The paper presents the experimental demonstration of a nonmagnetic topological insulator laser system, which exhibits topologically protected transport in the cavity. This system demonstrates single-mode lasing, robustness against defects, and significantly higher slope efficiencies compared to topologically trivial counterparts. The authors fabricate a 10x10 coupled ring-resonator array on an active platform involving vertically stacked InGaAsP quantum wells. They couple the array to a waveguide acting as an output coupler and pump the perimeter of the array to observe lasing. The results show that the topological system lases with higher efficiency and remains single-mode over a wide range of pumping densities, while the trivial arrays emit in multiple modes with broader linewidths. The topological lasing is further demonstrated to be robust against defects, as the lasing edge mode can bypass defects and maintain uniform intensity. Additionally, the authors introduce a topological system based on S-chiral resonators, which can enforce predetermined unidirectional lasing without magnetic fields, showcasing the potential of active topological platforms.The paper presents the experimental demonstration of a nonmagnetic topological insulator laser system, which exhibits topologically protected transport in the cavity. This system demonstrates single-mode lasing, robustness against defects, and significantly higher slope efficiencies compared to topologically trivial counterparts. The authors fabricate a 10x10 coupled ring-resonator array on an active platform involving vertically stacked InGaAsP quantum wells. They couple the array to a waveguide acting as an output coupler and pump the perimeter of the array to observe lasing. The results show that the topological system lases with higher efficiency and remains single-mode over a wide range of pumping densities, while the trivial arrays emit in multiple modes with broader linewidths. The topological lasing is further demonstrated to be robust against defects, as the lasing edge mode can bypass defects and maintain uniform intensity. Additionally, the authors introduce a topological system based on S-chiral resonators, which can enforce predetermined unidirectional lasing without magnetic fields, showcasing the potential of active topological platforms.