本文選題：非線性光學(xué) + 光參量振蕩�。� 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：光參量振蕩技術(shù)(OPO)是激光頻率轉(zhuǎn)換技術(shù)中重要的組成部分,具有頻率覆蓋范圍廣,能量轉(zhuǎn)換效率高的特點(diǎn),可以靈活地與多種激光器組合形成性能迥異的激光系統(tǒng),其中利用OPO的頻率轉(zhuǎn)換特性產(chǎn)生高功率的可調(diào)諧脈沖光源在光譜檢測(cè)中具有重要應(yīng)用。Nd:YAG主(被)動(dòng)調(diào)Q激光器是典型的高功率脈沖輸出系統(tǒng),廣泛應(yīng)用于各種場(chǎng)合,將其倍頻后產(chǎn)生的532 nm脈沖是常見的可調(diào)諧激光泵浦源,將OPO波長(zhǎng)轉(zhuǎn)換技術(shù)與Nd:YAG倍頻激光器結(jié)合產(chǎn)生近紅外波段的可調(diào)諧脈沖輸出是本文的研究目的。本文研究的主要內(nèi)容如下:1、介紹了非線性過程和晶體物理的相關(guān)理論,利用晶體的Sellmeier色散方程計(jì)算了常見晶體BBO、LBO、Bi BO以及KTP將532 nm光轉(zhuǎn)換為800 nm光的臨界相位匹配角及其對(duì)應(yīng)的有效非線性系數(shù),最終選擇LBO晶體在XY平面的I類相位匹配作為OPO輸出系統(tǒng)的非線性轉(zhuǎn)換晶體;2、模擬計(jì)算了OPO的泵浦光參數(shù)和腔參數(shù)對(duì)OPO輸出閾值和效率的影響,給出了提高OPO信號(hào)能量轉(zhuǎn)換效率的優(yōu)化方法,實(shí)驗(yàn)研究了泵浦增強(qiáng)OPO和無泵浦增強(qiáng)OPO兩種輸出方式,通過對(duì)諧振腔鏡反射率的優(yōu)化組合,最終在泵浦增強(qiáng)OPO中獲得了高達(dá)30%的信號(hào)光能量轉(zhuǎn)換效率;3、根據(jù)晶體的熱光色散方程計(jì)算了溫度對(duì)OPO輸出中心波長(zhǎng)和增益譜寬的影響,給出了OPO溫控系統(tǒng)的參數(shù)要求,最終利用溫度調(diào)諧獲得了760 nm-790nm的近紅外波段輸出,并分析了晶體與泵浦光間角度誤差對(duì)OPO溫度調(diào)諧范圍的影響。
[Abstract]:Optical parametric oscillation (OPO) is an important part of laser frequency conversion technology. It has the characteristics of wide frequency coverage and high energy conversion efficiency. The high power tunable pulse source generated by the frequency conversion characteristic of OPO has important applications in spectral detection. ND: YAG main Q-switched laser is a typical high-power pulse output system, which is widely used in various situations. The 532nm pulse is a common tunable laser pump source. The tunable pulse output in near infrared band is generated by combining the OPO wavelength conversion technique with the Nd:YAG frequency-doubling laser. The main contents of this paper are as follows: 1. The related theories of nonlinear process and crystal physics are introduced. Using the Sellmeier dispersion equation of the crystal, the critical phase matching angle and the corresponding effective nonlinear coefficient of the common crystal BBO-LBO-Bi BO and KTP for converting 532nm light to 800nm light are calculated. Finally, the class I phase matching of LBO crystal in XY plane is chosen as the nonlinear conversion crystal of OPO output system. The effects of pump light parameters and cavity parameters of OPO on the output threshold and efficiency of OPO are simulated and calculated. An optimized method to improve the energy conversion efficiency of OPO signal is presented. Two output modes, pump enhanced OPO and unpumped enhanced OPO, are experimentally studied. The optimum combination of the reflectivity of resonant mirrors is obtained. Finally, 30% of the signal energy conversion efficiency is obtained in pumped enhanced OPO. According to the thermo-optical dispersion equation of the crystal, the influence of temperature on the wavelength and gain spectrum width of the output center of OPO is calculated, and the parameter requirements of the OPO temperature control system are given. Finally, the near infrared band output of 760 nm-790nm is obtained by temperature tuning, and the influence of angle error between crystal and pump light on the tuning range of OPO temperature is analyzed.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN24

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