本文選題：光纖激光器 + 飽和吸收體　； 參考：《湖南大學(xué)》2015年碩士論文

【摘要】：被動鎖模光纖激光器具有穩(wěn)定性好、效率高、系統(tǒng)緊湊等優(yōu)勢,在光纖通信、遙感、激光雷達(dá)、光譜分析和軍事等方面具有廣泛應(yīng)用,是目前超快激光研究的熱點(diǎn)之一。為了獲得高峰值功率、超快的鎖模激光輸出,光纖激光器的諧振腔和光學(xué)元件需要仔細(xì)選擇。其中,可飽和吸收體是被動鎖模光纖激光器中的關(guān)鍵器件,它要求非線性材料具有可控的非線性吸收能力、快的響應(yīng)和低的損耗。除此之外,調(diào)制深度也是可飽和吸收體的關(guān)鍵參數(shù)之一,高的調(diào)制深度可以增強(qiáng)消減脈沖邊緣的效果,有利于獲得超短脈沖,而且可以有效提高超快激光器的穩(wěn)定性。本論文圍繞如何獲得短脈沖、穩(wěn)定工作的被動鎖模光纖激光器,理論結(jié)合實(shí)驗(yàn)研究了高調(diào)制深度飽和吸收體對被動鎖模光纖激光器輸出特性的影響。主要工作如下:第一,數(shù)值模擬了光通信波段可飽和吸收體參數(shù)對被動鎖模光纖激光器輸出特性的影響,并基于拓?fù)浣^緣體可飽和吸收體實(shí)現(xiàn)了亞皮秒的超快激光輸出�；贕inzburg-Landau方程,數(shù)值模擬了可飽和吸收體對被動鎖模光纖激光器輸出特性的影響�；贐i2Te3可飽和吸收體,設(shè)計并搭建了被動鎖模摻Er的環(huán)形腔光纖激光器,并實(shí)現(xiàn)穩(wěn)定的脈沖輸出。泵浦功率到達(dá)85.4 m W時,光纖激光器進(jìn)入自啟動的狀態(tài);泵浦功率調(diào)至500 m W時,我們獲得重復(fù)頻率為13.14 MHz、脈寬約505 fs的鎖模孤子脈沖輸出。通過不斷調(diào)控偏振控制器,觀察到光纖激光器輸出脈沖的中心波長能夠在1570.45到1572.32 nm之間連續(xù)調(diào)諧。第二,數(shù)值模擬了近零色散情況下?lián)戒A被動鎖模光纖激光器的輸出特性,為優(yōu)化設(shè)計中紅外超快光纖激光器提供了指導(dǎo)�；贕inzburg-Landau方程,數(shù)值研究了飽和吸收體參數(shù)(調(diào)制深度、飽和功率和非飽和吸收損耗等)對被動鎖模光纖激光器輸出脈沖特性的影響。在諧振腔凈腔色散為 0.008 ps2時,獲得了穩(wěn)定的孤子脈沖輸出。數(shù)值模擬結(jié)果表明:高調(diào)制深度、低飽和功率的飽和吸收體能夠得到更窄的孤子脈沖。
[Abstract]:Passive mode-locked fiber laser has the advantages of good stability, high efficiency and compact system. It has been widely used in optical fiber communication, remote sensing, lidar, spectral analysis and military. In order to obtain high peak power and ultra-fast mode-locked laser output, the resonator and optical components of fiber laser need to be carefully selected. The saturable absorber is the key device in the passive mode-locked fiber laser. It requires the nonlinear material to have controllable nonlinear absorption ability, fast response and low loss. In addition, modulation depth is also one of the key parameters of saturable absorber. High modulation depth can enhance the effect of reducing pulse edge, which is helpful to obtain ultrashort pulse, and can effectively improve the stability of ultra-fast laser. In this paper, the effect of high modulation depth saturated absorber on the output characteristics of passive mode-locked fiber laser with short pulse and stable operation is studied theoretically and experimentally. The main work is as follows: first, the influence of saturable absorber parameters in optical communication band on the output characteristics of passive mode-locked fiber laser is numerically simulated, and the subpicosecond ultra-fast laser output is realized based on the topologically insulator saturable absorber. Based on Ginzburg-Landau equation, the effect of saturable absorber on the output characteristics of passive mode-locked fiber laser is numerically simulated. Based on the Bi2Te3 saturable absorber, a passively mode-locked er doped ring cavity fiber laser is designed and constructed, and the stable pulse output is realized. When the pump power reaches 85.4 MW, the fiber laser enters the state of self-start, and when the pump power is adjusted to 500MW, we obtain a mode-locked soliton pulse with a repetition rate of 13.14 MHz and a pulse width of about 505 fs. By continuously adjusting the polarization controller, it is observed that the central wavelength of the output pulse of the fiber laser can be continuously tuned from 1570.45 nm to 1572.32 nm. Secondly, the output characteristics of thulium doped passively mode-locked fiber laser with near-zero dispersion are numerically simulated, which provides guidance for optimizing the design of ultra-fast infrared fiber laser. Based on Ginzburg-Landau equation, the effects of saturation absorber parameters (modulation depth, saturation power and unsaturated absorption loss) on the output pulse characteristics of passive mode-locked fiber laser are numerically studied. A stable soliton pulse output is obtained when the cavity dispersion is 0.008 ps2. Numerical simulation results show that a narrower soliton pulse can be obtained by a saturated absorber with high modulation depth and low saturation power.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN248

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