Laser surface micromachining with high frequencies is able to initiate heat accumulation effects. Undesired high heat accumulation leads to material overheating with surface oxidation, appearing of liquid phase, and as result low processing quality. The laser pulse duration is one of important parameters, which is able to dramatically change the ablation effectivity. Shorter laser pulse duration leads to deeper transport of the absorbed energy in subsurface material layers. Deeper energy penetration with ultra-short laser pulses is explained by ballistic motion and diffusion of hot electrons. Such ultra-fast and non-equilibrium processes are able to remarkably affect the residual energy which is accumulated in the deeper subsurface layers after ablation. In this paper infrared (IR) radiation measurements with evaluation of the effect of laser pulse duration on heat accumulation is presented. The results are discussed in agreement with the Two-Temperature Model (TTM).