Solid-state batteries promise higher safety and energy density than conventional lithium-ion batteries, making them a key technology for next-generation energy storage systems. The garnet-type solid electrolyte lithium lanthanum zirconium oxide (LLZO) is among the most promising electrolytes for solid-state batteries. However, achieving a long-term operational stability remains challenging, as it requires maintaining a stable interfacial contact between LLZO and the active materials. Targeted interfacial engineering is therefore essential to ensure a stable areal contact. Pulsed laser ablation represents a promising approach for precise and flexible surface modification. However, ultrashort pulse laser processing can induce localized melting, increasing the risk of lithium loss and decomposition of the cubic LLZO phase, which is essential for a high ionic conductivity. In this study, this phenomenon is systematically addressed by investigating the influence of various laser processing parameters on the melt formation to deliberately provoke melt residues and controlled morphological modifications of the LLZO surface. Raman spectroscopy revealed that even pronounced laser-induced melting did not result in detectable phase changes within the bulk material. In symmetric lithium metal cells, an improved interfacial contact was observed for all laser-treated samples, while a pronounced increase in the critical current density occurred only for moderate melt residues compared to untreated reference samples. In contrast, excessive melting resulted in a reduced critical current density and diminished mechanical stability of the solid electrolyte. These findings highlight the existence of a processing regime in which controlled melt formation enhances the interfacial stability without compromising the structural integrity of the LLZO.