Abstract
The objective of the Chirped Pulse Amplification (CPA) technique1 is to stretch a pulse in order to amplify it while avoiding non linear effects, and then recompress it to its initial duration. The last requirement has been found particularly difficult to obtain in the less than 100 fs regime. For example, starting with 90 fs pulses and using a classical stretcher based on achromatic lens (stretching coefficient of 5000) we get a recompression in the range of 140 to 200 fs.2 The main reason has been identified as the frequency phase-shift introduced by the aberrations of lenses in the stretcher device. One way to minimize this problem consists of using an all-reflective expander.3 However it has also been shown that the intentional introduction of controlled aberrations using air-spaced doublet lenses in the stretcher can help to compensate highorder phase term.4 In this work we show that a stretcher based on regular aberration- corrected lenses can be optimized allowing to faithfully reproduce at the output initial pulses in the range 80-100 fs.
© 1994 Optical Society of America
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