Extreme ultraviolet (XUV) single-order high harmonic pulses with 10 6 photons/pulse were separated from multiple harmonic orders by a time-compensated toroidal-grating monochromator consisting of a pair of toroidal gratings. The first grating separates the harmonic order and the second one compensates for the pulse-front tilt. The center photon energies were tunable between 42 and 23 eV. The separated single harmonic pulses were spatially and temporally characterized as having a spot size of 58 ± 3 µm at the focus, with a shortest pulse duration of 47 ± 2 fs. The developed XUV light source is versatile for application to time-and space-resolved spectroscopy.

Single 32.6 eV high harmonic pulses from a time-delay compensated monochromator were compressed down to 11 ± 3 fs by completely compensating for 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. The output photon flux on target from the monochromator was comparable to that from a small synchrotron facility, while the pulse duration was more than three orders of magnitude shorter. This high harmonic beam line fulfills two requirements for timeresolved spectroscopy in extreme ultraviolet region, namely, ultrashort pulses and high photon flux. R. Leone, "Ultrafast time-resolved soft x-ray photoelectron spectroscopy of dissociating Br2.," Phys. Rev. Lett. ©2012 Optical Society of America

Single 32.6 eV high harmonic pulses from a time-delay compensated monochromator were compressed down to 11 ± 3 fs by completely compensating for 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. The output photon flux on target from the monochromator was comparable to that from a small synchrotron facility, while the pulse duration was more than three orders of magnitude shorter. This high harmonic beam line fulfills two requirements for timeresolved spectroscopy in extreme ultraviolet region, namely, ultrashort pulses and high photon flux. R. Leone, "Ultrafast time-resolved soft x-ray photoelectron spectroscopy of dissociating Br2.," Phys. Rev. Lett. ©2012 Optical Society of America

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.

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