We present the two results of high-order harmonic generation experiment by using an ultrafast near infrared (NIR) pulse, one is the generation of a coherent water window x-ray under a neutral-medium condition, and the other is the generation of a continuum high-order harmonic spectrum by mixing multicycle two-color NIR laser fi elds.Our proposed generation scheme, combining an NIR (1600 nm) laser driver and a neutral medium, is effi cient and scalable in output yields of the water window x-ray.And also, by optimizing the wavelength of a supplementary NIR pulse in a two-color fi eld, a continuum harmonic spectrum was created around the cutoff region without carrier-envelope phase stabilization.The obtained harmonic spectra clearly show the possibility of generating isolated attosecond pulses from multicycle two-color laser fi elds.This concept opens the door to create an intense, isolated attosecond pulse using a conventional femtosecond laser system.
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Takahashi et al. (2010) studied this question.
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