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