Off-resonance regenerative amplification through an oscillating laser? A standingwave laser cavity with mirror reflectivities $R_1=R_2=R$ is oscillating in steady state at its centermost axial mode. A separate signal tuned off by one-half of an axial-mode spacing is sent into one end of this cavity. What is the overall transmission gain for this signal out the opposite end of the cavity? (The laser medium is homogeneous, and its atomic linewidth is wide compared to the axial mode spacing.) What happens to this transmission gain if the mirror reflectivity $R$ is small? Explain physically.