Abstract
We discuss theoretically how supercontinuum spectra produced from high-order
harmonic generation processes in a synthesized same-color laser field is optimized
by adjusting the chirp parameter of the controlling pulse. Furthermore, a
40-attosecond isolated pulse with an effective bandwidth of 121 orders is obtained
from He+ ion when the chirp rate ratio of pulses has a small value. The numerical
results show that the efficiency of single as pulse generation is enhanced, and the
quantum paths are controlled successfully. Our simulation shows that the produced
pulses with high signal-to-noise ratio are obtained straightforwardly without any
phase compensation. These results are explained using the classical approach.
© 2012 Chinese Optics Letters
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