The optical phase modulator 15 inputs coherent light output from the laser light source 10 and transmitted through {TAIL ~ a beam splitter} 14, phase modulates the light according to the position on a beam cross section of {HEAD ~ the light}, and outputs the phase modulated light to the beam splitter 14 
The optical phase modulator 15 inputs coherent light output from the laser light source 10 and transmitted through { TAIL ~ a beam splitter } 14 , phase modulates the light according to the position on a beam cross section of { HEAD ~ the light } , and outputs the phase modulated light to the beam splitter 14
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