“Gaussian laser beam”造句，怎麼用Gaussian laser beam造句

When the spot size of Gaussian laser beam is smaller than altrasonic wavelength and their ratio is suitably selected, the intensity of focused laser beam can be nearly flat in the central region.

A novel method for propagating light-knife by the reflection of Gaussian laser beam at a cylinder is put forward and the formula to appraise the geometry parameters of light knife is also derived.