們采用的四個化簡條件使方程更簡潔、更容易求解。由此仿真得到了四個結(jié)論,這四個結(jié)論從時域和頻域兩方面驗證了實(shí)驗的輸出特性。最后,在時域上對比實(shí)驗和仿真,證明了輸出的脈沖為孤子脈沖;在頻域上分析了Kelly邊帶產(chǎn)生的原因,并且將實(shí)驗輸出的光譜形狀與仿真得到光譜形狀進(jìn)行了對比,兩者基本吻合。實(shí)驗總體達(dá)到了預(yù)期效果,理論仿真也對實(shí)驗的正確性進(jìn)行了驗證。
[Abstract]:The rapid development of optical fiber communication in recent decades, has penetrated every aspect of daily life. And the optical fiber communication and optical fiber laser is the ideal light source, has the advantages of small size, low loss, so the research on fiber lasers have emerged, and made gratifying achievements. But with the further development of science and technology, the traditional optical fiber laser because of the pulse width limit and can not carry more information and gradually cannot meet the growing needs of the society. Therefore, ultrafast laser also has become a hot research topic, at the same time, the appearance of graphene mode-locked lasers offer new saturable absorption materials, the absorption can be locked and the light pulse narrow, can even reach the femtosecond level. Under this background, the author using graphene as a saturable absorber, of mode-locked fiber lasers with graphene Output characteristics and simulation model, the specific contents are as follows: in the experiment, the improvement of pulsed laser deposition of graphene will be transferred to the optical fiber connector. The improved pulsed laser deposition is the optical fiber connector end immersed in graphene solution, the other end of the optical fiber connector through the coupler to the pump laser. Maintain a constant output power after a few minutes, the power meter readings suddenly have a jump, then that graphene has been attached to the port in the optical fiber connector, deposition has been completed. The second is the ring fiber laser was constructed. The introduction of graphene saturable absorber in the annular cavity after adjusting the polarization controller, a laser will the stable soliton pulse output. The output pulse width for picosecond, pulse interval of 520 ns, the repetition rate is 1.92 MHz, the amplitude of the RF spectrum is 75 dB, 1557 in the center wavelength .3, nm, and Kelly spectra of the wing positions sideband, the output power is 3.2 mW. in the aspect of theory research, it is the application of Maxwell equation to describe the equation, through this equation to simulate the output characteristics of graphene mode-locked erbium-doped fiber laser. The main steps of the equation is the Maxwell equations. The simplification for the wave equation, then Fu Liye transform of wave equation, isolated longitudinal mode information and amplitude correlation, then the longitudinal model according to the Taylor formula to order two, and finally do the inverse Fu Liye transform can get the desired range. In the equation, we use the four. Simple conditions make the equation more concise, easier to solve. This simulation has got four conclusions, these four conclusions verify the output characteristics experiment from two aspects of time domain and frequency domain. Finally, in the time domain contrast experiment and simulation, proved The output pulse for soliton pulse in frequency domain; analyzed the reason of Kelly band is generated, and the spectral shape and the spectral shape of simulation output are compared, the basic agreement between the two. The overall experiment achieves the desired results, the correctness of the theory simulation experiment is verified.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248

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