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In this presentation we report on the first generation of high-contrast, 164-fs duration pulses from the laser system POLARIS reaching focused peak intensities in excess of 2×1020W=cm2. To our knowledge, this is the highest peak intensity reported so far which has been achieved with a fully diode-pumped solid-state laser (DPSSL). Several passive contrast enhancement techniques have been specially developed and implemented achieving a relative pre-pulse intensity better than 10−8 at t=-30 ps before the main pulse. Furthermore a closed-loop adaptive-optics system has been installed. Together with angular chirp compensation this method has led to a significant reduction of the focal spot size and an increase of the peak intensity.
© 2013 Optical Society of America
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