We report a novel ultrabroadband high-energy femtosecond laser to be built in our laboratory. A 7-femtosecond pulse is firstly\r\nstretched by an eight-pass offner stretcher with a chirp rate 15 ps/nm, and then energy-amplified by a two-stage optical parametric\r\nchirped pulse amplification (OPCPA). The first stage as preamplification with three pieces of BBO crystals provides the majority\r\nof the energy gain. At the second stage, a YCOB crystal with the aperture of 50mm is used instead of the KDP crystal as the\r\ngain medium to ensure the shortest pulse. After the completion, the laser will deliver about 8 J with pulse duration of about\r\n10 femtoseconds, which should be beneficial to the attosecond pulse generation and other ultrafast experiments.
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