Pulse Compression of Phase-matched High Harmonic Pulses from a Time-Delay Compensated Monochromator

Abstract

Abstract. Pulse compression of single 32.6-eV high harmonic pulses from a time-delay compensated monochromator was demonstrated down to 11±3 fs by compensating the pulse front tilt. The photon flux was intensified up to 5.7×10 9 photons/s on target by implementing high harmonic generation under a phase matching condition in a hollow fiber used for increasing the interaction length.

Grating Configurations for the Spectral Selection of Coherent Ultrashort Pulses in the Extreme-Ultraviolet

“…To overcome this limit, double-grating designs have been proposed and realized by using two gratings in a time-delay compensated configuration, where the second grating compensates for the time and spectral spread introduced by the first one [27][28][29][30][31]. Pulses as short as 8 fs have been measured at the output of a double-grating monochromator at 35 nm, i.e., H23 of Ti:Sa laser (see Reference [28]).…”

Design Study of Time-Preserving Grating Monochromators for Ultrashort Pulses in the Extreme-Ultraviolet and Soft X-Rays

“…The first grating is demanded to perform the spectral selection on an intermediate slit, and the second grating compensates for the pulse-front tilt of the monochromatic diffracted beam, giving an output pulse with ideally no tilt. Double-grating monochromators have demonstrated a temporal resolution higher than 10 fs [25][26][27][28]. The choice between the two configurations has to be performed as a trade-off between efficiency and simplicity, that are maximized in the single-grating design, and temporal resolution, that is maximized in the double-grating design.…”

Electron trajectory selection for high harmonic generation inside a short hollow fiber

“…In a previous study [10], we enhanced the conversion efficiency by a factor of 7 at the 19th harmonic (H19) by using a hollow fiber to make the interaction length longer and evaluated the saturation condition of the harmonic intensity in relation to gas pressure. After the selection of a single harmonic using a time-delay compensated monochromator (TDCM) with the temporal duration preserved [10][11][12][13][14], the output photon fluxes at 23.4, 26.5 29.6, 32.8, and 35.9 eV were 1.8 × 10 9 , 4.0 × 10 9 , 7.1 × 10 9 , 5.7 × 10 9 , and 6.4 × 10 9 photons/s, respectively [10].…”

“…After the selection of a single harmonic using a time-delay compensated monochromator (TDCM) with the temporal duration preserved [10][11][12][13][14], the output photon fluxes at 23.4, 26.5 29.6, 32.8, and 35.9 eV were 1.8 × 10 9 , 4.0 × 10 9 , 7.1 × 10 9 , 5.7 × 10 9 , and 6.4 × 10 9 photons/s, respectively [10]. These were comparable to the photon fluxes at synchrotron radiation facilities.…”