本文選題：2μm激光器 + Ho:SSO激光介質(zhì)��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：2μm波段處于大氣窗口,是眾多原子和分子(如H2O等)的吸收峰,且處于人眼安全波段。2μm激光器還可以作為中遠(yuǎn)紅外波段激光OPO的泵浦源。因此2μm波段激光在軍事國防、工農(nóng)業(yè)生產(chǎn)等方面具有重要的應(yīng)用價(jià)值。本文對新型Ho:SSO激光器的輸出特性開展了研究,以期為相關(guān)領(lǐng)域的拓展做出貢獻(xiàn)。首先,闡述了2μm波段激光器的發(fā)展現(xiàn)狀與應(yīng)用前景,通過對不同基質(zhì)的摻Ho~(3+)離子固體激光器的介紹和對比,指出2μm硅酸鹽激光器的優(yōu)勢。同時(shí),介紹了近五年來摻Ho~(3+)離子固體激光被動(dòng)調(diào)Q運(yùn)轉(zhuǎn)的發(fā)展?fàn)顩r,指出Cr~(2+):ZnS晶體作為被動(dòng)Q開關(guān)在中紅外激光器中的應(yīng)用價(jià)值與發(fā)展?jié)摿ΑＦ浯?介紹了Ho:SSO晶體的物化特性與光譜特性,根據(jù)其吸收光譜和發(fā)射光譜,得到其吸收、發(fā)射截面,并計(jì)算了Ho:SSO晶體的強(qiáng)度參數(shù),并從理論上分析了不同反轉(zhuǎn)粒子數(shù)比率下Ho:SSO的增益截面,討論其可能的振蕩波長。建立了Ho:SSO激光器的準(zhǔn)二能級(jí)速率方程模型,結(jié)合其晶體參數(shù),對速率方程進(jìn)行數(shù)值求解,為單端泵浦Ho:SSO激光器的設(shè)計(jì)奠定理論基礎(chǔ)。再次,討論了諧振腔腔長和輸出鏡曲率對Ho:SSO激光器諧振腔內(nèi)振蕩光斑分布的影響,為單端泵浦Ho:SSO激光器的設(shè)計(jì)提供理論依據(jù)。結(jié)合理論計(jì)算,對Ho:SSO激光器進(jìn)行設(shè)計(jì),討論了輸出鏡透過率、諧振腔長度、Ho:SSO增益介質(zhì)溫度對激光器輸出性能的影響。在輸出鏡透過率為T=20%、曲率R=-100mm,諧振腔長度L=60mm,晶體溫度為290K時(shí),獲得最大輸出功率1.71W;晶體溫度為281K時(shí),得到最大輸出功率2.1W,連續(xù)運(yùn)轉(zhuǎn)激光輸出波長為2113.5nm。最后,對Ho:SSO固體激光器的被動(dòng)調(diào)Q輸出特性進(jìn)行了探究。首先介紹了Cr~(2+):ZnS晶體的物化特性和光譜特性,分析其作為2μm波段激光器的被動(dòng)調(diào)Q開關(guān)的可行性。再從理論上建立摻Ho~(3+)調(diào)Q激光器的速率方程模型,理論分析被動(dòng)Q開關(guān)的工作過程。在實(shí)驗(yàn)上,探究了Ho:SSO固體激光器被動(dòng)調(diào)Q脈沖運(yùn)轉(zhuǎn)過程中各參數(shù)隨泵浦功率變化的趨勢。在實(shí)驗(yàn)溫度T=284K時(shí),泵浦功率為14.1W的情況下,獲得最小脈沖寬度615.56ns,最大重復(fù)頻率24.54kHz。
[Abstract]:The 2 渭 m band is located in the atmospheric window, which is the absorption peak of many atoms and molecules (such as H2O), and the 2 渭 m laser at the human eye safe band can also be used as the pump source of OPO. Therefore, the 2 渭 m band laser has important application value in military defense, industry and agriculture production and so on. In this paper, the output characteristics of new Ho:SSO lasers are studied in order to contribute to the development of related fields. Firstly, the development status and application prospect of 2 渭 m band laser are described. The advantages of 2 渭 m silicate laser are pointed out by introducing and comparing different matrix doped Ho~(3) ion solid state lasers. At the same time, the development of passive Q-switched operation of Ho~(3 doped solid-state laser in recent five years is introduced, and the application value and development potential of Cr~(2 / ZnS crystal as a passive Q-switch in mid-infrared laser are pointed out. Secondly, the physicochemical and spectral properties of Ho:SSO crystal are introduced. According to its absorption and emission spectra, the absorption and emission cross sections are obtained, and the strength parameters of Ho:SSO crystal are calculated. The gain cross sections of Ho:SSO at different inversion population ratios are analyzed theoretically and the possible oscillatory wavelengths are discussed. The quasi-two-level rate equation model of Ho:SSO laser is established, and the rate equation is solved numerically with its crystal parameters, which lays a theoretical foundation for the design of single-end pumped Ho:SSO laser. Thirdly, the influence of cavity length and output mirror curvature on the distribution of oscillatory spot in Ho:SSO laser resonator is discussed, which provides a theoretical basis for the design of single-ended pumped Ho:SSO laser. Based on the theoretical calculation, the effects of the transmittance of the output mirror and the temperature of the gain medium of the resonator (cavity) on the output performance of the Ho:SSO laser are discussed. The maximum output power of 1.71W is obtained when the transmission rate of the output mirror is Tn20, the curvature is Rn-100mm, the length of the resonator is 60 mm, the crystal temperature is 290K, the maximum output power is 2.1W and the CW laser output wavelength is 2113.5nmm. Finally, the passive Q-switched output characteristics of Ho:SSO solid-state lasers are investigated. Firstly, the physicochemical and spectral characteristics of Cr~(2: ZnS crystal are introduced, and the feasibility of using it as a passive Q-switched switch for 2 渭 m band laser is analyzed. Then the rate equation model of Ho~(3) Q-switched laser is established theoretically, and the working process of passive Q-switch is analyzed theoretically. In the experiment, the variation trend of the parameters with pump power during the passive Q-switched pulse operation of Ho:SSO solid-state laser is investigated. The minimum pulse width of 615.56 ns and the maximum repetition rate of 24.54 kHz were obtained at the experimental temperature of T _ (284K) and the pump power of 14.1 W.
【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)】：TN248

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本文編號(hào)：1842348