Two-dimensional model of heat flow in broad-area laser diode mounted to a non-ideal heat sink

摘要

An analytical, two-dimensional, stationary model of heat distribution in a broad-area laser is discussed. In the model the laser is treated as a stack of layers of different thicknesses and thermal conductivities. We show how to adjust the geometry of such a stack to take into account a non-ideal heat sink (made of material of finite thermal conductivity) and thus obtain reliable values of the device temperature. The calculated and measured thermal resistances of an exemplary laser series are compared. Our experiment is based on the analysis of a spectral shift of the laser radiation, which provides information about the mean temperature of the active region. A discussion of different types of bonding imperfections and their influence on the obtained results is provided.