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自从1960年发现激光以来,人们就紧张地从事这种辐射特性的研究。另外,对度量学来说,测定辐射的相干性还有特殊的意义。就一般的意义而言,人们把同时发生的振动或波动过程变化称做相干性。就狭义而言,相干性就是两个光波在叠加时的状态。如果有干涉场,两个波是相干的;如果没有干涉场,两个波则是非相干的。借助干涉条纹衬比度可描出相干度Y_12的特性。Y_12的极值
Since the discovery of lasers in 1960, people have been intensely engaged in the study of this radiation characteristic. In addition, the measurement of radiation coherence has special significance. In a general sense, one refers to coherence as a simultaneous change in the course of a vibration or a wave. In a narrow sense, the coherence is the state of the two light waves when they are superimposed. If there is an interference field, the two waves are coherent; if there is no interference field, the two waves are incoherent. The interference fringe contrast can be used to characterize the coherence Y_12. The extreme value of Y_12