本文關(guān)鍵詞： 石墨烯/氧化石墨烯可飽和吸收體 摻鐿光纖 諧波鎖模 耗散孤子共振 多波長耗散孤子　出處：《深圳大學》2015年碩士論文　論文類型：學位論文

【摘要】：脈沖光纖激光器不僅可以產(chǎn)生高峰值功率的光脈沖,而且具有結(jié)構(gòu)緊湊、光束質(zhì)量好、無需調(diào)試、價格便宜等優(yōu)點。氧化石墨烯作為石墨烯的衍生物,不僅有著可與石墨烯媲美的光學特性,如帶寬可調(diào)諧、高損傷閾值以及與波長無關(guān)的光吸收特性等優(yōu)點,而且價格低廉、易制取。基于氧化石墨烯可飽和吸收體鎖模的脈沖光纖激光器是研究非線性光學現(xiàn)象最有力的平臺之一,其現(xiàn)象包括諧波鎖模、耗散孤子共振、多波長鎖模等,它們在生物成像、光通訊、光學探測、材料處理、光學微加工、光學測量、光傳感、光信號處理等方面都有著廣泛的應用。本論文以氧化石墨烯被動鎖模全正常色散摻鐿光纖激光器為研究平臺,實驗上探究了該激光器的幾種不同工作模式,并從理論上解釋了這些模式出現(xiàn)的原因。本文的具體工作內(nèi)容如下:1.介紹了幾種鎖模光纖激光器的鎖模方式及特點,重點講述了石墨烯及氧化石墨烯作為可飽和吸收體應用于鎖模光纖激光器的研究進展。2.分析了石墨烯的能帶結(jié)構(gòu),并闡述了石墨烯的可飽和吸收原理。對氧化石墨烯的光學特性也做了介紹,說明氧化石墨烯也是一種優(yōu)越的可飽和吸收體,可以與石墨烯相媲美。3.介紹了石墨烯的制作方法。討論了一種本論文實驗所用的漸變薄膜型氧化石墨烯的制作方法,且測量了其線性透過率和可飽和吸收特性。4.基于氧化石墨烯可飽和吸收體搭建了摻鐿光纖激光器,不僅實現(xiàn)了重復頻率為1.062 MHz的穩(wěn)定基頻皮秒鎖模,而且還獲得了不同階數(shù)的諧波鎖模。通過調(diào)節(jié)泵浦功率和改變腔內(nèi)偏振態(tài),可以實現(xiàn)不同階數(shù)的諧波鎖模,最高階數(shù)為309階(328 MHz)。實驗中還研究了光譜寬度與諧波鎖模階數(shù)的關(guān)系。5.基于漸變薄膜型石墨烯可飽和吸收體,在摻鐿光纖激光器中觀察到了耗散孤子共振現(xiàn)象。通過增加泵浦功率,未分裂的矩形脈沖的寬度能夠從3.2 ns增加到7.4 ns,且脈沖振幅保持不變,基頻約為1.072 MHz。在最大泵浦功率500 m W下,輸出單脈沖能量達到2.43 n J,腔內(nèi)脈沖能量達到9.7 n J。實驗中,還研究了耗散孤子共振脈沖寬度、光譜寬度、單脈沖能量、輸出功率隨泵浦功率的變化關(guān)系。6.通過基于漸變薄膜型氧化石墨烯可飽和吸收體搭建的摻鐿光纖激光器,實現(xiàn)了結(jié)構(gòu)簡單、緊湊的全光纖化可調(diào)諧單波長、可調(diào)諧可切換雙波長、穩(wěn)定三波長的耗散孤子鎖模摻鐿光纖激光器。單波長耗散孤子可調(diào)諧的波長寬度為16.4nm(1051.8 nm~1068.2 nm),鎖模信噪比大于65 d B。雙波長耗散孤子不僅波長范圍可調(diào)(約10 nm),而且波長間距也是可調(diào)的(3.8 nm~13.8 nm),鎖模信噪比大于62d B。此外,還研究了多波長耗散孤子形成的機制。
[Abstract]:Pulsed fiber laser not only can produce high peak power optical pulse, but also has the advantages of compact structure, good beam quality, no need of debugging, low price and so on. Graphene oxide is a derivative of graphene. It not only has the advantages of comparable optical properties as graphene, such as tunable bandwidth, high damage threshold and wavelength independent optical absorption, but also low price. Pulse fiber laser based on graphene oxide saturable absorber mode-locking is one of the most powerful platforms to study nonlinear optical phenomena, including harmonic mode-locking, dissipative soliton resonance, multi-wavelength mode-locking and so on. They are used in biological imaging, optical communication, optical detection, material processing, optical microprocessing, optical measurement, optical sensing. Optical signal processing has been widely used in this paper. In this paper, based on graphene oxide passively mode-locked fully normal dispersion doped ytterbium-doped fiber laser as a research platform, several different working modes of the laser have been explored experimentally. The main work of this paper is as follows: 1. The mode and characteristics of several mode-locked fiber lasers are introduced. The progress in the application of graphene and graphene oxide as saturable absorbers in mode-locked fiber lasers is described. 2. The energy band structure of graphene is analyzed. The principle of saturable absorption of graphene is described. The optical properties of graphene oxide are also introduced, which indicates that graphene oxide is also a superior saturable absorber. The preparation method of graphene is introduced, and a method of making graphene oxide film is discussed in this paper. The linear transmittance and saturable absorption.4. Yb-doped fiber laser was built based on graphene oxide saturable absorber. Not only the picosecond mode-locking with a repetition rate of 1.062 MHz is realized, but also the harmonic mode-locking with different order is obtained. The pump power is adjusted and the polarization state in the cavity is changed. Different order harmonic mode-locking can be realized. The relationship between spectral width and harmonic mode-locked order. 5. Based on the gradual film graphene saturable absorber. The dissipative soliton resonance is observed in ytterbium-doped fiber laser. By increasing the pump power, the width of unsplit rectangular pulse can be increased from 3.2 ns to 7.4 ns. The pulse amplitude remains constant, the fundamental frequency is about 1.072 MHz. At the maximum pump power of 500 MW, the output single pulse energy reaches 2.43 nJ. In the experiment, the pulse width, spectral width and single pulse energy of dissipative soliton are also studied. The relationship between output power and pump power. 6. Yb-doped fiber laser with simple structure and compact all-fiber tunable single wavelength is realized by means of ytterbium-doped fiber laser based on gradual thin film graphene oxide saturable absorber. Tunable and switchable dual wavelengths. A dissipative soliton mode-locked ytterbium-doped fiber laser with three stable wavelengths has a tunable wavelength width of 16.4 nm ~ 1051.8 nm~1068.2 ~ (-1). The signal-to-noise ratio (SNR) of mode-locking is greater than 65 dB. The dual wavelength dissipative soliton is not only adjustable in wavelength range (about 10 nm), but also has adjustable wavelength spacing (3. 8 nm~13.8 / nm). The signal-to-noise ratio (SNR) of mode-locking is greater than 62 dB. In addition, the mechanism of multi-wavelength dissipative soliton formation is studied.
【學位授予單位】：深圳大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248

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