The homogeneity of the depth of laser-treated zones is one possible factor to define quality and efficacy of altered mechanical properties in materials. For instance, half-rounded cross-sectional shapes of laser-hardened zones using Gaussian beams provide dissimilar hardened depths in the edges and centre of the treated area. This means that the in-depth distribution of compressive residual stresses varies between the edges and the centre of the hardened area. Non-homogeneity of compressive residual stress distributions can inhibit fatigue properties and can lead to product failure. The utilisation of oscillated laser beams has been proven to improve the welding efficiency and an energy input distribution to the material, which promises achieving a homogeneous depth of laser-treated zones. Therefore, this work examines the influence of triangular, square, and circular beam oscillation strategies on the energy input distribution during the process and the geometry of the laser-treated zones on microalloyed steel. Laser beam pathways were assembled using a vector graphic editor to visualise the energy distribution from each oscillation strategy. Cross-section images of the hardened tracks were taken and related to the thermal energy input profiles. It was revealed that each oscillation strategy demonstrates characteristic temporal and spatial thermal energy input, influencing the geometry of the hardened zone. The circular oscillation strategy produced a widely constant depth in contrary to the triangular and square beam oscillation due to its characteristic energy distribution that allows the heat homogenously disseminating in the materials. This confirms that laser beam oscillation strategy can tailor the energy input distribution to optimise the processing outcome.