Two-photon gain without inversion vs. linear absorption in a three-level scheme

Koganov, Gennady A.; Shuker, R.

doi:10.1134/s1054660x11130160

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…Experimental realization of such schemes have been demonstrated [9][10][11][12][13]. The key mechanism, which is common to most of the proposed schemes, is the uti lization of external coherent fields that induce quan tum coherence and interference in multi level systems.…”

Section: Introductionmentioning

confidence: 97%

Counterintuitive Gaussian pulse sequence in three-level ladder scheme

et al. 2012

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In a recent publication we have studied counterintuitive pulse sequence applied to a three level lad der scheme, utilizing rectangular shaped pulses. In this research we investigate amplification without popula tion inversion in a three level ladder system interacting with two electromagnetic fields, namely, the probe and coupling fields. We take both probe and drive fields in the form of Gaussian shaped pulses. In a counterintuitive sequence scheme, the short probe pulse is introduced prior to the application of the coupling field, in contrast to a regular sequence scheme, where both fields are introduced at the same time. The influence of varying the probe pulse width and time delay between the initiation times of the probe and coupling fields on transient probe gain is investigated. It is found that the system exhibits a kind of memory about previously applied weak probe pulse. This may allow for detection of the past event by applying a strong drive pulse in the future.

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Section: Introductionmentioning

confidence: 97%

Counterintuitive Gaussian pulse sequence in three-level ladder scheme

et al. 2012

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“…In this paper we report the theoretical development of a novel source for second harmonic generation, free of such demands, which is based on a different physical phenomenon, a field driven super-or sub radiant lasing proposed recently in [3,4]. A three-level system driven by two lasers, considered in [3], is intrinsically nonlinear with respect to the driving fields [5]. We utilize this nonlinearity to obtain SHG in super/subradiant regimes.…”

Section: Introductionmentioning

confidence: 99%

Super/subradiant second harmonic generation

Koganov¹,

Shuker²

2017

Laser Phys. Lett.

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A scheme for active second harmonics generation is suggested. The system comprises N three-level atoms in ladder configuration, situated into resonant cavity. It is found that the system can lase in either superradiant or subradiant regime, depending on the number of atoms N. When N passes some critical value the transition from the super to subradiance occurs in a phase-transition-like manner. Stability study of the steady state supports this conclusion.

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“…By employing specially tailored ultrashort laser pulses, ultrafast atomic and molecular dynamics were controlled in a precise and effective manner via manipulation of quantum interference [14][15][16][17][18][19][20][21][22][23][24][25]. In an atomic system, the probability of non-resonant TPA (i.e.…”

Section: Introductionmentioning

confidence: 99%

Coherent quantum control of two-photon absorption and polymerization by shaped ultrashort laser pulses

Cheng

Zhang

et al. 2013

Laser Phys. Lett.

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The polymerization and feature size in micro/nanofabrication are usually controlled by changing the femtosecond laser pulse energy and irradiation pulse number. In this paper, we present the coherent control of two-photon absorption (TPA) and polymerization in a polymer with a isopropyl thioxanthone (ITX) photoinitiator by modulating the phase of 800 nm femtosecond laser pulses. We demonstrate experimentally and theoretically that the TPA probability and polymerization can be efficiently controlled by shaped ultrashort laser pulses. By using this method, the volume of a fabricated microrod decreases to 1/125 of that induced by Fourier transform limit laser pulses, and it is less than 1/25 of the diffraction limit.

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Two-photon gain without inversion vs. linear absorption in a three-level scheme

Cited by 4 publications

References 15 publications

Counterintuitive Gaussian pulse sequence in three-level ladder scheme

Counterintuitive Gaussian pulse sequence in three-level ladder scheme

Super/subradiant second harmonic generation

Coherent quantum control of two-photon absorption and polymerization by shaped ultrashort laser pulses

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