本文關(guān)鍵詞：全固態(tài)1.3μm自鎖模激光器　出處：《北京交通大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 自鎖模 皮秒 Nd:YVO_4 Nd:GdVO_4 有效性非線性變量

【摘要】：皮秒脈沖在非線性頻率變換、工業(yè)加工、光譜學、光生物學、醫(yī)療診斷等領(lǐng)域都有著非常廣泛的應(yīng)用,自鎖模作為一種實現(xiàn)皮秒脈沖輸出的新型的技術(shù)手段,目前已經(jīng)成為國內(nèi)外研究的熱點。它具有裝置簡單、抗損傷閾值高、成本低、可靠性高、波長范圍廣、脈寬窄等優(yōu)點。在皮秒自鎖模領(lǐng)域,目前主要集中于1.0μm波段的研究,1.3μm波段研究的比較少。但是1.3μm波段脈沖激光器在光譜學、光纖通信、紅外光學參量振蕩等領(lǐng)域都有著重要的應(yīng)用。其倍頻紅光更廣泛用于光生物學和光醫(yī)學領(lǐng)域,特別是熒光的觀測和成像領(lǐng)域。因此,本文就1.3μm皮秒自鎖模脈沖激光器展開研究。本文分別采用Nd:YV04和Nd:GdV04作為增益介質(zhì),利用激光介質(zhì)的三階非線性效應(yīng)結(jié)合增益光闌形成類可飽和吸收體,實現(xiàn)1.3μm連續(xù)鎖模皮秒激光輸出。全文具體的內(nèi)容如下:第一、介紹了添加脈沖鎖模、半導體可飽和吸收體反射鏡鎖模、自鎖模三種連續(xù)鎖模技術(shù)及其發(fā)展概況,闡述了 1.3μm脈沖激光器的研究意義及其發(fā)展情況。第二、研究了自鎖模無像差理論,并根據(jù)克爾效應(yīng)原理,對軟硬光闌的脈沖壓縮機制予以闡述。在此基礎(chǔ)上探究了有效非線性變量對于鎖模的自啟動及穩(wěn)定輸出的影響。第三、實驗采用Nd:YVO4作為激光晶體,研究了不同腔型的1342nm皮秒鎖模激光輸出。在此基礎(chǔ)上,通過對比不同泵浦光斑下的鎖模波形,研究了泵浦模式與激光模式的比例對鎖模脈沖輸出的影響。當泵浦功率為10W時,輸出脈沖的平均功率可以達到1.34W,相應(yīng)的光光轉(zhuǎn)換效率以及斜效率分別13.4%,17.5%。其重復頻率為1.48GHz,單脈沖能量約為0.91nJ。第四、在研究Nd:GdV04熱效應(yīng)及有效非線性變量的基礎(chǔ)上,首次實現(xiàn)了1341nmNd:GdVO4瓦級皮秒自鎖模激光器的運轉(zhuǎn),同時探究了有效性非線性變量對于連續(xù)鎖模穩(wěn)定性的影響。其光光轉(zhuǎn)換效率以及斜效率可達到16.7%、19.2%,重復頻率為2.0GHz,脈沖寬度可達到9.1ps,單脈沖能量約為1.26nJ,峰值功率約為 137.9W。
[Abstract]:Picosecond pulse is widely used in the fields of nonlinear frequency conversion, industrial processing, spectroscopy, photobiology, medical diagnosis and so on. Self-mode-locking is a new technique to realize picosecond pulse output. It has many advantages such as simple device, high damage threshold, low cost, high reliability, wide wavelength range, narrow pulse width and so on. It is in the field of picosecond self-mode-locking. At present, the research focused on 1.0 渭 m band is less than 1.3 渭 m band, but 1.3 渭 m band pulse laser is in spectroscopy, optical fiber communication. Infrared optical parametric oscillation and other fields have important applications. Its frequency-doubling red light is more widely used in the field of photobiology and photomedicine, especially in the field of fluorescence observation and imaging. In this paper, a 1.3 渭 m picosecond self-mode-locked pulse laser is studied. Nd:YV04 and Nd:GdV04 are used as gain medium respectively. Using the third-order nonlinear effect of laser medium and gain aperture to form a saturable absorber, 1.3 渭 m continuous mode-locked picosecond laser output is realized. The main contents are as follows: 1. Three kinds of continuous mode-locking techniques, such as pulse mode-locking, semiconductor saturable absorber mirror mode-locking and self-mode-locking, are introduced. The significance and development of 1.3 渭 m pulsed laser are described. Secondly, the theory of self-mode-locked aberration is studied, and the Kerr effect principle is used. The pulse compressor system with soft and hard apertures is described. On this basis, the effect of effective nonlinear variables on the self-starting and stable output of mode-locking is explored. Thirdly, Nd:YVO4 is used as laser crystal in the experiment. The output of 1342 nm picosecond mode-locked laser with different cavity types is studied. On this basis, the mode-locked waveforms under different pump spot are compared. The effect of the ratio of pump mode to laser mode on the output of mode-locked pulse is studied. When the pump power is 10 W, the average power of output pulse can reach 1.34 W. The corresponding optical conversion efficiency and oblique efficiency are 13.4and 17.5.The repetition rate is 1.48GHz, and the single pulse energy is about 0.91nJ. 4th. Based on the study of Nd:GdV04 thermal effect and effective nonlinear variables, the operation of 1341 nm ND: GdVO4 picosecond self-mode-locked laser is realized for the first time. At the same time, the effect of effective nonlinear variables on the stability of continuous mode-locking is investigated. The optical and optical conversion efficiency and skew efficiency can reach 16.7GHz and 19.2GHz, and the repetition rate is 2.0GHz. The pulse width can reach 9.1 ps.Monopulse energy is about 1.26 nJ, and the peak power is about 137.9 W.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN248

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