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We are developing seeded XFEL pulse with HH for coherent XFEL pulse. Using the monitor of temporal overlap with EO sampling technique, seeded pulse was obtained long time against timing drift.
We have investigated the vibrational wave-packet dynamics of hydrogen molecular ions by the pump-probe measurement using sub-10-fs harmonic pulses. The wave-packet evolution is observed in the time-dependent fragment kinetic energy distribution.
Free-electron lasers (FELs), which are based on a self-amplified spontaneous emission (SASE) scheme, have attractive characters as the intense light source in short-wavelength region [1-3]. However, their temporal profile and frequency-domain spectra have shot-to-shot fluctuating spikes originated from the SASE process. One of the promising approaches to these problems is a seeded FEL scheme [4],...
Output energy exceeding 20 μJ has been achieved in the EUV region at 61 nm by the harmonic seeded FEL scheme. Event ratio of the seeded FEL operation has been dramatically improved by a feedback system with an electro-optic sampling technique.
We have resolved the vibrational wave-packet dynamics of D2+ with a period of ∼20-fs generated with sub-10 fs XUV harmonic field. The real-time evolution is probed with the sub-10 fs VUV and DUV harmonic fields.
We measured full-scanning nonlinear Fourier-transform spectroscopy of D2 molecules using high-order harmonic radiation. We compared the spectral shape obtained from the nonlinear Fourier-transform spectroscopy to that measured directly with a spectrometer.
We report on the development of a multi-TW laser system with a pulse duration of 12 fs and an a repetition rate of 100 Hz. This laser system is applied to generate intense high-order harmonic fields with loosely focused geometry.
We first demonstrated a seeded FEL radiation in the EUV region at 61.2 nm with the 13th high-order harmonic beam. We observed single-peak spectra with drastic enhancements of intensity by nearly three-orders of magnitude.
We have concentrated on studying nonlinear interaction of a simple atom or molecule with VUV/XUV high-order harmonic (HOH) fields without help of intense visible laser field[1]. This is owing to the fact that the pulse energy of an attosecond pulse train (APT) synthesized with the HOH fields is sufficiently high due to our original scheme of HOH generation with loosely focused geometry. Nevertheless,...
Frontiers in optical science in the short-wavelength region have greatly been expanded by the advent of intense, single-pass free-electron lasers (FELs) based on a self-amplified spontaneous emission (SASE) scheme [1,2]. However, their temporal profile and frequency-domain spectra are composed of random and uncontrollable spikes, exhibiting shot-to-shot fluctuation originating from the stochastic...
Intense high-order harmonic radiation induces nonlinear optical phenomena, such as two or three photon absorption process in the vacuum and extreme ultraviolet wavelength region. Fragment ion yields via two-photon absorption process of N2 and CO2 molecules were utilized as correlated signals of the attosecond pulse train in the measurement of the interferometric autocorrelation (IAC) [1,2], while...
We have observed periodical frequency modulation of high-order harmonics by changing the delay between the driving two-color laser fields, for the first time. The amplitude of the modulation has been up to ∼0.4 eV.
Life science and biology have advanced with the progress of microscope technology. A strong desire of life scientists is to observe living cells with high spatial resolution. The development of soft x-ray microscopy using a special wavelength called the water window started in the 1970s in order to fulfill this desire. However, the photon fluxes realized so far are still insufficient for this application...
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