The nonlinear ADP crystal is oriented in such a way that phase matched SHG is produced only when both incident beams are present as ordinary rays.

非线性晶体adp的取向是使仅在两束光都存在时才有位相匹配的SHG。

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The calculations show that a ultrashort pulse laser and the medium with higher ionization potential is necessary for generating higher order phase matched harmonic.

分析表明要想使高次谐波获得相位匹配，需要超短脉宽的驱动脉冲以及电离能大的气体工作介质。

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In chapter four, the optimization of quasi-phase matched CSHG is demonstrated. Parametric amplification in the Cerenkov-idler configuration is modeled and analyzed theoretically.

第四章论述了准相位匹配切伦科夫倍频的优化，理论分析和模拟了准相位匹配切伦科夫型参量放大。

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The first half was characterised by phase after phase of Leeds possession, aided by their superb line-out, but their endeavour was matched by Sale's sometimes brutal defence.

BBC: Leeds 3-6 Sale

Button's slightly less strict interpretation of the instruction was what was behind his greater speed at this phase of the race, rather than any intrinsic difference in their potential - which appeared to be extremely closely matched.

BBC: Are Lewis Hamilton & Jenson Button set to collide?