Extreme value property of regular double-random parametric process 正則重隨機(jī)參變過程的極值性質(zhì)
Based on these foundations, we give a perfect scheme of the bbo opos : single pass amplification coefficient of the opg under different pump intensity is calculated; collinear type-i and type-ii phase matching tuning curve pumped by the q switch nd : yag various harmonics as well as noncollinear type-i tuning curve are calculated in details; the effect of the walkoff for the nonlinear effect coefficient and the group velocity matching are analyzed; the acceptance angle in parametric process is calculated; the numerical threshold of the bbo opo is calculated; the process of the saturation and depletion of the pump beam are analyzed; the relationship of the conversion efficiency and reflectance of output mirror are discussed; various linewidth controlling methods are discussed; the improvement of the beam quality applying the unstable cavity is discussed; and the crystal bbo design is considered 在此基礎(chǔ)上,給出了一整套bbo-opo激光參數(shù)設(shè)計(jì)方案:計(jì)算了不同泵浦強(qiáng)度下的參量放大倍數(shù);詳細(xì)計(jì)算了在nd:yag調(diào)q激光器各次諧波泵浦條件下的共線類和類相位匹配的調(diào)諧曲線,以及非共線類相位匹配調(diào)諧曲線;分析了走離角對(duì)非線性系數(shù)和群速匹配的影響;計(jì)算了參量過程的允許角;計(jì)算了bbo-opo的理論閾值條件;分析了飽和與泵浦光束的消耗過程;給出了轉(zhuǎn)換效率與超過泵浦閾值的倍數(shù)的關(guān)系;討論了轉(zhuǎn)換效率與輸出鏡反射率的關(guān)系;討論了線寬控制的各種方法;研究了利用非穩(wěn)腔改善光束質(zhì)量的方法;考慮了bbo晶體的設(shè)計(jì)。
Our mainly work in theoretical study are described as followings . as pulsed opos work in a transient regime, a dynamic model is applied to analyzes its operation characteristics, and a result of the numeral simulations for the transient regime parametric process is presented and it is fitted the experimental result very well . thus it provides theoretical foundation for the opos practical parametric designs 本文在理論方面的主要工作是:由于脈沖opo工作于瞬態(tài),因此用動(dòng)態(tài)模型對(duì)其運(yùn)轉(zhuǎn)特性進(jìn)行了分析,給出了瞬態(tài)參量過程的數(shù)值模擬結(jié)果并且與已有的實(shí)驗(yàn)結(jié)果吻合的很好,這為opo的實(shí)用化的參數(shù)設(shè)計(jì)提供了理論依據(jù)。