threshold pumping中文什么意思

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Based on the rate - equation theory of four - level system , the expressions of threshold pump power , output power and slope efficiency are given . the influence of space distribution of pump light ( the position of focusing point , dimension of pumping light and divergence angle ) to the output characteristics are also discussed . then , by investigating the effects of thermal effect of laser crystal on the size of laser cavity mode , we obtain the mode - matching principle of high power laser diode end - pumped solid - state lasers
其中，在泵浦光的空間分布變量中我們分別考慮了泵浦光聚焦后的腰斑大小、聚焦腰斑在增益介質(zhì)中的位置以及泵浦光在介質(zhì)中發(fā)散角的影響；然后我們研究了在高泵浦功率下激光晶體因吸收泵浦光而產(chǎn)生的熱效應(yīng)所導(dǎo)致的熱透鏡效應(yīng)以及熱致衍射損耗，通過(guò)分析它們對(duì)振蕩激光腔模尺寸的影響，得到了高功率半導(dǎo)體激光二極管端面泵浦固體激光器模式匹配的要求，為高功率連續(xù)單頻nd ： yvo _ 4激光器的優(yōu)化設(shè)計(jì)提供了理論依據(jù)。

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