本文關(guān)鍵詞：中紅外MgO:PPLN晶體光學(xué)參量振蕩器及紅橙光實驗研究　出處：《西北大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

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【摘要】：基于摻氧化鎂周期極化鈮酸鋰(MgO:PPLN)晶體的準相位匹配(Quasi phase matched)中紅外光學(xué)參量振蕩器(Optical parametric oscillator,簡稱OPO)是獲得中紅外激光的重要方法,其參量振蕩過程中產(chǎn)生的中紅外激光以及和頻紅光都具有重大的應(yīng)用價值,相關(guān)研究將對獲得寬調(diào)諧范圍中紅外激光及紅光激光具備一定的指導(dǎo)意義。理論上,文章從三波互作用耦合波方程(Three waves interaction coupled wave equations)出發(fā),對BPM和QPM的基本原理進行了詳細的分析；闡述兩種匹配方法的過程,對比其特點；對基于PPLN的OPO的參量振蕩過程進行了理論分析,解釋了PPLN溫度調(diào)諧原理。實驗研究了808nm側(cè)泵模塊Nd:YAG主動調(diào)Q脈沖激光器的輸出特性,得到連續(xù)(CW)情況下最高功率200W以及調(diào)Q狀態(tài)下186W的1064nm激光高功率輸出。采用1064nm脈沖激光作為泵浦源抽運中紅外OPO系統(tǒng),調(diào)Q頻率設(shè)置為10kHz,非線性晶體采用MgO:PPLN,三塊晶體的極化周期分別為29μm、29.8μm以及30.8μm,調(diào)諧方式采用溫度調(diào)諧(thermal tuning),晶體的溫度變化通過溫控爐連續(xù)調(diào)節(jié),該儀器調(diào)節(jié)精確度為0.1℃,分別獲得了波長范圍為3.758μm-3.932 μm、 3.438μm-3.648μm以及2.940μm-3.140μm的可調(diào)諧中紅外激光輸出,中紅外激光最高輸出功率可達10.29W。最后,實驗研究了光參量振蕩過程中產(chǎn)生的近紅外光與1064nm光的和頻紅光。在泵浦電流不變情況下,通過改變溫控爐溫度控制非線性晶體的溫度連續(xù)調(diào)節(jié),獲得了波長范圍分別為615.2nm-619.2nm、622.4nm-628.8nm以及640.4nm-649.3nm紅光激光可調(diào)諧輸出,獲得了最高功率為1.68W的紅光輸出。
[Abstract]:Quasi phase matched Mid-infrared Optical Parametric oscillator based on MgO-doped periodically polarized Lithium niobate: MgO: PPLN (Quasi-Quasi phase matched) Crystal. Optical parametric oscillator. OPO is an important method to obtain the mid-infrared laser. The mid-infrared laser and the sum-frequency red light produced in the process of parametric oscillation have great application value. The related research will have certain guiding significance for obtaining the infrared laser and the red laser in the wide tuning range. This paper starts from the three waves interaction coupled wave equationsof the three wave interaction coupled wave equation. The basic principles of BPM and QPM are analyzed in detail. The process of the two matching methods is described and the characteristics of the two matching methods are compared. The parametric oscillation process of OPO based on PPLN is theoretically analyzed. The principle of PPLN temperature tuning is explained and the output characteristics of 808nm side pump module Nd:YAG active Q-switched pulse laser are experimentally studied. Continuous CW). The high power output of 1064nm laser with the maximum power of 200W and the Q-switched state of 186W is obtained. The 1064nm pulsed laser is used as the pump source to pump the mid-infrared OPO system. The Q-switched frequency is 10 kHz, the nonlinear crystal is MgO: PPLN, the polarization periods of the three crystals are 29.8 渭 m and 30.8 渭 m, respectively. The temperature change of the crystal is continuously adjusted by a temperature-controlled furnace, and the precision of the instrument is 0.1 鈩，

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