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Summary form only given. A high-power, mirrorless free-electron laser (FEL) approach based on seeded single-pass amplifier with a prebunched high brightness electron beam as a high-gain medium is presented. This approach depends on a high-current density produced by compressing the electron bunch containing a few nanocoulombs to a few picoseconds. The high-brightness beam can be focused to a small spot, resulting in a very high current density.