Considerations on geometry design of surface-emitting laser diodes

The paper presents comments on Baets´ paper (see ibid., vol.135, p.233-41, 1988) which reports an analysis of surface-emitting (SE) diode laser operation. Baets´ thermal model of the SE laser appears to overvalue the active area temperature increase of the laser to a considerable extent. The paper attempts to illumine some errors which may exist in Baets´ model. The thermal model of a Burrus-type light-emitting diode (B-LED), published recently, is adapted for this case, i.e. for the thermal analysis of the SE laser. In the B-LED model, a current-spreading effect, a two-dimensional heat spreading, a radiative transfer of the spontaneous energy as well as a temperature dependence of a thermal conductivity are taken into account whereas a Joule heating is neglected