Abstract
The advances in ultrashort pulse generation and chirped pulse amplification (CPA) techniques have been the driving force in the development of laser systems with peak powers at and beyond the Terawatt (1012 W) level1–7. Most high power systems developed to date, work in the infrafed, and Terawatt and Petawatt (1015 W) class lasers have been demonstrated in Ti:Sapphire, Nd:glass and Cr:LISAF based systems. These systems are moving towards shorter pulse durations, now commonly of the order of tens of femtoseconds, and design goals are heading towards high repetition rate (kHz)8 multiterawatt systems. The progress in this field has certainly been inspired by the improvements in solid-state laser materials for ultrashort pulse generation. An analogous statement does not generally hold, however, for the ultraviolet wavelengths.
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