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相干条件与相干光源高中《物理》下册第253页上写道:“干涉是波特有的现象,只有频率相同、相差恒定的波源——相干波源才能产生稳定的干涉现象。”应当指出:相干条件还应补充一点即“振动方向相同。”因两束光波在相遇点所产生的振动若不在同一方向,则该点的合成振动将不符合简谐振动的规律,因而不能产生干涉现象。
Coherent conditions and coherent light sources High School “Physics”, second volume, p. 253, states: “Interference is a phenomenon that Porter has. Only a wave source with the same frequency and a constant difference—the coherent wave source can produce a stable interference phenomenon.” It should be noted that: The coherence condition should also add that “the vibration direction is the same.” If the vibrations generated by the two light waves at the encounter point are not in the same direction, the resultant vibration of the point will not follow the law of simple harmonic vibration, and interference phenomena cannot be produced.