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We present in this work the first attosecond pulse train reconstruction of high-order harmonics generated from plasma. We demonstrate that, as with gas medium, plasma medium can also be used to generate attosecond pulses in the extreme ultraviolet range. We generate harmonics from chromium plasma, with five harmonics between the 11th to the 19th order. By using the method of reconstruction of attosecond...
20 muW of average power at ~18 mum is generated by difference frequency mixing the 300 mW, two-color output of a Yb:fiber amplifier. The mid-infrared power was not limited by two-photon absorption allowing it to be scaled.
Ultra broadband nonlinear two-photon gain is proposed for pulse compression down to few optical cycles. Recent experimental report on two photon gain in semiconductor is exploited for analysis of pulse compression under realistic semiconductor parameters.
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