High energy femtosecond mid-infrared generation pumped by a two-color Ti:sapphire multipass amplifier

Xia, Jiangfan; Song, Jie; Strickland, D.

doi:10.1007/s11434-008-0158-z

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…It is well known that the intensity and the CEP stability of a few-cycle laser determine the cutoff energy of the generated photons and the time resolutions REVIEW OPTICS of the pulse measurements, respectively. Recently, in the race of making state-of-the-art ultra-short laser systems, many Chinese researchers have made their contributions [14][15][16][17][18][19][20] . With the development of ultra-fast measurement, extremely shorter and much higher photon energy X-ray pulses are to be produced and used.…”

Section: Development Of Ultra-fast Measurement Techniquesmentioning

confidence: 99%

Radiation properties of high-order harmonic generation for the measurements of femto- and attosecond X-ray pulses

Yu-Cheng

2009

Chin. Sci. Bull.

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REVIEW OPTICSCitation: Ge Y C. Radiation properties of high-order harmonic generation for the measurements of femto-and attosecond X-ray pulses.Radiation properties of high-order harmonic generation (HHG) are calculated for atoms in a strong laser field. The laser-duration dependence and the carrier-envelope-phase (CEP) dependence of HHG radiation properties are presented. The CEP dependence of the pure single distribution pulse of HHG radiation properties shows interesting 180° periodic structures. The quantum enhancement of the laser-assisted photo-ionization by femtosecond (1 fs=10 −15 s) and attosecond (1 as=10 −18 s) X-ray pulses and the interference patterns of photo-electron energy spectra are theoretically investigated. Transfer equations are presented for pulse reconstructions. The theoretical root-mean-square time (energy) differences of attosecond pulse reconstructions with different durations are less than 2 as (0.8 eV). These methods may be developed as basic techniques to access ultra-fast measurements and molecular movie.high-order harmonic generation, radiation properties, ultra-fast measurement, transfer equation, laser-phase determination method Electric, scanning tunneling and atomic force microscopes help scientists see interesting images of micro world on atomic scales. Ultra-fast measurement opens a door for scientists to get new knowledge. Usually, we know what happens in a chemical or biochemical reaction, but we do not know how it happens. Knowing how it happens and then regulating or manipulating it is very important for scientific researches. It is well known that the electron and energy transfers in a chemical or biochemical reaction take place on femtosecond and attosecond time scales, and that a molecular vibration period is about a hundred femtoseconds. Up to date, studying and measuring these dynamic processes have been one of the frontier topics that attract increasing attentions. Ultra-fast measurement needs increasingly shorter X-ray pulses, e.g. femto-and attosecond X-ray pulses. In the last three decades, the technique of pump-probe measurement with two delayed light pulses on picosecond time scale has been successfully used in the fast measurements of chemical reaction, biophysics and other fundamental scientific researches. Today, the techniques of synchrotron radiation, 90° Thomson scattering between high energy electrons and laser beam are used to produce femtosecond X-ray pulses. Particularly, highorder harmonic generation (HHG) is a successful way to produce attosecond X-ray pulses. These pulses can help scientists study inner atomic structure, molecular state transition and reaction dynamic process, rather than only the outer atomic structure and the final reaction productions. However, how to measure them remains a challenge.In order to better produce and use the femto-and attosecond X-ray pulses, the pulse properties such as the time distributions of the pulse intensity and frequency (chirp) have to be further studied and experimentally measured.

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Section: Development Of Ultra-fast Measurement Techniquesmentioning

confidence: 99%

Radiation properties of high-order harmonic generation for the measurements of femto- and attosecond X-ray pulses

Yu-Cheng

2009

Chin. Sci. Bull.

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Reversing the typical pH stability profile of the Trp‐cage

et al. 2019

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The Trp‐cage, an 18‐20 residue miniprotein, has emerged as a primary test system for evaluating computational fold prediction and folding rate determination efforts. As it turns out, a number of stabilizing interactions in the Trp‐cage folded state have a strong pH dependence; all prior Trp‐cage mutants have been destabilized under carboxylate‐protonating conditions. Notable among the pH dependent stabilizing interactions within the Trp‐cage are: (1) an Asp as the helix N‐cap, (2) an H‐bonded Asp9/Arg16 salt bridge, (3) an interaction between the chain termini which are in close spatial proximity, and (4) additional side chain interactions with Asp9. In the present study, we have prepared Trp‐cage species that are significantly more stable at pH 2.5 (rather than 7) and quantitated the contribution of each interaction listed above. The Trp‐cage structure remains constant with the pH change. The study has also provided measures of the stabilizing contribution of indole ring shielding from surface exposure and the destabilizing effects of an ionized Asp at the C‐terminus of an α‐helix.

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High energy femtosecond mid-infrared generation pumped by a two-color Ti:sapphire multipass amplifier

Cited by 2 publications

References 16 publications

Radiation properties of high-order harmonic generation for the measurements of femto- and attosecond X-ray pulses

Radiation properties of high-order harmonic generation for the measurements of femto- and attosecond X-ray pulses

Reversing the typical pH stability profile of the Trp‐cage

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