PURPOSE: To enhance an output of a semiconductor laser-excited solid state laser by collimating a plurality of semiconductor laser lights conducted by an optical fiber bundle by a lens bundle, and further simultaneously condensing them by a condensing lens to end face-excite it.

CONSTITUTION: A semiconductor laser end face-excited solid state laser comprising an optical coupler having optical fiber groups for guiding lights of a plurality of semiconductor lasers 1, a lens bundle 4 for collimating output lights of optical fibers 3, and a second lens 5 used as a focusing lens for end face- exciting a solid state laser element 6 by simultaneously condensing the output lights of the fibers to be superposed at one place. The plurality of semiconductor laser lights can be condensed at one plate to be excited. The lights of the respective two lasers are beam-mixed by a polarizing beam splitter to multiply its output.