METHOD AND SYSTEM FOR CHARACTERIZATION AND COMPRESSION OF ULTRASHORT PULSES

摘要

The present application relates to a method and system for characterization and compression of ultrashort pulses. It is described a flexible self-calibrating dispersion-scan technique and respective system to characterize and compress ultrashort laser pulses over a broad range of pulse parameters, where previous knowledge of the amount of dispersion introduced for each position or step of the compressor is not required. The self-calibrating d-scan operation is based on the numerical retrieval of the spectral phase of the pulses using an optimization algorithm, where the spectral phase is treated as a multi-parameter unknown variable, and where the unknown dispersion of the dispersion scanning system is described by a theoretical model of its functional dependence on the compressor position. The apparatus for pulse characterization may comprise in this sequence a telescope (52), a wedge (53) for providing a controllable amount of dispersion, a non-linear medium for frequency doubling (55), a polarizer (56), a lens (57) and an imaging spectrometer (58).