The experimental result shows that the depth of hardened zone and smoothness of surface can be controlled conveniently by varying the power output beam diameter and scanning rate of laser light.

试验表明：通过调节激光器的输出功率、光斑直径和扫描速度可以方便地控制熔化层深度和表面平整度。

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In experiment, output modes of hundred-micron core diameter fiber laser are controled by the hole in the laser cavity, and the effects to beam quality are researched with holes of different diameters.

实验中，采用腔内小孔法对百微米芯径光纤激光器的输出激光模式进行控制，研究了不同孔径对输出激光光束质量的影响。

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Intensity is a measure of power per unit area, and even a laser that emits only a few milli-watts can produce a lot of intensity in a beam that's only a millimeter in diameter.

强度是每单位面积的度量，即使一个仅能产生几毫瓦能量的激光器也能产生一个直径只有一毫米的高强度光束。

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Commercially obtained laser pointers project just a tiny beam, but its diameter grows much bigger as the distance increases and can result in temporarily blindness if shone in someone's eyes.

BBC: Man gets 30 months in prison for shining laser at plane