Determination of Optimum Conditions for Reproducing Information in Optical Echo Processors

This paper discusses how external spatially inhomogeneous electric fields affect information reproduction in the stimulated-photon-echo response in a three-level system when the information is encoded in the temporal shape of the object pulse and in the time intervals of an echelon of laser pulses taken as the object pulse. The information-locking effect for various encoding schemes is investigated for various unequal spacings of the spectrum of a three-level system.

show abstract

“…[16][17][18] In this case, the spatiotemporal structure of the SPE response is determined by a similar expression, obtained in Ref. 11: …”

Section: The Principal Equationsmentioning

confidence: 88%

Recording and reproducing information with various encoding schemes, using stimulated photon echo in a three-level system

et al. 2014

View full text Add to dashboard Cite

show abstract

“…To obtain the evolution operator of the system upon its excitation by the information-carrying resonance laser pulse of duration Δt η , we adopt the results of [10]. Knowing the evolution operator U , we determine the density matrix after the action of an ηth laser pulse…”

Section: Information Flow Density In the Spe Response In A Three-levementioning

confidence: 99%

Change in Information Flow Density in Optical Echo Processors

Sakhbieva

Nefediev

2014

J Russ Laser Res

Self Cite

View full text Add to dashboard Cite

show abstract

“…Between the fi rst and second laser pulses and after the third readout pulse, the three-level system is exposed to nonresonant standing waves SW1 and SW2. The pulse SW1 is oriented along the z axis; SW2 is oriented along the z′ axis, making an angle β to the z axis.In order to look for the evolution operator for the system when it is excited by a resonant laser pulse of duration Δt η at the instant of time t η , we use the results of [7]. Knowing the evolution operator, we can determine the density matrix after action of the η-th laser pulse…”

mentioning

confidence: 99%

“…In order to look for the evolution operator for the system when it is excited by a resonant laser pulse of duration Δt η at the instant of time t η , we use the results of [7]. Knowing the evolution operator, we can determine the density matrix after action of the η-th laser pulse…”

mentioning

confidence: 99%

Effectiveness of Locking a Stimulated Photon Echo in a Three-Level System, Depending on the Mutual Orientation of Standing Waves of Nonresonant Laser Pulses

2014

Self Cite

View full text Add to dashboard Cite

We consider the effectiveness of locking the stimulated photon echo response in a three-level system, depending on the mutual orientation of external nonresonant electromagnetic standing waves. We show that the effect of locking the stimulated photon echo response depends on the "non-equidistance" parameter for the spectrum of the system. Keywords: stimulated photon echo, three-level system, information ″locking,″ nonresonant electromagnetic standing waves.Introduction. Photon echo is widely used in optical spectroscopy, and also in optical memory devices and processors [1], for operation of which we need an effi cient mechanism for erasing information. In [2,3], it is shown that the effect of locking the stimulated photon echo (SPE) signals is promising for solving such problems. The effect of locking a long-lived photon echo was predicted theoretically and confi rmed experimentally for an LaF 3 Pr 3+ crystal (the transition 3 H 4 -3 P 0 , λ = 477.7 nm) when an inhomogeneous electric fi eld is applied between the fi rst and second laser pulses [2]. In [3][4][5], the effect of locking information in SPE responses and its application in optical memory systems, echo processors, and multichannel recording of information were considered, as well as the effectiveness of suppressing the SPE response for different schemes for application of spatially inhomogeneous electric fi elds to a resonant medium. Such an effect can be achieved by exposure to nonresonant laser pulses with spatial inhomogeneity or standing-wave pulses, where the spatial inhomogeneity is connected with the electric fi eld distribution in the antinodes of the standing waves. In [6], we considered the effectiveness of locking a long-lived photon echo as a function of the mutual orientation of standing waves of nonresonant laser pulses in a two-level system, and showed that "locking" information in the SPE response is observed even at angles <0.1°.In this paper, we consider the effectiveness of locking the SPE response in a three-level system for a mutual orientation of external nonresonant electromagnetic standing waves.Basic Equations. Let us consider the excitation scheme for an SPE in a three-level system. Let the object pulse be the fi rst exciting laser pulse, the temporal shape of which we represent as a step (Fig. 1). Between the fi rst and second laser pulses and after the third readout pulse, the three-level system is exposed to nonresonant standing waves SW1 and SW2. The pulse SW1 is oriented along the z axis; SW2 is oriented along the z′ axis, making an angle β to the z axis.In order to look for the evolution operator for the system when it is excited by a resonant laser pulse of duration Δt η at the instant of time t η , we use the results of [7]. Knowing the evolution operator, we can determine the density matrix after action of the η-th laser pulse

show abstract

Determination of Optimum Conditions for Reproducing Information in Optical Echo Processors

Cited by 8 publications

References 2 publications

Recording and reproducing information with various encoding schemes, using stimulated photon echo in a three-level system

Recording and reproducing information with various encoding schemes, using stimulated photon echo in a three-level system

Change in Information Flow Density in Optical Echo Processors

Effectiveness of Locking a Stimulated Photon Echo in a Three-Level System, Depending on the Mutual Orientation of Standing Waves of Nonresonant Laser Pulses

Contact Info

Product

Resources

About