Laser induced x-ray fluorescence were observed against laser polarization ellipticity. While emission from krypton peaks at linear polarization, a signature of recollision, emission from neon shows opposite trend. We attribute it to two competing processes.
We have generated soft X-ray pulses at the wavelength around 30 nm and 10 nm using high-order harmonic generation (HHG) in Ar and Ne gas targets respectively with low repetition rates, hundred-terawatt-level laser system in Shanghai Institute of Optics and Fine Mechanics (SIOM). The shortest wavelength of our generated harmonics is 9.8 nm at the 81th harmonic with the Ne gas target. Around the wavelength of 13 nm, the output energy of the 59th harmonic (13.5 nm) and the 61th harmonic (13.1 nm) reaches 10 nJ per pulse. This highly coherent extreme ultraviolet (XUV) source can be served as a potential seed for the free-electron laser (XFEL) with the method of laser wakefield acceleration (LWFA). Moreover, the 13 nm HHG source can be applied to coherent diffraction imaging (CDI) and XUV lithography.
The phase compensation of the negatively chirp of the attosecond pulse train is demonstrated experimentally. By adding
a weak second harmonic laser field, the phase compensation can be negatively chirp or positively chirp at different time
delay, which support a new way to generate the strong transform-limited attosecond pulse.
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