Theory of selective excitation in stimulated Raman scattering

Malinovskaya, Svetlana; Bucksbaum, P. H.; Berman, P. R.

doi:10.1103/physreva.69.013801

Cited by 28 publications

(17 citation statements)

References 10 publications

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“…If two TLSs are uncoupled, a single state population can reach the maximum value of 0.5; however, if two TLSs are coupled (for details see the next section) a single state population can range from zero to 1. The parameters of the fields and the systems used in numerical calculations correlate with experimental conditions discussed in [11,12] and also used in [13]. We addressed two Raman-active vibrational modes ω 21 = 84.9 THz (2840 cm −1 ), the symmetric stretch, and ω 43 = 87.6 THz (2930 cm −1 ), the asymmetric stretch, in methanol.…”

Section: Numerical Results For the Model Of Two Uncoupled Two-lementioning

confidence: 99%

Nonadiabatic effects induced by the coupling between vibrational modes via Raman fields

Patel

Malinovskaya

2011

Phys. Rev. A

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We study the effect of coupling between molecular vibrational modes attendant the excitation of Raman transitions using ultrafast chirped laser pulses. We model Raman-active vibrational modes by two-level systems (TLSs) with nondegenerate ground states and a predetermined initial relative phase. Chirp of the pump and Stokes pulses is the same in magnitude and opposite in sign for the whole pulse duration. To reveal the nonadiabatic effects induced by the coupling between the vibrational modes, we compare the model of two uncoupled TLSs with the one of two TLSs coupled by the external fields. The first model shows population inversion. Within the second model, the coupling induces nonadiabatic effects leading to a mixed population distribution. By introducing the time delay between the Stokes and pump pulses, nearly complete population transfer is realized in both coupled TLSs.

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Section: Numerical Results For the Model Of Two Uncoupled Two-lementioning

confidence: 99%

Nonadiabatic effects induced by the coupling between vibrational modes via Raman fields

Patel

Malinovskaya

2011

Phys. Rev. A

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“…The basic parameters are listed in Table 3. The light pulse with the wavelength of 354.7 nm is used for exciting nitrogen and water vapor molecule to Raman excitation of vibrational modes (Malinovskaya et al, 2004). The backscattered light at the wavelengths of 532 and 1064 nm is utilized for the detection of aerosol and cloud.…”

Section: Lidar Technology and Methodologymentioning

confidence: 99%

Observations of water vapor mixing ratio profile and flux in the Tibetan Plateau based on the lidar technique

Dai

Song

et al. 2016

Atmos. Meas. Tech.

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Abstract. As a part of the third Tibetan Plateau Experiment of Atmospheric Sciences (TIPEX III) in China, a Raman water vapor, cloud and aerosol lidar and a coherent wind lidar were operated in Naqu (31.48 • N, 92.06 • E) with a mean elevation of more than 4500 m a.m.s.l. in summer of 2014. During the field campaign, the water vapor mixing ratio profiles were obtained and validated by radiosonde observations. The mean water vapor mixing ratio in Naqu in July and August was about 9.4 g kg −1 and the values vary from 6.0 to 11.7 g kg −1 near the ground according to the lidar measurements, from which a diurnal variation of water vapor mixing ratio in the planetary boundary layer was also illustrated in this high-elevation area. Furthermore, using concurrent measurements of vertical wind speed profiles from the coherent wind lidar, we calculated the vertical flux of water vapor that indicates the water vapor transport through updraft and downdraft. The fluxes were for a case at night with largescale non-turbulent upward transport of moisture. It is the first application, to our knowledge, to operate continuously atmospheric observations by utilizing multi-disciplinary lidars at the altitude higher than 4000 m, which is significant for research on the hydrologic cycle in the atmospheric boundary layer and lower troposphere in the Tibetan Plateau.

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“…In fact, many actual systems do not satisfy the convergence conditions mentioned above, such as the time domain model of the selective excitation of the stimulated Raman scattering [43], the coupled two spin systems, and onedimensional oscillators [44]. These systems are called nonideal systems and in the degenerate cases.…”

Section: Introductionmentioning

confidence: 99%

A Survey of Quantum Lyapunov Control Methods

Cong

Meng

2013

The Scientific World Journal

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The condition of a quantum Lyapunov-based control which can be well used in a closed quantum system is that the method can make the system convergent but not just stable. In the convergence study of the quantum Lyapunov control, two situations are classified: nondegenerate cases and degenerate cases. For these two situations, respectively, in this paper the target state is divided into four categories: the eigenstate, the mixed state which commutes with the internal Hamiltonian, the superposition state, and the mixed state which does not commute with the internal Hamiltonian. For these four categories, the quantum Lyapunov control methods for the closed quantum systems are summarized and analyzed. Particularly, the convergence of the control system to the different target states is reviewed, and how to make the convergence conditions be satisfied is summarized and analyzed.

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Theory of selective excitation in stimulated Raman scattering

Cited by 28 publications

References 10 publications

Nonadiabatic effects induced by the coupling between vibrational modes via Raman fields

Nonadiabatic effects induced by the coupling between vibrational modes via Raman fields

Observations of water vapor mixing ratio profile and flux in the Tibetan Plateau based on the lidar technique

A Survey of Quantum Lyapunov Control Methods

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