| http://www.w3.org/ns/prov#value | - When the laser light outputted from the light source 1 has a longitudinal mode which is a multimode, for example, there is a case where a mode ??1(t) is equal to another mode ??2(t), ??1(t)=??2(t) because of a change in wavelength of the laser light which is caused by the light frequency modulation means 3.
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