Thermal Imaging of Actively Cooled High-Power Laser Bars

Abstract

The results of thermal characterization of actively cooled high-power laser bars are presented. The experimental data obtained by thermal imaging is compared with modelling of temperature distributions in the packaged device. The temperature differences between the central part and the edges of the array are determined. Moreover, we present the microscopic scale temperature profiles in-junction plane and perpendicularly to junction. The thermal behaviour of the bar during long-pulse operation is analyzed both experimentally and theoretically. Possible impact of the thermal properties on the emission characteristics of the bar is discussed.