Wafer-level stage testing of semiconductor lasers can be facilitated by
directing a light beam emitted from the semiconductor laser toward a
direction different from a path of the light beam as originally emitted
from the laser. A test structure can be coupled to a back facet of the
laser and can include a first region separated from a second region by an
inclined interface. When a light beam is emitted from the laser, the
light beam can be received on the inclined interface and then directed
toward a light detector for detection and evaluation.