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High energy density science and inertial fusion are of strategic importance for national security. Existing and planned facilities dedicated to such research could be significantly enhanced by the addition of a high-power short-pulse laser. Our research has provided part of the critical enabling R&D that would allow such enhancements. Investigations included the R&D issues related to creating an integrated system for the injection, setup, compression, and monitoring of high-energy, split-beam, short pulse generation from a single aperture of a Nd:glass laser system. In the course of our R&D new amplifier and pulse compressor technologies were developed that meet the stringent operating requirements and architectural constraints of large-scale amplification systems that are capable of producing kJ-class pulses. Introduction/Background The generation of multiple, kilo joule-class, picosecond pulses from a single aperture of a modern Nd:glass laser system has never been accomplished. Production of such short pulses requires new amplifier and pulse compressor technologies that are compatible with the stringent operating requirements and architectural constraints of large-scale amplifications systems and that are capable of producing kJ-class, picosecond pulses in a vacuum environment without component damage. The concepts of split beam amplification and compact mixed grating pulse compressors were studied and submitted as new inventions as part of the recent high energy short pulse strategic initiative. 2 In the first case, it was suggested that two or more, separately timed short pulses could be generated from a single aperture of a large-scale laser amplifier chain by injecting two or more spatially separated, sub-aperture, chirped pulses into the amplifier. By doing so it may be possible to generate multiple time-frame x-ray radiographs of laser driven experiments. In the second instance, it was suggested that a new arrangements of diffraction gratings could reduce by 500% the footprint of chirped pulse, pulse compressors. These compact arrangements are now being considered for deployment at several labs around the world. While the conceptual layout of a split-beam, compact, mixed grating pulse compressor has been considered, the numerous issues related to a real system have never been studied in detail. This ER investigated for the first time the R&D issues related to injection, setup, compression and monitoring of high energy, splitbeam, short pulse generation. In particular it will investigate for the first time the R&D issues associated with an integrated system: a) new techniques for multiple, sub-aperture pulse generation, timing and pulse width control

Amplification and Compressor Technology for "Split Beam", High Energy Short Pulse Generation