ADVANCED PROPERTIES OF EXTENDED LASER-PRODUCED PLASMAS FOR EFFICIENT GENERATION OF THE HIGH-ORDER HARMONICS OF ULTRASHORT LASER PULSES

摘要

The review of the studies showing the advanced properties of extended plasma plumes (5 mm) for efficient high-order harmonic generation of laser radiation compared with the short lengths of plasmas (-0.3— 0.5 mm) used in previous studies is presented. The harmonic conversion efficiency quadratically increased with the growth of plasma length at the optimal conditions of plasma formation. The studies of this process using the long plasma jets produced on various metal surfaces, particularly including the resonance-enhanced harmonic generation, two-color pump, and extended nanoparticle plasma, are discussed.