Apparatus for irradiating an area with a controllable pattern of light

摘要

Apparatus for irradiating an area with a controllable pattern of light comprises a laser (2), which illuminates a spatial light modulator (6). The resulting spatially modulated light then passes to a cholesteric liquid crystal polymer beam-splitter (10) which reflects it to an image surface (13) of an endoscope (12). The endoscope relays it to another image surface (40) whence it is focussed on the area to be irradiated. This light may be used for photodynamic therapy.