The paper reviews the application of internal timevarying perturbation to the problem of laser mode control and stabilization. The spectral characteristics and time domain behavior obtained by means of phase type and loss type perturbations are considered. Two techniques which allow the attainment of high single frequency output powers from normally multimode lasers are described. A method for the absolute frequency stabilization of an FM laser is considered, and a brief discussion of an efficient method of internal modulation, termed coupling modulation, is given.
S. E. HARRIS, "Stabilization and Modulation of Laser Oscillators by Internal Time-Varying Perturbation," Appl. Opt. 5, 1639-1651 (1966)