Demonstration of a saturated Ni-like Ag x-ray laser pumped by a single profiled laser pulse from a 10-Hz Ti:sapphire laser system

Abstract

A variant of a grazing-incidence pumping ͑GRIP͒ scheme for Ni-like x-ray lasers using a single shaped pulse from a 10-Hz Ti:sapphire laser system has been demonstrated. Experimental and numerical results show that efficient excitation leading to the lasing process can be achieved by controlled shaping of the pump laser pulse. Such a pulse has been defined for a silver slab target. A gain coefficient as high as 76 cm −1 was estimated. Results indicate that the nanosecond amplified spontaneous emission background of the leading edge of the driving pulse is decisive for an efficient pumping process in this version of GRIP.

High-average-power, 100-Hz-repetition-rate, tabletop soft-x-ray lasers at sub-15-nm wavelengths

“…The great interest in sources of bright coherent soft-xray radiation that has motivated the construction of freeelectron lasers [1,2] (FELs) also motivates the development of more readily accessible tabletop soft-x-ray laser (SXRL) sources. Despite the significant progress recently made in both compact high-harmonic-generation-based sources [3,4] and plasma-based SXRLs [5][6][7][8][9][10][11][12][13][14][15], their average power is at present lower than that delivered by soft-x-ray FEL facilities [1,2]. The average power of laser-pumped SXRLs has been limited by the relatively low repetition rate of the high-energy optical wavelength pump lasers used to drive them and by low pumping efficiency.…”

Development of x-ray sources using PW laser systems at APRI GIST

“…In the experiment, the X-ray laser was pumped by a single profiled laser pulse with 1.5-J energy from a 10-Hz Ti:sapphire laser. The experimental details are given in Ref [5]. By controlling the pulse-injection time from the oscillator to amplifier stages, the strength of prepulse and amplified-spontaneous-emission (ASE) background was increased so as to create proper pre-plasma conditions for x-ray lasing as shown in Fig.…”

“…Ever since the establishment of the 100-TW laser in 2006 at APRI in Gwangju Institute of Science and Technology (GIST), we has performed research on x-ray laser development [5] and soft x-ray imaging [6,7]. We successfully demonstrated a saturated generation of Ni-like silver x-ray laser at 13.9 nm by developing a new variation of the grazing incidence pumping (GRIP) scheme pumped with a single-profiled pumping pulse.…”

Autocorrelation-subtracted Fourier transform holography method for large specimen imaging

“…The X-ray laser was generated from a 9-mm-long Ag medium pumped by a Ti:sapphire laser pulse with 2-J energy and 8ps duration. 25 In addition, it was optimized to obtain an output power of 1.5 lJ per pulse, corresponding to 10 11 photons. The generated X-ray laser was focused onto a sample plate by a Mo/Si multilayer mirror of 15-cm focal length and 60% reflectivity.…”