L. S. Kornienko

Utilization of competition between counterpropagating waves for modulation and stabilization of the radiation emitted from a ring laser

Theoretical and experimental investigations were made of the possibility of increasing the efficiency of intracavity modulation and stabilization of the radiation emitted from ring lasers by utilization of the competition between counterpropagating waves. It was established that in the case of solid-state ring lasers one can switch rapidly the direction of counterpropagating waves both in the case of forced mode locking and in the case of single-mode emission without spike transient processes at a relaxation frequency typical of solid-state lasers. An analysis was made of the conditions for significant reduction of the switching time and a method is suggested for achieving this by simultaneous modulation of the amplitude nonreciprocity and of the coupling between counterpropagating waves. It is shown that highly stable unidirectional single-mode operation of a solid-state ring laser can be achieved as a result of weak modulation of the resonator perimeter. Various time dependences of the intensities of counterpropagating waves and stabilization of bidirectional operation of a solid-state ring laser were achieved using a magnetooptic feedback loop.

Sliding pump method for generation and amplification of ultrashort light pulses

Abstract A method for the generation of an ultrashort Raman pulse train with peak power considerably in excess of the pumping one is proposed and theoretically developed. It is shown that it can be used for obtaining tunable picosecond pulses in Raman fiber laser.

INVESTIGATION OF THE DELAY OF STIMULATED EMISSION FROM A CaF2:Dy2+ LASER RELATIVE TO PUMPING PULSES

Experimental and theoretical investigations were made of the delay of stimulated emission from a CaF2:Dy2+ laser pumped with short pulses. The ratio of the delay time to the duration of the laser pulses was determined. A comparison of the experimental data with the calculated stimulated-emission development times indicated that the effective population inversion continued to rise after the end of a pumping pulse. Possible causes of this rise were considered.