An optical radiation delivery structure including a waveguide conduit having a surgical access portion and a handle portion. The handle portion includes a gripping portion and a waveguide lock, which is configured to have only a locked state and an unlocked state. In some embodiments, the handle portion includes a gripping portion and a counterbalance region, such that a center of mass of the waveguide conduit is disposed towards a proximal end of the waveguide conduit.