A vertical cavity surface emitting laser (VCSEL) is provided with an aperture
for
guiding a flow of electric currents. The aperture is defined by an oxide so that
the aperture is formed to be substantially circular in shape. A method for fabricating
the laser is also disclosed. The structure of the (VCSEL) makes it possible to
control the oxidation rates of an oxidable layer in which an aperture is formed
for guiding the flow of electric currents of a VCSEL, by forming a mesa trench
of the VCSEL in a segmented structure which has a predetermined number of segments.
Accordingly, it is possible to form an aperture approximately in a circular shape,
so that the light emitting angle and shape of the VCSEL are easily controlled.
