Femtosecond superradiant emission in inorganic semiconductors

Vasil'ev, Petr P

doi:10.1088/0034-4885/72/7/076501

Cited by 43 publications

(52 citation statements)

References 77 publications

(176 reference statements)

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“…Likewise, the interaction between the SR sample and the external radiation field can be visualized in the uncoupled basis with the same diagram as in figure 6 (with the appropriate basis, i.e., replacing in the figure b c , 1; , 0ñ | with c 1; , 0ñ | , etc.). Accordingly, the eigenvalues of these new dressed states are reminiscent (though not the same) as those found in equations (13)- (16) and suggest that we can make the following approximate substitution…”

supporting

confidence: 54%

Interacting superradiance samples: modified intensities and timescales, and frequency shifts

Houde

Rajabi

2018

J. Phys. Commun.

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We consider the interaction between distinct superradiance (SR) systems and use the dressed state formalism to solve the case of two interacting two-atom SR samples at resonance. We show that the ensuing entanglement modifies the transition rates and intensities of radiation, as well as introduces a potentially measurable frequency chirp in the SR cascade, the magnitude of which being a function of the separation between the samples. For the dominant SR cascade we find a significant reduction in the duration and an increase of the intensity of the SR pulse relative to the case of a single two-atom SR sample.

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supporting

confidence: 54%

Interacting superradiance samples: modified intensities and timescales, and frequency shifts

Houde

Rajabi

2018

J. Phys. Commun.

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“…It consists in incorporating a saturable absorber [17] (see also Introduction and Section II.C). Technically this is AlGaInAs and GaN QW lasers [36][37][38][39]. Unfortunately all experimental studies reported in the literature do not distinguish the first emission burst from the subsequent self-pulsations, which can be modulated with a Q-switching pulse envelope.…”

Section: E the Role Of Carrier Diffusionmentioning

confidence: 99%

Low-Threshold RNGH Instabilities in Quantum Cascade Lasers

Vuković

Radovanović

Milanović

et al. 2017

IEEE J. Select. Topics Quantum Electron.

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A theoretical study on low-threshold multimode instabilities in quantum cascade lasers (QCLs) and laser diodes (LDs) is presented. Previously, low threshold Risken-Nummedal-Graham-Haken (RNGH) instabilities were reported in several experimental studies of QCLs. They were attributed so far to the combined effect of the induced grating of carrier population and of a built-in saturable absorption feature that may be present in the monolithic single-section cavity of these Fabry-Pérot lasers. Here we show that low-threshold RNGH instabilities in QCLs occur due to a combined effect of the carrier coherence grating and carrier population grating induced in the gain medium and not due to an intracavity saturable absorption. We find that QCLs with a few mm long cavity exhibit intermittent RNGH self-pulsations while regular self-pulsations are possible in short-cavity QCLs, with the cavity length of 100 µm or smaller. We examine a transient behavior to RNGH self-pulsations in short-cavity QCLs and find features that resemble cooperative superradiance. Our findings open a practical way of achieving ultra-short pulse production regimes in the mid-infrared spectral range. Applying same approach to semiconductor laser diodes (LDs) we explain the absence of RNGH selfpulsation in single-section LDs based on a quantum well gain media, while practically established method for reaching the ultrafast coherent emission regimes in LDs is to incorporate a separately contacted saturable absorber section in the LD cavity.

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“…If the initial number of excited emitters n in the Dicke state is smaller than N, then the transition time to the , / 2 N N state decreases because of the decrease in the number of terms in the sum in Eq. (7). As the number of excited emitters approaches N/2, the delay time tends to zero.…”

Section: The Dicke Model Of Supperradiancementioning

confidence: 98%

Superradiance of non-Dicke states

Nefedkin¹,

Andrianov²,

Zyablovsky³

et al. 2017

Opt. Express

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In 1954, Dicke predicted that a system of quantum emitters confined to a subwavelength volume would produce a superradiant burst. For such a burst to occur, the emitters must be in the special Dicke state with zero dipole moment. We show that a superradiant burst may also arise for non-Dicke initial states with a nonzero dipole moment. Both for Dicke and non-Dicke initial states, superradiance arises due to a decrease in the dispersion of the quantum phase of the emitter state. For non-Dicke states, the quantum phase is related to the phase of long-period envelopes which modulate the oscillations of the dipole moments. A decrease in the dispersion of the quantum phase causes a decrease in the dispersion of envelope phases that results in constructive interference of the envelopes and the superradiant burst.

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Femtosecond superradiant emission in inorganic semiconductors

Cited by 43 publications

References 77 publications

Interacting superradiance samples: modified intensities and timescales, and frequency shifts

Interacting superradiance samples: modified intensities and timescales, and frequency shifts

Low-Threshold RNGH Instabilities in Quantum Cascade Lasers

Superradiance of non-Dicke states

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