Optical therapeutic treatment devices, systems, apparatus, methods, and techniques are disclosed. Embodiments can include a housing extending along a central axis X, an elongated fiber guide coupled to the housing and adapted to receive an optical fiber having a proximal end and a distal end, a reflector assembly within the housing and extending along the central axis X. The distal end of the optical fiber can includes a carbonized tip within the reflector assembly. The reflector assembly is adapted to reflect the optical energy emitted from the distal end and propagating radially with respect to the central is, so that the reflected optical energy propagates at least in part along a propagation axis parallel to the central axis. Embodiments can utilize free space optics/transmission. Further embodiments can utilize NIR radiation (e.g., including 870 and 930 nm) that is suitable to cause free radical formation in microbes.