Abstract
We propose a scheme that combines the echo-enabled harmonic generation technique with the bunch compression and allows one to generate harmonic numbers of a few hundred in a microbunched beam through up-conversion of the frequency of an ultraviolet seed laser. A few-cycle intense laser is used to generate the required energy chirp in the beam for bunch compression and for selection of an attosecond x-ray pulse. Sending this beam through a short undulator results in an intense isolated attosecond x-ray pulse. Using a representative realistic set of parameters, we show that 1 nm x-ray pulse with peak power of a few hundred MW and duration as short as 20 attoseconds (FWHM) can be generated from a 200 nm ultraviolet seed laser. The proposed scheme may enable the study of electronic dynamics with a resolution beyond the atomic unit of time ($\ensuremath{\sim}24$ attoseconds) and may open a new regime of ultrafast sciences.
Highlights
Fast time-dependent phenomena are typically studied with a pump-probe technique in which the dynamics are initiated by a pump laser and probed by a delayed pulse
The advent of attosecond pulses made possible the time-resolved study of the electronic dynamics which opened up many new ultrafast sciences [1,2,3,4,5]
The pulse duration has been pushed to about 80 as in the extreme ultraviolet wavelength [5]. These studies all relied on the technique of high harmonic generation in gas where an intense laser pulse was focused on an atomic gas jet and the high harmonic of the laser was generated and further used as the probe
Summary
Fast time-dependent phenomena are typically studied with a pump-probe technique in which the dynamics are initiated by a pump laser and probed by a delayed pulse. The advent of attosecond (as) pulses made possible the time-resolved study of the electronic dynamics which opened up many new ultrafast sciences [1,2,3,4,5]. The pulse duration has been pushed to about 80 as in the extreme ultraviolet wavelength [5]. These studies all relied on the technique of high harmonic generation in gas where an intense laser pulse was focused on an atomic gas jet and the high harmonic of the laser was generated and further used as the probe. It appears difficult to generate intense harmonic radiation with wavelength down to 1 nm or shorter with this technique
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physical Review Special Topics - Accelerators and Beams
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
