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61.
Polarization control of multi-photon absorption under intermediate femtosecond laser field
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It has been shown that the femtosecond laser polarization modulation is a very simple and well-established method to control the multi-photon absorption process by the light–matter interaction. Previous studies mainly focused on the multiphoton absorption control in the weak field. In this paper, we further explore the polarization control behavior of multiphoton absorption process in the intermediate femtosecond laser field. In the weak femtosecond laser field, the secondorder perturbation theory can well describe the non-resonant two-photon absorption process. However, the higher order nonlinear effect(e.g., four-photon absorption) can occur in the intermediate femtosecond laser field, and thus it is necessary to establish new theoretical model to describe the multi-photon absorption process, which includes the two-photon and four-photon transitions. Here, we construct a fourth-order perturbation theory to study the polarization control behavior of this multi-photon absorption under the intermediate femtosecond laser field excitation, and our theoretical results show that the two-photon and four-photon excitation pathways can induce a coherent interference, while the coherent interference is constructive or destructive that depends on the femtosecond laser center frequency. Moreover, the two-photon and fourphoton transitions have the different polarization control efficiency, and the four-photon absorption can obtain the higher polarization control efficiency. Thus, the polarization control efficiency of the whole excitation process can be increased or decreased by properly designing the femtosecond laser field intensity and laser center frequency. These studies can provide a clear physical picture for understanding and controlling the multi-photon absorption process in the intermediate femtosecond laser field, and also can provide a theoretical guidance for the future experimental realization. 相似文献
62.
In the measurement of fluorescent lifetime based on time correlation-single photon counting technique by means of TAC, due to the contamination of multi-photons a deviation of fluorescent lifetime measured from the expected value is experimentally studied. A correction function instead of a simple exponential function is used to fit the experiment data. The validation of the correction function is checked using the experimental data of several test samples: YAP, NaI(Tl) and LSO. The results show that the correction function well fits the data and the reasonable fluorescent lifetimes are obtained. 相似文献
63.
利用多光子相互作用实现量子信息传递 总被引:2,自引:1,他引:2
利用全量子理论,研究了多原子-腔场系统中多光子相互作用的过程,给出了不同情况下系统的一般演化式,发现利用此过程可实现量子纠缠信息的传递:只要控制腔场与原子相互作用的时间即原子以特定速度通过腔场时,处于基态的原子与存储纠缠信息的腔场相互作用的结果使原子获得量子纠缠信息;相反,纠缠原子中的量子纠缠信息也可传递给处于真空态的腔场;基态原子作为"飞行的量子比特"还可将量子纠缠信息从一个腔场传递到另一个腔场。该结论适应于讨论任意多个原子-腔场系统中任意多个光子相互作用的普遍情形。 相似文献
64.
CHEN Chang-Yong 《理论物理通讯》2008,49(5):1187-1190
We propose an etticient scheme for generating the macroscopic superpositions and the entanglement between the high-order squeezed vacuum states by considering the multi-photon interaction of N two-level atoms in a cavity with high quality factor, assisted by a strong driving field. Through specific choices of the cavity detuning, a number of multi-party entangled states between the atoms and the high-order squeezed vacuum states and among the high-order squeezed vacuum states of the cavities can be prepared, including also the macroscopic "Schrodinger cats" of the high- order squeezed vacuum states, the entangled states of the macroscopic "Schrodinger cats", and so on. Possible extension and application of our scheme are discussed. Our scheme is reachable within the current techniques in the cavity QED. 相似文献
65.
Experimental study of multi-photon contamination on the measurement of fluorescent decay time
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In the measurement of fluorescent lifetime based on time correlation-single photon counting technique by means of TAC, due to the contamination of multi-photons a deviation of fluorescent lifetime measured from the expected value is experimentally studied. A correction function instead of a simple exponential function is used to fit the experiment data. The validation of the correction function is checked using the experimental data of several test samples: YAP, NaI(T1) and LSO. The results show that the correction function well fits the data and the reasonable fluorescent lifetimes are obtained. 相似文献
66.
K. Drese M. Holthaus 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1999,5(1):119-134
We develop adiabatic perturbation theory for quantum systems responding to short laser pulses, with or without a frequency
chirp. Our approach rests on lifting the time-dependent Schr?dinger equation to an extended Hilbert space, then applying standard
perturbational techniques to Floquet states in this extended space, and finally projecting back to the physical Hilbert space.
The same strategy also allows us to construct superadiabatic bases for monitoring the quantum evolution in the course of a
pulse. These bases provide a diagnostic tool for improving the efficiency of pulse-induced population transfer. The formalism
is applied to the selective excitation of molecular vibrational states by chirped laser pulses, which exploit either successive
single-photon resonances or a multiphoton resonance, and by a STIRAP-like process.
Received: 23 June 1998 / Revised: 18 August 1998 / Accepted: 25 August 1998 相似文献
67.
68.
This paper proposes highly charged ions pumped by intense laser to produce very high order harmonics.Numerical simulations and full quantum theory of Ne 9+ ions driven by laser pulses at 1064 nm in the power range of 10 9 W/cm 2 ~ 10 15 W/cm 2 show that the emission spectrum corresponds to the electronic transitions from the excited states to the ground state,which is very different from the spectrum of general high-order harmonic generation.In such situation,harmonic order as high as 1000 can be obtained without producing lower order harmonics and the energy conversion efficiency is close to general high order harmonic generation of hydrogen atom in the same laser field. 相似文献
69.
Christof Maul Mikhail Poretskiy Jörg Grunenberg 《Journal of Molecular Spectroscopy》2009,256(1):80-85
The possibility of simultaneous characterization of N2O and N2O van der Waals complexes in supersonic jet expansions is demonstrated for neat N2O samples. Room temperature and jet-cooled spectra of the Rydberg transitions 3pπ1Δ ←← X1Σ+ and 3pσ1Π ←← X1Σ+ are presented. Theoretical calculations support the assignment of the Rydberg transitions used. For stagnation pressures above 2 bar, a hitherto unreported broad spectral feature at 84 650 cm−1 is observed, where calculations predict absorption of the (N2O)2 dimer essentially due to excitation of the 4sσ and 3pπ Rydberg orbitals. Consequences for the use of N2O as a precursor for O(1D) atoms in reactive scattering experiments are discussed. 相似文献
70.