Method for producing an optical emission module having at least two vertically emitting lasers

A method for producing an optical emission module having at least two vertically emitting lasers, the method comprising:

• forming an optically active laser layer on a substrate and at least one upper covering layer on said optically active laser layer,
• in a first etching step, etching an upper mesa region for each of the vertically emitting lasers to be produced, wherein the etching depth of the first etching step is selected such that the first etching step is terminated before the optically active laser layer is exposed, and wherein the first etching step is carried out in such a way that a resulting distance between the upper mesa regions of the respective vertically emitting lasers is so small that the radiation generated by the finished produced lasers can be coupled directly into a single optical waveguide, and
• in a second etching step, severing the optically active laser layer to form lower mesa regions, the second etching step being performed using one of a wet-chemical and a dry-chemical etching process using a predominantly chemical etching component.