Feedback-controlled femtosecond pulse shaping |
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Authors: | T. Brixner A. Oehrlein M. Strehle G. Gerber |
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Affiliation: | (1) Institut f?r Physik, Universit?t Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany;(2) Femtolasers Produktions GmbH, Fernkorngasse 10, 1100 Vienna, Austria;(3) Institut f?r Physik, Universit?t Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany |
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Abstract: | We describe the experimental implementation of feedback-optimized femtosecond laser pulse shaping. A frequency-domain phase shaper is combined with different pulse characterization methods and appropriate optimization algorithms to compensate for any phase deviation. In particular, bandwidth-limited, amplified laser pulses are achieved by maximizing the second-harmonic generation (SHG) of the shaped laser pulses with the aid of an evolutionary algorithm. Real-time measurement of the absolute phases is achieved with spectral interferometry where the reference pulse is characterized by FROG, the so-called TADPOLE method. Using the complete electric field as feedback, arbitrary laser pulse shapes can be optimally generated in two different ways. First, a local convergence algorithm can be used to apply reliable and accurate spectral chirps. Second, an evolutionary algorithm can be employed to reach specific temporal profiles. |
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