The conversion efficiency and the beam quality are two main contents in research of harmonic generation of ultra-short laser.

在超短脉冲激光倍频技术研究中，倍频转换效率和倍频光的光束质量这两个问题一直是研究的核心内容。

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Numerical results show that the effect of metallization thickness is smaller on the direction of main beam and very noticeable on the beamwidth and aperture efficiency.

数值结果表明，金属栅厚度对漏波天线波求方向影响较小，但对漏波天线的辐射效率和波束宽度有明显的影响。

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In this paper, analyzed the beam-Pumping unit's main problems of wasting energy and low efficiency in use and researched on a variety of new oil pumping unit status.

本文分析了游梁式抽油机实际使用存在高能耗、低效率的问题和各种新型节能抽油机的研究现状。

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