A vertical cavity surface emitting laser, including an active region, an
electrical contact for injecting current into the active region in order
to generate photons, and an aperture between the active region and the
contact for restricting current flow into the active region. The aperture
is sufficiently large in at least one transverse dimension for the active
region to support multiple transverse modes, and the aperture and contact
are configured to produce current crowding in the active region. The
direction of photon emission from the laser is determined by the
injection current selectively stimulating different transverse modes.