Generation of an isolated sub-100 attosecond pulse in the water-window spectral region

doi:10.1088/1674-1056/19/1/019501

Abstract We propose a scheme to generate isolated attosecond pulses in the water-window spectral region. Based on the numerical solutions of the single active electron model, we investigate high-order harmonic generation in helium atoms driven by a multi-cycle two-colour optical field synthesized by an intense 2000 nm, 20 fs pulse and its frequency-doubled pulse. When the latter is slightly detuned and properly phase shifted with respect to the fundamental laser pulse, an ultra-broad extreme ultraviolet supercontinuum with a spectral width of 130 eV can be generated in the 270--400 eV spectral regions. A supercontinuum from 280--340 eV in the water window can be selected to yield an isolated 67 attosecond pulse without employing any phase compensation. This water window coherent x-ray pulse with less than 100 attosecond duration is a potential tool for studying the ultrafast electronic dynamics of biological samples in water.

Keywords: x-ray ultraviolet spectra optical harmonic generation

Received: 02 April 2009
Revised: 26 May 2009
Accepted manuscript online:

PACS:	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)
	33.20.Lg	(Ultraviolet spectra)
	33.80.-b	(Photon interactions with molecules)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2006CB806000), the Knowledge Innovation Program of Chinese Academy of Sciences, and the National Natural Science Foundation of China (Grant Nos. 10734080, 60578049 and 10523003).

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Zou Pu(邹璞), Li Ru-Xin(李儒新), Zeng Zhi-Nan(曾志男), Xiong Hui(熊辉), Liu Peng(刘鹏), Leng Yu-Xin(冷雨欣), Fan Pin-Zhong(范品忠), and Xu Zhi-Zhan(徐至展) Generation of an isolated sub-100 attosecond pulse in the water-window spectral region 2010 Chin. Phys. B 19 019501

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Generation of an isolated sub-100 attosecond pulse in the water-window spectral region

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