Strong Laser Light Dvd
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In the design of laser beam expander, the placement of objective lens and image lens is opposite. In the design of Kepler beam expander, the collimating input beam focuses on a point between the objective lens and the image lens, which generates the point of laser energy concentration in the system. Focus heating the air between the lenses causes the light to deviate from its path, which may lead to wavefront errors. For this reason, most beam expanders are designed using Galileo beam expanders or their variants.