Patent ID: 6973234

Claim:
An optical circuit for condensing laser beams, said optical circuit comprising: a plurality of guided beam incident portions disposed about an axis, each of the guided beam incident portions comprising an incidence port through which laser beams enter and a waveguide for changing propagation angle which is optically connected to the incidence port and changes propagation angles of the incident laser beams, said waveguide having a curved portion, where an angle of the curved portion relative to the axis increases with an increase in distance of the incidence port from the axis; and a guided beam exiting portion comprising a first narrowing tapered portion, which has an inlet end optically connected to the plurality of guided beam incident portions and an outlet end and narrowingly tapers from the inlet end towards the outlet end, and an exit port provided at the outlet end of the first narrowing tapered portion, wherein, the waveguide for changing propagation angle includes a widening tapered portion which has an inlet end and an outlet end and narrowingly tapers from the outlet end towards the inlet end, the waveguide for changing propagation angle includes a second narrowing tapered portion which has an inlet end optically connected to the incidence port and an outlet end optically connected to the inlet end of the widening tapered portion and narrowingly tapers from the inlet end towards the outlet end, and the outlet end of the widening tapered portion is optically connected to the first narrowing tapered portion of the guided beam exiting portion.