quasi-phase-matching 中文意思是什麼
quasi-phase-matching
解釋
準相位匹配-
At present, people usually use birefrigence and quasi - phase - matching methods to achieve higher effiency in the process of conversion. a significant advantage of quasi - phase - matching method is that the interaction is occurred through the largest element of the x ( 2 ) tensor ; the period of optical superlattice can be designed randomly, and any interaction can be matched without walk - off angle ; they are fitted to be used in frequency conversion of lower power especially. the quasi - phase - matching method has some advantages over birefrigence method, improving the efficiency of frequency conversion ; the range of frequency conversion covers its whole transperant wavelength
由於準相位匹配技術有其獨特的優勢，可以利用非線性光學晶體的最大二階極化張量，如ppln 、 pplt 、 ppktp用的非線性極化張量都是d _ （ 33 ） ，其有效非線性系數高出普通非線性光學介質（如bbo 、 lbo 、 ktp ）一個數量級，而且可以人為靈活設計調制周期，通過周期設計其頻率變換范圍可以覆蓋準相位匹配介質的整個透明波段，選擇無走離效應，解決了常規pm難以解決的問題，拓寬了非線性晶體的應用范圍，極大地提高了頻率轉換效率，已成為非線性光學材料和固體激光器的研究熱點之一。 -
This thesis focuses the research on the theory and application of the electro - optic effect in the quasi - phase - matching ( qpm ) nonlinear optics based on periodically poled lithium niobate ( ppln )
本文旨在對電光效應基於周期性極化鈮酸鋰（ ppln ）的準位相匹配（ qpm ）非線性光學中的理論及其應用進行研究。 -
In this thesis, the main contents are following : 1. reviewing the theory of nonlinear frequency conversion. quasi - phase - matching is discused. presenting the method for configuring periodically poled as well as multiple period superlattice
闡述了非線性頻率變換的原理，討論了相位匹配和準相位匹配技術，著重說明了周期和準周期光學超晶格的工作原理。 -
Ld - pumped nd : yag, lbo ( type - i critical phase matching ) intracavity frequency doubled, blue laser at 473nm was obtained finally. under the condition of 14w pump power, high power tem00 mode blue laser at 473nm of 1. 1w was obtained. by means of inserting diaphragm into cavity, the power fluctuation and beam mode were improved ; in the experiments, the proportion of special mode matching in quasi - three - level laser was discovered, and the phenomenon were explained reasonedly
實驗上採用對熱效應不敏感的三鏡折疊腔， ld泵浦nd : yag ，類相位匹配lbo作為倍頻晶體，獲得了1 . 1瓦的連續473mn藍光輸出；採用腔內插入光闌的方法，有效克服了功率抖動，同時改善了光斑模式；實驗中發現準三能級激光器存在兩個空間模式匹配比例關系，並對這一現象給出了合理的解釋。
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