雙(shuang)凸(tu)柱面(mian)(mian)(mian)(mian)鏡有一個(ge)凸(tu)面(mian)(mian)(mian)(mian)柱面(mian)(mian)(mian)(mian)表面(mian)(mian)(mian)(mian)，使(shi)入射光(guang)線(xian)能(neng)夠聚(ju)焦于(yu)某個(ge)維(wei)度，并拉伸圖像，另一面(mian)(mian)(mian)(mian)為(wei)凹面(mian)(mian)(mian)(mian)。 雙(shuang)凸(tu)柱面(mian)(mian)(mian)(mian)鏡的焦距(ju)為(wei)正(zheng)，適合用(yong)于(yu)激(ji)光(guang)線(xian)生成或變(bian)形光(guang)束整形。