To explore the potential of using ACD from 2D chiral organic thin films for generating CP light, we developed a free-space dye laser system with a chiral cavity incorporating such thin film. Our experimental results demonstrate the successful generation of CP laser light, achieving a DOCP as high as 0.6, along with a DOP approaching 0.8, indicating superior control over the polarization state. The ellipticity of the emitted light is attributed to the ACD effect of the 2D chiral thin film, which induces asymmetric cavity losses between LCP and RCP light. We observed dynamic changes in the CP characteristics as a function of pump energy, with DOCP increasing initially and then decreasing as pump power rises.