Characterization of a seeded optical-field ionized collisional soft x-ray laser
We report spatial and spectral characterization an optical-field-ionized high-order harmonic-seeded soft-x-ray laser showing. We show that it can be controlled between a regular Gaussian shape and a Bessel profile exhibiting several rings via the IR laser pump intensity. The temporal coherence and spectral linewidths of both the seeded and unseeded soft-x-ray lasers were experimentally measured using a varying path difference interferometer. It showed that the high-order harmonic is subject to a strong spectral narrowing during its propagation in the plasma amplifier without rebroadening at saturation.
KeywordsPump Intensity Temporal Coherence Central Spot Bessel Beam High Order Harmonic
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