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Autori: R. Banici and D. Ursescu
Editorial: EPL, 94(4), p.44002, 2011.
An ultrashort and ultraintense pulses combination method is proposed, based on the spectral combination of parallel laser pulses, with complementary spectra, in chirped pulse amplification (CPA) laser systems. In a proof-of-principle experiment, it is demonstrated that two long pulses of 330 fs can be overlapped in a collinear way, to produce a shorter pulse, of 190 fs. As a consequence, it is shown that the power for the combined pulse obtained is up to a factor of 1.7 larger than the sum of the peak powers of each individual pulse. The spectral phase of the combined pulse was characterized with lambda/10 accuracy, using spectral interferometry. A way to implement the method at parallel CPA laser facilities, using no transmission optics, is indicated.
Cuvinte cheie: ultrashort laser pulses, coherent combining