Spectral energetic properties of the X-ray-boosted photoionization by an intense few-cycle laser

Yu-Cheng, Ge; He, Haiping

doi:10.1088/1674-1056/23/7/074207

Cited by 3 publications

(5 citation statements)

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“…In our recent work, [1] we studied laser-assisted X-ray photoionization and reported that an intense few-cycle laser pulse passing through a gas leaves a clear fingerprint of its field envelope on the photoelectron energy spectrum (PES), which involves continuous X-ray radiation. Figure 1(a) illustrates a typical experimental set-up for this laser pulse measurement.…”

Section: Introductionmentioning

confidence: 99%

“…Here, the PES n(W ) is quantum-mechanically calculated using the strong field approximation. [1,6] Note that this PES has local peaks centered at spectral energy positions W a , W b , W c , etc. Because these energy positions correspond to the extremes of the laser electric field in the time domain, the peak data consist of a pulse fingerprint of the laser pulse envelope.…”

Section: Introductionmentioning

confidence: 99%

“…Laser-assisted X-ray photoionization is significantly enhanced by the above threshold ionization (ATI), [8] which is called the X-ray-boosted photoionization (XBP). [1] The laser pulse in the XBP simply acts as a nonlinear photoelectron energy modulator, and the ATI is only a background of the XBP. The XBP has two advantages for the measurement of the laser intensity and pulse duration.…”

Section: Introductionmentioning

confidence: 99%

“…greater than 10U p for the laser intensities concerned. [1] Even if the momentum shift of the photoelectron in the laser field is considered, the lower limit of the photoelectron energy, which is classically about (ω X − I p ) − 8U p (ω X − I p ) or quantummechanically W a (Fig. 1(c)), is still much higher than 10U p for keV X-rays and intermediate laser intensities (I < 10 15 W/cm 2 and U p < 52.524 eV for 750 nm laser).…”

Section: Introductionmentioning

confidence: 99%

“…For different spatial configurations between laser pulse and X-ray, the XBP PES is classified as single-intensity (SI) or volume-integral (VI) [1] , depending on whether it is calculated (measured) by excluding or including, respectively, the contri-butions from laser intensity less than I. The SI PES data (e.g., the PES shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Statistical properties of the photoelectron energy spectrum generated by an intense laser pulse and a continuous X-ray

Yu-Cheng¹,

Xiang-Jie²,

He³

2014

Chinese Phys. B

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This study shows that the photoelectron energy spectrum generated by an intense laser pulse in the presence of a continuous X-ray has interesting and useful statistical properties. The total photoionization production is linearly proportional to the time duration of the laser pulse and the square of the beam size. The spectral double energy-integration is an intrinsic value of the laser-assisted X-ray photoionization, which linearly depends on the laser intensity and which quantitatively reflects the strengths of the laser-field modulation and the quantum interference between photoelectrons. The spectral energy width also linearly depends on the laser intensity. These linear relationships suggest new methods for the in-situ measurement of laser intensity and pulse duration with high precision.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Statistical properties of the photoelectron energy spectrum generated by an intense laser pulse and a continuous X-ray

Yu-Cheng¹,

Xiang-Jie²,

He³

2014

Chinese Phys. B

Self Cite

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Investigation on the influences of linear chirp with different input pulse intensities on BaF2 cross-polarized wave generation

Li¹,

Liu²,

Liu³

et al. 2015

Acta Phys. Sin.

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Cross-polarized wave (XPW) generation based on BaF2 crystal is one of the most important tools in improving the contrast of ultra-intense femtosecond laser pulses at present. In this paper, the influences of linear chirp with different input pulse intensities on BaF2 XPW generation, including conversion efficiency, spectrum broadening, and pulse duration reduction are in detail simulated and discussed. Especially, the influence of linear chirp on spectrum broadening is comparatively investigated under unsaturated and intense input pulses. While the amount of spectrum broadening relative to linear chirp is symmetrical with respect to the zero chirp point under unsaturated input pulse, the results show that it is no longer those in the case under intense input pulse, and the intrinsic reason is explained in detail in this paper.

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Interference effect in the photodetachment from H- ion in a few-cycle laser pulse

Chen¹,

Zheng²,

Zhang³

et al. 2016

Acta Phys. Sin.

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We theoretically study the electron detachment of negative hydrogen ions in a three-cycle linearly polarized laser field with a wavelength of 2150 nm in the context of the strong field approximation (SFA). The numerical integration and the saddle-point (SP) methods are both used in our calculations. The results show that both the energy spectra and the momentum spectra of the photoelectrons detached from negative hydrogen ions, obtained from these two methods, accord very well with each other for the laser intensities of 1.31011 W/cm2 and 6.51011 W/cm2, respectively. It is found that there is an obvious stripe-like structure along the vertical direction of the momentum spectra when the laser intensity is 6.51011 W/cm2. To explore the main origin which leads to the specific structures of the momentum spectra, we divide the interferences of the electronic wave packets emitted at different times during the laser pulse into the intra-cycle interference and the inter-cycle interference based on the SP method. Inter-cycle interference arises from the coherent superposition of electron wave packets released at complex times during different optical cycles, whereas intra-cycle interference comes from the coherent superposition of electron packets released in the same optical cycle. It is found that when only considering the inter-cycle interference, the main structures of the momentum spectra accord well with the above-threshold detachment (ATD) rings, which indicates that the inter-cycle interference corresponds to ATD rings of the photoelectron spectrum. But when only considering the intra-cycle interference, there are stripe-like structures with left-right asymmetry along the vertical direction of the momentum spectra. So the main structures of the momentum spectra of the photoelectrons are attributed to the interplay of the intra-and inter-cycle interferences. In addition, to intuitively explain the reason why the momentum spectra depend on the intensity of the laser field, we analyze the influence of the intensity of the laser field on the inter-cycle interference of quantum wave packets. It is found that the phase difference of the inter-cycle interference depends on the intensity of the laser field, which may lead to the difference among the momentum spectra of the photoelectrons at different laser intensities. Moreover, the influences of the intra-and inter-cycle interferences on the energy spectrum of the photoelectrons are also analyzed. It is found that the main oscillatory patterns and the peak positions of the energy spectra are mainly determined by the inter-cycle interference. Finally, the effects of the duration of laser pulse on the intra-and inter-cycle interferences are discussed. It seems that the main structures of the momentum spectra accord well with the ATD rings in multi-cycle laser pulses. So it is concluded that in multi-cycle laser pulses, the inter-cycle interference dominates while the intra-cycle interference is suppressed. The work in this paper is meaningful for further understanding the quantum interference effect and the optical control of the laser-induced photodetachment of negative ions.

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Spectral energetic properties of the X-ray-boosted photoionization by an intense few-cycle laser

Cited by 3 publications

References 30 publications

Statistical properties of the photoelectron energy spectrum generated by an intense laser pulse and a continuous X-ray

Statistical properties of the photoelectron energy spectrum generated by an intense laser pulse and a continuous X-ray

Investigation on the influences of linear chirp with different input pulse intensities on BaF2 cross-polarized wave generation

Interference effect in the photodetachment from H- ion in a few-cycle laser pulse

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