Abstract: The invention relates to a semiconductor optical reflector serving in particular for being disposed facing an integrated laser cavity so as to feed light back into said cavity, and enable it to oscillate continuously. The reflector is made up of a plurality of cascaded Bragg reflector sections. More particularly, said sections are of the same length L and have the same coupling coefficient, and the length L of each pair of sections is given by the following relationship:L=.lambda..sup.2 /[(n.sub.i+1 +n.sub.i).times.1.7(n.sub.i+1 .LAMBDA..sub.i+1 -n.sub.i .LAMBDA..sub.i)]where .lambda. is the mean value of the Bragg wavelengths reflected by the reflector;n.sub.i+1 and n.sub.i are the respective effective refractive indices of said adjacent sections; and.LAMBDA..sub.i+1 and .LAMBDA..sub.i are the respective periods of said adjacent sections.The reflector of the invention has a wide spectrum band independent of the value of the coupling coefficient.

Abstract: A semiconductor Bragg reflector and to a method of fabricating it. The reflector comprises a plurality of stacked layers on a substrate of a III-V type material, one of the stacked layers forming a holographic grating. The layer forming the grating comprises an alternating succession of air pockets and of III-V type material. Such a reflector is particularly suitable for use in laser devices.