LASER BEAM STABILIZING PROCESS Russian patent published in 2001 - IPC

FIELD: laser engineering; optical communications, data processing, and research experiments. SUBSTANCE: stabilizing effect is attained by using combination of two delayed positive and negative feedback circuits; delay in negative feedback circuit is chosen to be shorter than time of scanning laser resonator by light beam and in positive feedback circuit it is not to be shorter than scanning time. With impact of negative feedback being greater than that of positive feedback such combination will ensure very large stability area for full gain (maximum permissible gain is 10 times higher than threshold value). Optimal proportion between impact of positive and negative feedback ranges between 10 and 50%. Laser modes are synchronized and long trains of ultrashort pulses are generated at appropriate time characteristics of feedback. EFFECT: enlarged range of active medium gain and resonator quality factor both in continuous- wave mode and when generating long trains of ultrashort pulses. 4 cl, 4 dwg