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Extension of femtosecond Cr:LiSAF systems to the 100-TW level

The availability of ultrashort (100 fs or shorter) high intensity lasers capable of producing focused intensities in excess of 1018 W/cm2 provides many new opportunities in studying the interaction of radiation with matter. In this paper we describe and compare three methods for generating these high intensity pulses into the 100 TW power range. In addition, we describe in detail the use of Cr:LiSAF as an amplifying medium for this type of laser system. This work also includes descriptions of the factors that affect the performance of short pulse laser systems, especially with regard to Cr:LiSAF. Techniques of how to overcome the obstacles created by these factors are also discussed together with experimental data regarding the bandwidth limits of an existing regenerative amplifier.