Arlene Gordon - Academia.edu (original) (raw)

Papers by Arlene Gordon

Research paper thumbnail of Origin of the Reaction of Probe Spectra on the Coupling Pump Laser Absorption

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007

ABSTRACT In this paper it is shown that the effect of the probe spectrum on the pump absorption r... more ABSTRACT In this paper it is shown that the effect of the probe spectrum on the pump absorption results from a probe-frequency-dependent modulation of the populations of the states involved in the transitions interacting with the radiation. We distinguish between two elementary situations: 1. simple two-level systems and V-tvpe three-level systems and 2. Lambda-tvpe three-level systems. In a four-level V-type configuration, where the two vertical legs represent the transitions that interact with the pump(s), and the diagonal leg represents the transition that interacts with the probe. There are two contributions to the pump spectrum. The left-hand transition corresponds to a Lambda-tvpe situation and the right-hand transition to a V-type situation.

Research paper thumbnail of Coherence-population-trapping transients induced by an ac magnetic field

Research paper thumbnail of Coherent-population-trapping transients induced by a modulated transverse magnetic field

Research paper thumbnail of Efficient light storage in a Λ system due to coupling between lower levels

Optics Letters, 2009

ABSTRACT We show analytically and numerically that the application, during the storage time, of a... more ABSTRACT We show analytically and numerically that the application, during the storage time, of an additional weak field connecting the lower levels (LLs) of a Lambda system can modify the spin coherence and the amplitude of the retrieved probe without causing distortion. The LL coupling field adds an additional phase-dependent term to the probe propagation equation. The retrieved probe is amplified when the total relative phase Phi=0 or pi and decreased when Phi=pi/2.

Research paper thumbnail of Phase and amplitude control of the group velocity in a two-level system with shelving state

Optics Communications, 2010

We study the propagation of two weak light pulses with the same temporal shape, symmetrically det... more We study the propagation of two weak light pulses with the same temporal shape, symmetrically detuned from a stronger cw pump, in a two-level system which decays via a shelving state. We show that the group velocity of the weak pulses can be controlled, with small distortion, by modifying either the relative amplitude of the weak pulses or the total phase Φ. The changes in the local group velocity on propagation are due to pump absorption, and to changes in the total phase on propagation which occur for all cases apart from the case where the amplitudes of the weak fields are equal and Φ = 0 or π. Slow light occurs when the initial total phase Φ = 0; π = 2 but not when Φ = π; when one pulse is less intense than the other, it experiences the greater slowing down, and the effect is greater than in the case of equal intensities.

Research paper thumbnail of On the Pump Intensity Dependence of Probe Noise, Absorption and Dispersion in a Driven Two-Level System at Points of Zero Absorption and in the Dead-Zone

Journal of Nonlinear Optical Physics & Materials, 1996

We investigate the quantum noise gained by a weak probe laser interacting with a driven two-level... more We investigate the quantum noise gained by a weak probe laser interacting with a driven two-level system at points of zero absorption and in the dead-zone. We find that in the Doppler-limit, maximum noise is obtained at the extremum point of the probe dispersion curve as a function of the pump intensity. This implies that in this limit, the noise is maximal at the transition point between focusing and defocusing. On the other hand, in the absence of Doppler broadening, this is true only for the case of a resonant pump.

Research paper thumbnail of Sub-Doppler features due to double dark resonances

Optics Communications, 2009

ABSTRACT A sharp intense sub-Doppler feature is predicted in the probe absorption spectrum of an ... more ABSTRACT A sharp intense sub-Doppler feature is predicted in the probe absorption spectrum of an atomic four-level system when a hyperfine-split state interacts with a single pump. The sub-Doppler feature, which is flanked by two power-broadened transparency windows, is obtained when the frequency of the pump is greater than that of the probe, and the residual Doppler broadening is significant.

Research paper thumbnail of Control of group velocity by phase-changing collisions

Research paper thumbnail of Control of group velocity of light by phase-changing collisions

EQEC '05. European Quantum Electronics Conference, 2005.

Research paper thumbnail of Interview with Prof. Leeor Kronik – recipient of the 2021 ICS outstanding scientist prize

Research paper thumbnail of Saturation-induced distortion of four-wave-mixing spectra in a two-level system

Physical Review A, 1988

It is shown that saturation causes the three-peaked four-wave-mixing (FWM) signal at frequency 2'... more It is shown that saturation causes the three-peaked four-wave-mixing (FWM) signal at frequency 2'&-&, obtained from the interaction of a two-level system with a "probe" laser of varying frequency co2 and a "pump" laser of fixed frequency co&, to become asymmetrical on increasing the probe-laser intensity. Whereas saturation peaks occur in the population-inversion spectrum at onephoton and multiphoton resonances, this is not so for the FWM spectrum, where often the peaks correspond to nothing more than minima in the population-inversion spectrum.

Research paper thumbnail of Dispersion profiles of the absorptive response of a two-level system interacting with two intense fields

Physical Review A, 1987

When a two-level system interacts resonantly with a saturating pump laser, the absorption profile... more When a two-level system interacts resonantly with a saturating pump laser, the absorption profile of a probe wave in the Rabi sidebands resembles two separate dispersion profiles. At sufficiently high probe intensity this effect is accompanied by a dispersive profile in the pump-wave absorption, considered as a function of the probe-wave frequency, and also by a dip in the population of the upper state of the two-level system. The relative stabilization of the ground state is interpreted in terms of two-laser-photon processes where absorption of a pump (probe) photon is followed by stimulated emission of a probe (pump) photon. The dispersive absorption profile is attributed to the competition between threeand four-photon scattering processes.

Research paper thumbnail of Extrarresonant stimulated Rayleigh scattering from a two-level system interacting with two intense fields

AIP Conference Proceedings, 1988

ABSTRACT

Research paper thumbnail of Two-photon resonance on the D2line of Cs enhanced by optical pumping

Journal of Physics: Conference Series, 2015

Sub-natural-width N-type resonance, observed in the D 2 line of Cs vapor has been reported recent... more Sub-natural-width N-type resonance, observed in the D 2 line of Cs vapor has been reported recently. Three-photon, bi-chromatic excitation of Cs atomic vapor with 20 Torr of Neon was performed and a sub-natural-width resonance was observed, superimposed on the absorption profile of a set of hyperfine transitions starting from single hyperfine ground level. Here we report the study of a different three-photon, couple-probe-excitation scheme that allows the observation of a sub-natural-width resonance situated on a flat background, well outside the D 2 line absorption spectrum of Cs. The lack of a noisy background could be advantageous for many applications related to the narrow N resonance. In addition, a new broader feature of enhanced transparency is demonstrated that is centered at the ground state level that does not interacting with the coupling beam. This enhanced transparency resonance can be attributed to the atomic population loss in a narrow spectral interval occurring due to excitation of energy levels situated above the 6 2 P levels.

Research paper thumbnail of Effective two-level Hamiltonian for coherent multiphoton processes

Optics Communications, 1978

The adiabatic following model of two-photon coherent excitation of Grischkowsky, Loy and Liao has... more The adiabatic following model of two-photon coherent excitation of Grischkowsky, Loy and Liao has been extended to multiphoton excitation using projection operator techniques. The solutions of the generalized Bloch equations are given in the sudden switching, adiabatic following and steady state limits. The theory is used to discuss various models of collisionless multiphoton dissociation of polyatomic molecules.

Research paper thumbnail of Quantum noise characteristics of gain experienced by a weak probe propagating through a medium of driven two- or three-level atoms

Proceedings of 5th European Quantum Electronics Conference

Research paper thumbnail of Correlation between gain without inversion, enhanced refractive index and noise in a lambda three-level system

Optics Communications, 1994

The gain, the refractive index and the noise on the gain are analysed for the case of a weak prob... more The gain, the refractive index and the noise on the gain are analysed for the case of a weak probe propagating through a medium of driven degenerate A three-level atoms. They are all found to have the same linear dependence on the rate of the collisional relaxation rate between the two low-lying states of the A three-level system. This indicates that a correlation exists between the gain without inversion, the enhanced refractive index and noise in this system. Furthermore, the maxima in the noise occur at the points of non-absorption in the gain spectrum which are also the extremum points in the refractive index spectrum.

Research paper thumbnail of Phase control reduction of four-wave mixing in induced waveguiding scheme

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)

Summary form only given. We investigate the waveguiding induced in a weak probe propagating in a ... more Summary form only given. We investigate the waveguiding induced in a weak probe propagating in a medium of two-level atoms driven by a copropagating, intense, strongly detuned pump. We show that when the transverse profile of the pump exhibits solitonlike oscillations, similar oscillations can be induced in the transverse profile of the probe. The pump acts as a spatial soliton

Research paper thumbnail of Group velocity reduction by decay-induced interference

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)

Summary form only given. We exploit decay-induced interference effects in order to slow down ligh... more Summary form only given. We exploit decay-induced interference effects in order to slow down light propagation. The system we investigate is a V-shaped closed three-level system, with lower level |1> and upper levels |2> and |3>. The upper levels are coupled to the lower level by the vacuum modes. This interaction produces the usual relaxation processes of spontaneous emission from

Research paper thumbnail of Four-Wave Mixing with Short Temporally Nonoverlapping Pulses

The Journal of Physical Chemistry A, 1998

... University, Ramat Gan 52900, Israel. J. Phys. Chem. ... Soc. Am.B1995, 12, 1909. (15) Miklasz... more ... University, Ramat Gan 52900, Israel. J. Phys. Chem. ... Soc. Am.B1995, 12, 1909. (15) Miklaszewski, W.; Fiutak, J. Z. Phys. B1994, 93, 491. (16) Alhasan, AM; Fiutak, J.; Miklaszewski, W. Z. Phys. B 1992, 88, 349. (17) Ranka, JK; Shirmer, RW; Gaeta, A. Phys. Rev. A1998, 57, R36. ...

Research paper thumbnail of Origin of the Reaction of Probe Spectra on the Coupling Pump Laser Absorption

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007

ABSTRACT In this paper it is shown that the effect of the probe spectrum on the pump absorption r... more ABSTRACT In this paper it is shown that the effect of the probe spectrum on the pump absorption results from a probe-frequency-dependent modulation of the populations of the states involved in the transitions interacting with the radiation. We distinguish between two elementary situations: 1. simple two-level systems and V-tvpe three-level systems and 2. Lambda-tvpe three-level systems. In a four-level V-type configuration, where the two vertical legs represent the transitions that interact with the pump(s), and the diagonal leg represents the transition that interacts with the probe. There are two contributions to the pump spectrum. The left-hand transition corresponds to a Lambda-tvpe situation and the right-hand transition to a V-type situation.

Research paper thumbnail of Coherence-population-trapping transients induced by an ac magnetic field

Research paper thumbnail of Coherent-population-trapping transients induced by a modulated transverse magnetic field

Research paper thumbnail of Efficient light storage in a Λ system due to coupling between lower levels

Optics Letters, 2009

ABSTRACT We show analytically and numerically that the application, during the storage time, of a... more ABSTRACT We show analytically and numerically that the application, during the storage time, of an additional weak field connecting the lower levels (LLs) of a Lambda system can modify the spin coherence and the amplitude of the retrieved probe without causing distortion. The LL coupling field adds an additional phase-dependent term to the probe propagation equation. The retrieved probe is amplified when the total relative phase Phi=0 or pi and decreased when Phi=pi/2.

Research paper thumbnail of Phase and amplitude control of the group velocity in a two-level system with shelving state

Optics Communications, 2010

We study the propagation of two weak light pulses with the same temporal shape, symmetrically det... more We study the propagation of two weak light pulses with the same temporal shape, symmetrically detuned from a stronger cw pump, in a two-level system which decays via a shelving state. We show that the group velocity of the weak pulses can be controlled, with small distortion, by modifying either the relative amplitude of the weak pulses or the total phase Φ. The changes in the local group velocity on propagation are due to pump absorption, and to changes in the total phase on propagation which occur for all cases apart from the case where the amplitudes of the weak fields are equal and Φ = 0 or π. Slow light occurs when the initial total phase Φ = 0; π = 2 but not when Φ = π; when one pulse is less intense than the other, it experiences the greater slowing down, and the effect is greater than in the case of equal intensities.

Research paper thumbnail of On the Pump Intensity Dependence of Probe Noise, Absorption and Dispersion in a Driven Two-Level System at Points of Zero Absorption and in the Dead-Zone

Journal of Nonlinear Optical Physics & Materials, 1996

We investigate the quantum noise gained by a weak probe laser interacting with a driven two-level... more We investigate the quantum noise gained by a weak probe laser interacting with a driven two-level system at points of zero absorption and in the dead-zone. We find that in the Doppler-limit, maximum noise is obtained at the extremum point of the probe dispersion curve as a function of the pump intensity. This implies that in this limit, the noise is maximal at the transition point between focusing and defocusing. On the other hand, in the absence of Doppler broadening, this is true only for the case of a resonant pump.

Research paper thumbnail of Sub-Doppler features due to double dark resonances

Optics Communications, 2009

ABSTRACT A sharp intense sub-Doppler feature is predicted in the probe absorption spectrum of an ... more ABSTRACT A sharp intense sub-Doppler feature is predicted in the probe absorption spectrum of an atomic four-level system when a hyperfine-split state interacts with a single pump. The sub-Doppler feature, which is flanked by two power-broadened transparency windows, is obtained when the frequency of the pump is greater than that of the probe, and the residual Doppler broadening is significant.

Research paper thumbnail of Control of group velocity by phase-changing collisions

Research paper thumbnail of Control of group velocity of light by phase-changing collisions

EQEC '05. European Quantum Electronics Conference, 2005.

Research paper thumbnail of Interview with Prof. Leeor Kronik – recipient of the 2021 ICS outstanding scientist prize

Research paper thumbnail of Saturation-induced distortion of four-wave-mixing spectra in a two-level system

Physical Review A, 1988

It is shown that saturation causes the three-peaked four-wave-mixing (FWM) signal at frequency 2'... more It is shown that saturation causes the three-peaked four-wave-mixing (FWM) signal at frequency 2'&-&, obtained from the interaction of a two-level system with a "probe" laser of varying frequency co2 and a "pump" laser of fixed frequency co&, to become asymmetrical on increasing the probe-laser intensity. Whereas saturation peaks occur in the population-inversion spectrum at onephoton and multiphoton resonances, this is not so for the FWM spectrum, where often the peaks correspond to nothing more than minima in the population-inversion spectrum.

Research paper thumbnail of Dispersion profiles of the absorptive response of a two-level system interacting with two intense fields

Physical Review A, 1987

When a two-level system interacts resonantly with a saturating pump laser, the absorption profile... more When a two-level system interacts resonantly with a saturating pump laser, the absorption profile of a probe wave in the Rabi sidebands resembles two separate dispersion profiles. At sufficiently high probe intensity this effect is accompanied by a dispersive profile in the pump-wave absorption, considered as a function of the probe-wave frequency, and also by a dip in the population of the upper state of the two-level system. The relative stabilization of the ground state is interpreted in terms of two-laser-photon processes where absorption of a pump (probe) photon is followed by stimulated emission of a probe (pump) photon. The dispersive absorption profile is attributed to the competition between threeand four-photon scattering processes.

Research paper thumbnail of Extrarresonant stimulated Rayleigh scattering from a two-level system interacting with two intense fields

AIP Conference Proceedings, 1988

ABSTRACT

Research paper thumbnail of Two-photon resonance on the D2line of Cs enhanced by optical pumping

Journal of Physics: Conference Series, 2015

Sub-natural-width N-type resonance, observed in the D 2 line of Cs vapor has been reported recent... more Sub-natural-width N-type resonance, observed in the D 2 line of Cs vapor has been reported recently. Three-photon, bi-chromatic excitation of Cs atomic vapor with 20 Torr of Neon was performed and a sub-natural-width resonance was observed, superimposed on the absorption profile of a set of hyperfine transitions starting from single hyperfine ground level. Here we report the study of a different three-photon, couple-probe-excitation scheme that allows the observation of a sub-natural-width resonance situated on a flat background, well outside the D 2 line absorption spectrum of Cs. The lack of a noisy background could be advantageous for many applications related to the narrow N resonance. In addition, a new broader feature of enhanced transparency is demonstrated that is centered at the ground state level that does not interacting with the coupling beam. This enhanced transparency resonance can be attributed to the atomic population loss in a narrow spectral interval occurring due to excitation of energy levels situated above the 6 2 P levels.

Research paper thumbnail of Effective two-level Hamiltonian for coherent multiphoton processes

Optics Communications, 1978

The adiabatic following model of two-photon coherent excitation of Grischkowsky, Loy and Liao has... more The adiabatic following model of two-photon coherent excitation of Grischkowsky, Loy and Liao has been extended to multiphoton excitation using projection operator techniques. The solutions of the generalized Bloch equations are given in the sudden switching, adiabatic following and steady state limits. The theory is used to discuss various models of collisionless multiphoton dissociation of polyatomic molecules.

Research paper thumbnail of Quantum noise characteristics of gain experienced by a weak probe propagating through a medium of driven two- or three-level atoms

Proceedings of 5th European Quantum Electronics Conference

Research paper thumbnail of Correlation between gain without inversion, enhanced refractive index and noise in a lambda three-level system

Optics Communications, 1994

The gain, the refractive index and the noise on the gain are analysed for the case of a weak prob... more The gain, the refractive index and the noise on the gain are analysed for the case of a weak probe propagating through a medium of driven degenerate A three-level atoms. They are all found to have the same linear dependence on the rate of the collisional relaxation rate between the two low-lying states of the A three-level system. This indicates that a correlation exists between the gain without inversion, the enhanced refractive index and noise in this system. Furthermore, the maxima in the noise occur at the points of non-absorption in the gain spectrum which are also the extremum points in the refractive index spectrum.

Research paper thumbnail of Phase control reduction of four-wave mixing in induced waveguiding scheme

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)

Summary form only given. We investigate the waveguiding induced in a weak probe propagating in a ... more Summary form only given. We investigate the waveguiding induced in a weak probe propagating in a medium of two-level atoms driven by a copropagating, intense, strongly detuned pump. We show that when the transverse profile of the pump exhibits solitonlike oscillations, similar oscillations can be induced in the transverse profile of the probe. The pump acts as a spatial soliton

Research paper thumbnail of Group velocity reduction by decay-induced interference

Conference Digest. 2000 International Quantum Electronics Conference (Cat. No.00TH8504)

Summary form only given. We exploit decay-induced interference effects in order to slow down ligh... more Summary form only given. We exploit decay-induced interference effects in order to slow down light propagation. The system we investigate is a V-shaped closed three-level system, with lower level |1> and upper levels |2> and |3>. The upper levels are coupled to the lower level by the vacuum modes. This interaction produces the usual relaxation processes of spontaneous emission from

Research paper thumbnail of Four-Wave Mixing with Short Temporally Nonoverlapping Pulses

The Journal of Physical Chemistry A, 1998

... University, Ramat Gan 52900, Israel. J. Phys. Chem. ... Soc. Am.B1995, 12, 1909. (15) Miklasz... more ... University, Ramat Gan 52900, Israel. J. Phys. Chem. ... Soc. Am.B1995, 12, 1909. (15) Miklaszewski, W.; Fiutak, J. Z. Phys. B1994, 93, 491. (16) Alhasan, AM; Fiutak, J.; Miklaszewski, W. Z. Phys. B 1992, 88, 349. (17) Ranka, JK; Shirmer, RW; Gaeta, A. Phys. Rev. A1998, 57, R36. ...