Optical fiber device with spatially selectable output

An article of manufacture comprising:

• a tubular body having an axis, an open end, and a closed end, and
• an axial hollow fluidly connecting the open end with the closed end,
• wherein the axial hollow includes
• a first hollow portion defining said open end and having a first internal diameter,
• a second hollow portion at the closed end and having a second internal diameter, and
• an intermediate hollow portion fluidly connecting the first and second hollow portions,
• wherein the intermediate hollow portion extends between a first axial location and a second axial location and having an intermediate internal diameter that monotonically varies from a first intermediate value at the first axial location to a second intermediate value at a third axial location,
• wherein the first axial location is closer to the closed end than the second axial location and the third axial location is between the first and second axial locations,
• and further comprising:
• a lightguide having an output end and an output facet at the output end and disposed within the first hollow portion to have the output facet repositionally movable along the axis between a distal axial position substantially coinciding with the second axial position and a proximal axial position that is closer to the open end than the second axial position.