LIGHT SOURCE DEVICE, OBSERVATION DEVICE, AND PROCESSING DEVICE.

摘要

A light source device (1) includes a laser light source (10) and an optical phase modulation element (15). The optical phase modulation element (15) inputs a coherent light which has been outputted from the laser light source (10) and has passed through a beam splitter (14) and phase-modulates the light in accordance with the position of the light on the light beam cross section so as to output the phase-modulated light to the beam splitter (14). When (p+1) areas are defined by p circles around a predetermined position on the beam cross section of the light inputted to the optical phase modulation element (14), the radial-direction width of each of the (p+1) areas becomes wider in the outer areas, the phase modulation amount in each of the (p+1) areas is constant, and phase modulation amounts are different between two adjacent areas among the (p+1) areas by p.