本文選題：單縱模 + 固體激光器��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：自從激光器誕生以來,國防建設(shè)、工業(yè)生產(chǎn)、信息通訊等對激光器的需求不斷上升。特別是具有高能量、高重復(fù)頻率、高穩(wěn)定性和光束質(zhì)量的固體激光器,在激光光譜學(xué)、光參量振蕩器泵浦、激光誘導(dǎo)等離子體、激光雷達(dá)慣性約束核聚變有著不可取代的作用。而這些激光器都需要一個穩(wěn)定、高效的種子源,即單獨(dú)的一個單縱模激光器模塊。本文首先介紹了單縱模固體激光器的國內(nèi)外研究進(jìn)展,分析了目前單縱模固體激光器的整體發(fā)展情況和趨勢,以及在應(yīng)用上的不足,提出了本文的主要研究內(nèi)容。然后由瓊斯矩陣推導(dǎo)并驗證了扭擺結(jié)構(gòu)對空間燒孔效應(yīng)的解決。從整體上對腔內(nèi)反轉(zhuǎn)粒子數(shù)的分布和調(diào)制深度進(jìn)行研究,得到了不考慮輸出鏡透過率情況下的最優(yōu)調(diào)Q晶體透過率。結(jié)合加入衍射損耗的調(diào)Q的速率方程的計算仿真,得到了與國外理論研究符合的調(diào)Q輸出參數(shù)的變化趨勢。根據(jù)腔內(nèi)的振蕩頻譜的特性,驗證方法的可行性。其次,設(shè)計了不同的振蕩器結(jié)構(gòu),驗證不同腔型對扭擺腔結(jié)構(gòu)有不同的匹配程度。通過改變調(diào)Q晶體透過率、扭擺結(jié)構(gòu)的波片角度、腔長和重復(fù)頻率,得到了和理論相符合的結(jié)果。最后,該諧振腔得到了單脈沖能量9.7mJ,脈沖寬度10.07ns,重復(fù)頻率在1~5Hz可調(diào)的的激光脈沖,M2因子在x和y軸分別為1.23和1.47,單縱模幾率大于98%。對該脈沖利用折返池SBS結(jié)構(gòu)成功的將諧振腔輸出光束壓縮至500ps,能量反射率為22.2%。結(jié)合兩種技術(shù)能夠為工業(yè)生產(chǎn)和科學(xué)實驗提供峰值功率更高的單縱模激光器。
[Abstract]:Since the birth of lasers, the demand for lasers has been increasing in national defense construction, industrial production, information communication and so on. In particular, solid-state lasers with high energy, high repetition rate, high stability and beam quality play an irreplaceable role in laser spectroscopy, optical parametric oscillator pumping, laser-induced plasma and inertial confinement fusion of lidar. These lasers require a stable and efficient seed source, that is, a single longitudinal mode laser module. This paper first introduces the research progress of single longitudinal mode solid-state lasers at home and abroad, analyzes the overall development and trend of single-longitudinal-mode solid-state lasers at present, as well as their shortcomings in application, and puts forward the main research contents of this paper. Then the solution of space hole burning effect of torsion pendulum structure is deduced and verified by Jones matrix. The distribution and modulation depth of the number of inversion particles in the cavity are studied as a whole, and the optimal transmittance of Q-switched crystal is obtained without considering the transmittance of the output mirror. Combined with the calculation and simulation of the rate equation of Q-switched with the addition of diffraction loss, the variation trend of the Q-switched output parameters in accordance with the theoretical research abroad is obtained. The feasibility of the method is verified according to the characteristics of the intracavity oscillation spectrum. Secondly, different oscillator structures are designed to verify that different cavity types have different matching degree for torsion pendulum cavity structure. By changing the transmittance of Q-switched crystal, the wave plate angle, cavity length and repetition frequency of the torsion pendulum structure, the theoretical results are obtained. Finally, the single pulse energy is 9.7 MJ, the pulse width is 10.07 ns, the M _ 2 factor of laser pulse with tunable repetition rate at 1~5Hz is 1.23 and 1.47 in x and y axis, and the probability of single longitudinal mode is greater than 98. The output beam of the resonator is compressed to 500psusing the SBS structure of the reentrant cell, and the energy reflectivity is 22.22. The combination of two techniques can provide a single longitudinal mode laser with higher peak power for industrial production and scientific experiments.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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