ИСТИНА

In many practical cases laser systems based on pulsed (qcw) oscillators quite competitive with cw based ones, providing high pulse energy at the oscillator output, better efficiency of energy consumption, lower thermal loading, relative simplicity and compactness. High-peak-power modelocked picosecond lasers with pulsed pump are applicable for such fields as pump-probe experiments, laser ranging, optical parametric chirped-pulse amplification, high precision laser micromachining, soft X-ray generation, laser photo injection for electron accelerators, etc. Integration of such lasers into any system assumes possibility of output ultrashort pulse synchronization with some external signal [1]. Widely used technique of jitter reduction due to active resonator length controlling in cw oscillator is not valid at pulsed pump approach because of very short time of generation process. The only possibility of laser pulse synchronization is locking on its time position to phase of active mode locking signal. The accuracy of synchronization may be attributed to “width of temporal window” which is formed at each pump pulse during generation process by action of several factors such as action of negative feed-back and active mode-locking by means of electrooptical amplitude modulator, passive mode-locking based on semiconductor absorber mirror, amplification in active element. In this paper we present experimental and modeling results on jitter minimization in Nd:YAG and Nd:YLF lasers longitudinally pumped by qcw diode-array. On the laser outputs, up to 2 mJ energy pulses with durations of 25 and 16 ps at 1.064 and 1.053 μm correspondingly were generated with the timing jitter not more than 50 ps. Limiting factors of further jitter decrease are discussed