The diameter of the spot of the light output from a laser diode is reduced through a coupled optical system so as to be smaller than the incidence aperture of a tapered total reflection rod. The light output from the coupling optics is focused into the incidence aperture of the total reflection rod....http://www.google.com/patents/US5859868?utm_source=gb-gplus-sharePatent US5859868 - Solid-state laser device which is pumped by light output from laser diode
