#$%^&*AU2019226155A120190926.pdf#####ABSTRACT A frontal light diffusing device for delivering a predetermined optical irradiance value to a targeted treatment area comprising a non-circular core fiber section having a proximal end, a distal end, an optical axis, and a non-circular fiber core； and a lens component having a lens； wherein: the lens component is physically attached to the distal end of the non-circular fiber section； the noncircular fiber core has a latitudinal, cross sectional shape of a regular polygon； and when the front light diffusing device is in light communication to a light source； (i) the light source provides and transmits light rays to the frontal light diffusing device； (ii) the light rays, having respective angles relating to the optical axis of the non-circular fiber section, enter the proximate end of the non-circular core fiber section and propagate internally within the non-circular fiber core while preserving the respective angles thereby achieving a "top hat" core irradiance distribution； (iii) the light rays exit the distal end of the non-circular core fiber section in a mixed "top hat" spatial irradiance distribution； (iv) the lens receives the light rays exiting the distal end of the non-circular core fiber section and projects the light rays onto the targeted treatment area located at a predetermined standoff distance from the lens resulting in the targeted treatment area receiving a targeted "top hat" spatial irradiance distribution with less than +/20% of the predetermined optical irradiance value； and (v) the physical attachment of the lens component to the distal end of the non-circular core fiber section is designed to reduce transmission loss during transmission of the light rays from the distal end of the non-circular core fiber to the lens. 11649326 1 (GHMatters) P110915.AU.11/38 CN4 0 0 0') =>； atL at at0
