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激光器的一些原理图!
the collimating and focusing optics consists of two cemented doublets and a precision opotimized aplanatic meniscus lens,as shown in the figure above,this configuration produces a smaller beam spot than when a single doublet is used ,without lowering the performance .the first doublet is used to collimate the laser beam coming from the fiber ,the exit surface of which should be placed in the focal plane of the first doublet .using this system ,the laser beam can be focused to a beam spot of 0.5mm in diameter. |
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