A spherical laser includes a transparent or semi-transparent outer
spherical vessel having an internal cavity, an amplifying medium in the
cavity, and means to excite the amplifying medium. The sphere is provided
with a partially reflective coating to act as a spherical optical
resonator. Excitation of the amplifying medium produces an optical gain.
When the gain exceeds cavity losses and threshold conditions are met,
lasing is supported. This creates a three-dimensional, spherically
radiating emission, emulating a point source. The output is radially
diverging, but is harnessed by enclosing the sphere within a mirrored
ellipse to image the output to a point, or within a mirrored parabola to
columinate the emission. A concentric, reflective inner sphere may be
disposed in the cavity, with the amplifying medium lying between the two
spheres. A voltage potential is applied between the spheres to excite the
medium.