Observation of Reverse Saturable Absorption of an X-ray Laser

被引:23
|
作者
Cho, B. I. [1 ,2 ]
Cho, M. S. [1 ,2 ]
Kim, M. [1 ,2 ]
Chung, H. -K. [3 ]
Barbrel, B. [4 ]
Engelhorn, K. [4 ]
Burian, T. [5 ]
Chalupsky, J. [5 ]
Ciricosta, O. [6 ]
Dakovski, G. L. [7 ]
Hajkova, V. [5 ]
Holmes, M. [7 ]
Juha, L. [5 ]
Krzywinski, J. [7 ]
Lee, R. W. [8 ]
Nam, Chang Hee [1 ,2 ]
Rackstraw, D. S. [6 ]
Toleikis, S. [9 ]
Turner, J. J. [7 ]
Vinko, S. M. [6 ]
Wark, J. S. [6 ]
Zastrau, U. [10 ]
Heimann, P. A. [7 ]
机构
[1] IBS, Ctr Relativist Laser Sci, Gwangju 61005, South Korea
[2] Gwangju Inst Sci & Technol, Dept Phys & Photon Sci, Gwangju 61005, South Korea
[3] IAEA, Nucl Data Sect, Atom & Mol Data Unit, POB 100, A-1400 Vienna, Austria
[4] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA
[5] ASCR, Inst Phys, Slovance 2, Prague 18221 8, Czech Republic
[6] Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England
[7] SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA
[8] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[9] DESY, Notkestr 85, D-22603 Hamburg, Germany
[10] European XFEL, Holzkoppel 4, D-22869 Schenefeld, Germany
基金
英国工程与自然科学研究理事会; 新加坡国家研究基金会;
关键词
FREE-ELECTRON LASER; COHERENT-LIGHT SOURCE; 2-PHOTON ABSORPTION; OPACITY; HOT; ALUMINUM; PLASMA; SINGLE; REGION;
D O I
10.1103/PhysRevLett.119.075002
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A nonlinear absorber in which the excited state absorption is larger than the ground state can undergo a process called reverse saturable absorption. It is a well-known phenomenon in laser physics in the optical regime, but is more difficult to generate in the x-ray regime, where fast nonradiative core electron transitions typically dominate the population kinetics during light matter interactions. Here, we report the first observation of decreasing x-ray transmission in a solid target pumped by intense x-ray free electron laser pulses. The measurement has been made below the K-absorption edge of aluminum, and the x-ray intensity ranges are 10(16) -10(17) W/cm(2). It has been confirmed by collisional radiative population kinetic calculations, underscoring the fast spectral modulation of the x-ray pulses and charge states relevant to the absorption and transmission of x-ray photons. The processes shown through detailed simulations are consistent with reverse saturable absorption, which would be the first observation of this phenomena in the x-ray regime. These light matter interactions provide a unique opportunity to investigate optical transport properties in the extreme state of matters, as well as affording the potential to regulate ultrafast x-ray free-electron laser pulses.
引用
收藏
页数:5
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