Abstract

We have constructed a compact efficient Ti:sapphire laser system that generates 30  fs, 630   mJ pulses at a repetition rate of 10   Hz. A new geometry for a single-stage multipass power amplifier is proposed that greatly weakens and even makes use of thermal lensing. Such geometry can realize high output in a single-stage power amplifier; otherwise at least two-stage power amplifiers are required. The new configuration simplifies the laser system and reduces the cost. The key point in this design is that the beam spot size evolution is considered in combination with the pulse amplification.

© 2007 Optical Society of America

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