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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Received: 2 October 1999 / Revised version: 3 February 2000 / Published online: 24 May 2000
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Brixner, T., Oehrlein, A., Strehle, M. et al. Feedback-controlled femtosecond pulse shaping . Appl Phys B 70 (Suppl 1), S119–S124 (2000). https://doi.org/10.1007/s003400000270
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DOI: https://doi.org/10.1007/s003400000270