Amplification of Broad-Bandwidth Phase-Modulated Laser Pulses and Applications.

摘要: The amplification and propagation of broad-bandwidth, phase-modulated laser pulses was studied experimentally theoretically. near 1053 nm Chirped-Pulse-Amplification (CPA) system at the Laboratory for Laser Energetics (LLE) University Rochester used these experiments. In theoretical analysis power gain amplifier is treated as a function laser's instantaneous frequency. With this approximation non-ideal processes, such narrowing, saturation, self-phase modulation (SPM), can be clearly expressed understood. Experimental results from CPA are in good agreement with theory. sources pedestal (pre-pulse post-pulse) associated were identified, carefully eliminated. This allows to generate ultrahigh-power Gaussian 0.9-ps duration an intensity contrast exceeding 105:l. work makes possible study high density laser-plasma interactions fiber-grating system. Experiments on second harmonic conversion 1.6-ps performed using KDP type I1 crystal. A predelay between extra-ordinary ordinary introduced input doubling crystal order compensate group-velocity mismatch brought energy efficiency up -75 %. Spectral windowing expansion stage generation multiple different frequencies. These synchronized identical spatial profile. They frequency tunable pulsewidth controllable. One application technique measure nonlinear refractive index nearly degenerate four-wave mixing. method automatically provides phase-matching condition mix ultrashort without jittering. presented. theory broad-bandwidth extended linear chirp systems sinusoidal phase (spatial temporal) beam smoothing fusion. An analogy Hamilton-Jacobi equation classic mechanics explain propagation. Amplitude modulations pulse due evolution initial investigated. Local self-focusing light, enhanced by modulation, also studied. CURRICULUM VITAE ACKNOWLEDGEMENTS ABSTRACT TABLE OF CONTENTS LIST TABLES FIGURES vii