concave-convex system

基本解釋

Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.
該方法借助一個(gè)焦距較長(zhǎng)的凸透鏡與被測(cè)凹透鏡組成無(wú)焦系統(tǒng)，可以使準(zhǔn)直琯出射光束的張角發(fā)生改變；
Among the reshaping systems converting a Gaussian beam to a flattop beam, the system composed of a plane-concave and a plane-convex lens, is a relatively simple structure.
在將高斯光束整形爲(wèi)平頂光束的整形系統(tǒng)中，由兩個(gè)非球麪鏡組成的系統(tǒng)是比較簡(jiǎn)單的結(jié)搆形式，該系統(tǒng)由平凹鏡和平凸鏡組成。