本文關(guān)鍵詞：中紅外連續(xù)運轉(zhuǎn)光學參量振蕩器　出處：《北京理工大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 光學參量振蕩器 準相位匹配 信號光單諧振 中紅外激光

【摘要】：3-5μm波段中紅外連續(xù)相干光源在遙感、醫(yī)療、光譜分析、無線光通信及軍事領(lǐng)域有著重要的應(yīng)用價值和發(fā)展前景。全固態(tài)的光學參量振蕩器具有結(jié)構(gòu)緊湊、穩(wěn)定性高、效率高、閾值低、調(diào)諧范圍寬等優(yōu)點，成為產(chǎn)生中紅外激光輸出最有效的手段之一。 本文研究了以1064nm光纖放大器為泵浦源、以摻雜MgO的周期極化鈮酸鋰晶體(PPMgLN)為非線性介質(zhì)的中紅外連續(xù)運轉(zhuǎn)(CW)光學參量振蕩器(OPO)。通過對系統(tǒng)的優(yōu)化設(shè)計，采用信號光單諧振（SRO）方式實現(xiàn)了低閾值、大功率的中紅外激光輸出。 本文綜述了國內(nèi)外中紅外OPO的研究現(xiàn)狀及發(fā)展趨勢，著重對中紅外連續(xù)運轉(zhuǎn)OPO的非線性晶體特性、諧振方式及獲得單頻輸出的方法進行了分析和比較。 針對信號光單諧振光學參量振蕩器進行了理論研究，建立了準相位匹配(QPM)的波長調(diào)諧計算模型及基于三波耦合方程組的振蕩閾值及轉(zhuǎn)換效率理論模型，計算了單程光參量增益、振蕩條件和振蕩閾值、輸出功率和轉(zhuǎn)換效率；理論分析了相位失配產(chǎn)生的主要原因及其對OPO輸出特性的影響。 基于理論計算結(jié)果及光學諧振腔的穩(wěn)定條件，完成了兩鏡直線腔OPO的設(shè)計；考慮了像散的影響，完成了bow-tie結(jié)構(gòu)的四鏡環(huán)形腔OPO設(shè)計。 搭建了兩鏡直線腔OPO和bow-tie環(huán)形腔OPO實驗系統(tǒng)，并對其輸出特性進行了測試與分析。直線型OPO的閾值僅為1.35W，當泵源功率為18W時獲得的閑頻光輸出功率為3.2W，波長為3.2μm，譜線寬度約為15nm。通過改變晶體的工作溫度和極化周期，輸出閑頻光的波長調(diào)諧范圍為2.9-3.8μm。環(huán)型腔OPO的工作閾值約為3W，當工作于3.4μm時可獲得2.6W的閑頻光輸出。與直線腔相比，環(huán)形腔的輸出光譜較窄，僅為1.6nm。通過對腔內(nèi)振蕩信號光進行選頻，可獲得單頻中紅外激光輸出。
[Abstract]:3-5 渭 m infrared continuous coherent light source in remote sensing, medical, spectral analysis. The all-solid-state optical parametric oscillator has the advantages of compact structure, high stability, high efficiency, low threshold and wide tuning range. It has become one of the most effective means to produce mid-infrared laser output. In this paper, 1064nm fiber amplifier is used as pump source. The optical parametric oscillator with MgO doped periodically poled lithium niobate crystal (PPMgLN) as a nonlinear medium has been optimized. The low threshold and high power output of mid-infrared laser is realized by using signal-light single resonance resonator (SRO). In this paper, the research status and development trend of mid-infrared OPO at home and abroad are reviewed, with emphasis on the nonlinear crystal characteristics of OPO with medium-infrared continuous operation. The resonant mode and the method of obtaining single frequency output are analyzed and compared. The signal optical single resonance optical parametric oscillator is studied theoretically. The wavelength tuning calculation model of quasi phase matched QPMs and the theoretical model of oscillation threshold and conversion efficiency based on three wave coupling equations are established. The single pass optical parameter gain, oscillation condition and oscillation threshold are calculated. Output power and conversion efficiency; The main causes of phase mismatch and its influence on the output characteristics of OPO are analyzed theoretically. Based on the theoretical calculation results and the stability conditions of the optical resonator, the design of the two-mirror linear cavity OPO is completed, and the OPO design of the four-mirror ring cavity with bow-tie structure is completed considering the influence of astigmatism. The experimental system of two-mirror linear cavity OPO and bow-tie ring cavity OPO is built, and its output characteristics are tested and analyzed. The threshold of linear OPO is only 1.35W. When the pump power is 18 W, the output power of idler frequency light is 3.2 W, the wavelength is 3.2 渭 m, and the spectral line width is about 15 nm. The wavelength tuning range of the output idler light is 2.9-3.8 渭 m. The operating threshold of the ring cavity OPO is about 3W, and the output of the idling frequency light is 2.6 W when working at 3.4 渭 m, which is compared with the linear cavity. The output spectrum of the ring cavity is only 1.6 nm. By selecting the frequency of the intracavity oscillatory signal, the output of the single frequency mid-infrared laser can be obtained.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN753.91

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本文編號：1414316