Thermal conductivity of semiconductor disk lasers for more accurate heat management

摘要

Accurate heat management is crucial for a high-power, good beam quality semiconductor disk laser because the emitting wavelength, the resonant periodic gain structure, and the microcavity modes of the laser are all temperature sensitive, and ideal performance could be achieved only if the above three elements are carefully controlled and coincided at the working temperature. The gain chip of a semiconductor disk laser is consisted of two nanostructures: the multiple quantum wells and the distributed Bragg reflector. In this work, three theoretical methods, in which various nanoscale effects are considered, are employed to calculate the thermal conductivity of similar multilayer nanostructures. By referencing to reported experiments, the one more agree with measured data is picked out to compute thermal conductivities of multiple quantum wells and distributed Bragg reflector, and the results are compared with bulk values.