Enhancement of high harmonics from plasmas using two-color pump and chirp variation of 1 kHz Ti:sapphire laser pulses
R. A. GaneevBlackett Laboratory, Imperial College London, London SW7 2BW, UK. [email protected]C. HutchisonBlackett Laboratory, Imperial College London, London, SW7 2BW, UKA. ZaïrBlackett Laboratory, Imperial College London, London, SW7 2BW, UKTobias WittingBlackett Laboratory, Imperial College London, London, SW7 2BW, UKF. FrankBlackett Laboratory, Imperial College London, London, SW7 2BW, UKW. A. OkellBlackett Laboratory, Imperial College London, London, SW7 2BW, UKJ. W. G. TischBlackett Laboratory, Imperial College London, London, SW7 2BW, UKJ. P. MarangosBlackett Laboratory, Imperial College London, London, SW7 2BW, UK
2011en
ABI
Аннотация
We have investigated resonance effects in high-order harmonic generation (HHG) within laser-produced plasmas. We demonstrate a significantly improved harmonic yield by using two-color pump-induced enhancement and a 1 kHz pulse repetition rate. Together with an increased HHG output, the even harmonics in the cutoff region were enhanced with respect to odd harmonics. We report the observation of a resonance-induced growth in intensity of 20th harmonic in silver plasma (2×), 26th harmonic in vanadium plasma (4×), and 28th harmonic in chromium plasma (5×).
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