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Enhanced Harmonic Generation by Bichromatic Laser Fields

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Chinese Physics Letters 2001年第1期18卷 60-62页

作者： WANG Bing-Bing LI Xiao-Feng fu pan-ming Laboratory of Optical Physics Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

With the help of a weak linearly polarized low-frequency field,we study high-order harmonic generation in a circularly polarized high-frequency *** the low-frequency field is not intense enough to ionize the atom,it can accelerate the electron more *** a result,the application of this field can generate harmonics with a much higher energy compared *** monochromatic case.

关键词： polarized harmonics Harmonic

High-Order Harmonic Generation in the Presence of Static Electric Field

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Chinese Physics Letters 1998年第3期15卷 195-197页

作者： WANG Bing-bing LI Xiao-feng fu pan-ming Laboratory of Optical Physics Institute of Physics&Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

We study the effects of the static electric field on the high-order harmonic generation(HOHG).It is found that the presence of the static electric field breaks the inversion and reflection symmetry,as a result,the HOHG spectrum exhibits a double plateau ***,the cutoff of the HOHG is no longer corresponding to the maximum kinetic energy the ionized electron can obtain from the laser ***,it corresponds to the maximum kinetic energy of the electron with one return.

关键词： Presence return Harmonic

Rayleigh-Enhanced Nondegenerate Four-Wave Mixing

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Chinese Physics Letters 1996年第9期13卷 672-674页

作者： YU Zu-he MI Xin JIANG Qian Ll Xiao-feng fu pan-ming Laboratory of Optical Physics Institute of PhysicsChinese Academy of SciencesBeijing 100080

We report a Rayleigh-enhanced nondegenerate four-wave mixing(NFWM)in carbon *** the Rayleigh-enhanced NFWM spectrum a relaxation time of as short as 220fs was deduced.

关键词： Rayleigh relaxation disulfide

Formal Scattering Approach to High-Order Harmonic Generation

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Chinese Physics Letters 1999年第7期16卷 502-504页

作者： GAO Liang-hui LI Xiao-feng GUO Dong-sheng fu pan-ming Laboratory of Optical Physics Institute of Physics&Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080 Department of Physics Southern University and A&M CollegeBaton RougeLouisiana 70813USA

By using the time-independent formal scattering theoretical approach,we develop a nonperturbative quantum electrodynamics theory to describe high-order harmonic generation(HHG).This theory recovers the semi-classical interpretation of Corkum(***.71(1993)1994)and gives the same phenomenological cutoff *** HHG emission rate is expressed as an analytic closed *** also discuss the connection between HHG and the above threshold ionization from the scattering viewpoint.

关键词： form. formal Harmonic

Effects of Field-Correlation on Raman-Enhanced Nondegenerate Four-Wave Mixing Spectra

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Chinese Physics Letters 1997年第4期14卷 277-280页

作者： MI Xin YU Zu-he JIANG Qian LI Xiao-feng fu pan-ming Laboratory of Optical Physics Institute of Physics&Center for Condensed MatterChinese Academy of SciencesBeijing 100080

The effects of field correlation on Raman-enhanced nondegenerate four-wave mixing(REN-FWM)have been investigated by examining the RENFWM spectra as a function of time delay between two *** enhancement of the ratio between the resonant and nonresonant REN-FWM signal intensities was found as the time delay was increased when the laser had broadband linewidth.

关键词： delay degenerate resonant

Ultrafast Modulation Spectroscopy in Four-Level System

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Chinese Physics Letters 1998年第6期15卷 420-422页

作者： YU Zu-he MI Xin JIANG Qian LI Xiao-feng fu pan-ming Laboratory of Optical Physics Institute of Physics&Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

Based on the interference between two two-photon processes,we reported a four-level ultrafast modulation spectroscopy in Na vapor,where 3S,3P,5S,and 4D formed a four-level *** studied the temporal behavior of the four-wave mixing signal intensity and obtained signal modulation with period 25fs,corresponding to the splitting between 5s and *** technique can achieve Doppler-free precision in the measurement of the energy level splitting between two excited states which are dipolar forbidden from the ground state.

关键词： state splitting excited

Observation of Rydberg Series in Sodium Vapour by Two-Photon Resonant Nondegenerate Four-Wave Mixing

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Chinese Physics Letters 2001年第9期18卷 1202-1204页

作者： WANG Yan-Bang JIANG Qian LI Long MI Xin YU Zu-He fu pan-ming Laboratory of Optical Physics Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state for the obser- vation of Rydberg states in sodium vapour. The broadening and shift of the sodium 3S- 11D transition perturbed by argon are investigated. This technique can achieve Doppler-free resolution of narrow spectral structures of Rydberg levels if lasers with narrow bandwidths are employed.

关键词： Rydberg degenerate resonant

Fourth-Order Interference on Polarization Beats with Phase-Conjugation Geometry

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Chinese Physics Letters 2000年第3期17卷 206-208页

作者： ZHANG Yau-Peng SUN Li-Qun TANG Tian-Tong ZHANG Lu fu pan-ming Department of Electronic Science and Technology Xi'an Jiaotong UniversityXi'an 710049 Institute of Physics Chinese Academy of SciencesBeijing 100080

The effect of fourth-order coherence on ultrafast modulation spectroscopy(UMS)with phase-conjugation geome-try(PCUMS)in a cascade three-level system is investigated using chaotic and phase-diffusion *** has been found that the modulation terms of the beat signal depend *** second-order coherence function,and different stochastic models of the laser field affect only the fourth-order coherence *** difference between the PCUMS and UMS is discussed from a physical viewpoint.

关键词： function. MS Polarization

Phase-Sensitive Detection of Raman-Enhanced Nondegenerate Four-Wave Mixing by Polarization Interference

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Chinese Physics Letters 2001年第1期18卷 54-56页

作者： JIANG Qian MI Xin YU Zu-He WANG Yan-Bang WANG Li-Jun fu pan-ming Laboratory of Optical Physics Institute of Physics&Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080

We demonstrated a phase-sensitive method for studying the Raman-enhanced nondegenerate four-wave mixing(RENFWM).The reference beam is another four-wave mixing signal,which propagates along the same optical path as the RENFWM *** method is used for studying the phase dispersion of the third-ordersusceptibility X^((3))and for the optical heterodyne detection of the RENFWM signal.

关键词： optical FWM mixing