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美国芝加哥大学的R·温斯顿教授等人最近使用一种“非结象聚光镜”的特殊反射镜.这种特殊反射镜是用蓝宝石制作的,用它代替银制反射镜,实现了每平方毫米集光72瓦的强度.
Prof. R. Winston and others from the University of Chicago recently used a special mirror called “non-cluster condenser”. This special mirror was made of sapphire and used it instead of a silver mirror to achieve per square. Millimeter light intensity of 72 watts.