Observation of In-related collective spontaneous emission (superfluorescence) in Cd<sub>0.8</sub>Zn<sub>0.2</sub>Te:In crystal

Ding, Cairong; Li, Z. L.; Qiu, Zhiren; Becla, P.

doi:10.1063/1.4748883

Cited by 15 publications

(7 citation statements)

References 22 publications

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“…(Here the term "superfluorescence" is used instead of the more common term "SR" because in many experimental and theoretical works the latter implies that there is some preliminary coherent resonant pulse initiating a collective spontaneous emission.) Similar observations are made for the superfluorescent recombination in semiconductor samples with modest inhomogeneous broadening of active particles, which include free electrons and holes in magnetized GaAs quantum wells [21,22], degenerate electronhole gas in semiconductors [29], excitons in ZnTe crystals [10,34], and In-centers in Cd 0.8 Zn 0.2 T e crystals [13]. Based on CW pumping, the class D lasers are expected [31] to have variety of operation regimes, rich multi-mode spectra, and flexible pulse profiles, which are promising for the pulse shaping technologies and the pulse processing in "information optics" [18,39,45].…”

Section: Two Types Of Media With Extreme Spatial-spectral Density Of supporting

confidence: 62%

Superradiant Lasing and Collective Dynamics of Active Centers with Polarization Lifetime Exceeding Photon Lifetime

Kocharovskaya¹,

Kocharovsky²

2015

Springer Series in Optical Sciences

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Analytic theory, numerical simulation, and qualitative analysis of the threshold conditions, nonlinear dynamics, and spectral features of the superradiant emission and cooperative radiative behavior of a dense many-particle system in a low-Q Fabry-Perot cavity with distributed feedback of counter-propagating electromagnetic waves are given. Various systems with extreme spatial-spectral density of radiating particles as active media of superradiant lasers are discussed, including those with almost homogeneous broadening as well as strongly inhomogeneous broadening of a spectral line. In the case of experimental verification, the phenomenon of CW superradiant lasing will be promising in the information optoelectronics and condensed matter physics, in particular, for managing novel oscillators with complicated dynamical spectra and for creating unprecedented diagnostics of quantum coherent many-particle effects. Introduction. What is a class D laser?Recent experiments on pulsed superfluorescence and prospects of CW superradiant lasing in various active media (see Sect. 4.2) require a systematic analysis of the threshold conditions and the non-stationary regimes of a cooperative emission based on mode superradiance (SR). This emission takes place in the case when a photon lifetime is much shorter than a polarization lifetime of an active center. The latter situation means a low-Q cavity and a dense active medium and corresponds to the so-called class D lasers [6,28], which differ in many respects from the standard lasers of A, B, and C classes introduced by Arecchi and Harrison [3].The key difference is related to the collective dynamics of the active centers which totally alters the dynamical spectra of their population inversion and cavity Vl. V. Kocharovsky ( ) · V. V. Kocharovsky · E. R. Kocharovskaya IAP RAS, 46, Ulyanov str.,

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Section: Two Types Of Media With Extreme Spatial-spectral Density Of supporting

confidence: 62%

Superradiant Lasing and Collective Dynamics of Active Centers with Polarization Lifetime Exceeding Photon Lifetime

Kocharovskaya¹,

Kocharovsky²

2015

Springer Series in Optical Sciences

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“…Densely spaced dipoles exchange photons and radiate a pulsed light after building up a macroscopic polarization. Such dynamics have been observed in atomic gases [7,8], and impurities or carriers in solids [9][10][11][12]. The recent realization in artificial nanostructures [13,14] is a development that is promising to both fundamental many-body studies and applications.…”

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confidence: 99%

Synchronization Dynamics in a Designed Open System

et al. 2017

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We theoretically propose a unifying expression for synchronization dynamics between two-level constituents. Although synchronization phenomena require some substantial mediators, the distinct repercussions of their propagation delays remain obscure, especially in open systems. Our scheme directly incorporates the details of the constituents and mediators in an arbitrary environment. As one example, we demonstrate the synchronization dynamics of optical emitters on a dielectric microsphere. We reveal that the whispering gallery modes (WGMs) bridge the well-separated emitters and accelerate the synchronized fluorescence, known as superfluorescence. The emitters are found to overcome the significant and nonuniform retardation, and to build up their pronounced coherence by the WGMs, striking a balance between the roles of resonator and intermediary. Our work directly illustrates the dynamical aspects of many-body synchronizations and contributes to the exploration of research paradigms that consider designed open systems.

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“…superradiance typically exhibits explicit quadratic pump power dependence (I ~ N 2 ), [26][27][28] while amplified spontaneous emission could show superlinear dependence with any exponent indices, depending on the specific carrier dynamics and electronic properties of the gain media. 24,25,32 We would like to note that although a previous theoretical study 33 has predicted that in low quality cavities with large dissipation rates, superradiance with α < 2 could occur when the number of emitters is small (N < 10 6 ), we expect this not to be the case in our study due to the large quantities of molecules coupled to the cavities (N > 10 8 , estimated by assuming only a single layer of molecules covering the bottom mirror).…”

Section: Resultsmentioning

confidence: 99%

“…The most plausible mechanisms that may lead to the observed PL enhancement and accelerated spontaneous emission mainly include the cavity-induced Purcell effect, , amplified spontaneous emission, , and superradiance. − We first evaluate the influence of the Purcell effect by estimating the Purcell factor, F P , of the system, which can be derived theoretically from , where λ is the emission wavelength, n the refractive index at the position of the emitter, V the cavity mode volume, and Q the quality factor of the cavity. We extract the Q values of the cavities to be around 35 from the reflection spectrum at k ∥ = 0.…”

Section: Resultsmentioning

confidence: 99%

Microcavity-Modified Emission from Rare-Earth Ion-Based Molecular Complexes

et al. 2022

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Despite the remarkable optical properties of rare-earth ion materials, their applications as light sources and in quantum technologies are often hindered by their long lifetimes and weak emission.Leveraging the natural compatibility of rare-earth ion molecular complexes with photonic structures, here we modify their photoluminescence properties by coupling them to a flexible open Fabry-Pérot cavity. The full in situ tunability of the Fabry-Pérot cavity allows fine control over its cavity modes and the achievement of resonant coupling between the rare-earth ion emission and the cavity modes. This configuration allows us to achieve a maximum photoluminescence enhancement factor of 30 and accelerate the decay rate up to two orders of magnitude. Our pumppower dependent spectroscopic studies of the emitter-cavity system suggests that the cavitymodified emission is primarily caused by amplified spontaneous emission. These results suggest that integrating rare-earth ion molecular complexes with photonic structures could be a viable approach for the effective tuning of their optical properties. This natural compatibility, together with their versatile molecular structures and the resultant electronic states, renders rare-earth ion molecular complexes a potential alternative material platform for lighting and quantum applications.

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Observation of In-related collective spontaneous emission (superfluorescence) in Cd_0.8Zn_0.2Te:In crystal

Cited by 15 publications

References 22 publications

Superradiant Lasing and Collective Dynamics of Active Centers with Polarization Lifetime Exceeding Photon Lifetime

Superradiant Lasing and Collective Dynamics of Active Centers with Polarization Lifetime Exceeding Photon Lifetime

Synchronization Dynamics in a Designed Open System

Microcavity-Modified Emission from Rare-Earth Ion-Based Molecular Complexes

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Observation of In-related collective spontaneous emission (superfluorescence) in Cd0.8Zn0.2Te:In crystal

Cited by 15 publications

References 22 publications

Superradiant Lasing and Collective Dynamics of Active Centers with Polarization Lifetime Exceeding Photon Lifetime

Superradiant Lasing and Collective Dynamics of Active Centers with Polarization Lifetime Exceeding Photon Lifetime

Synchronization Dynamics in a Designed Open System

Microcavity-Modified Emission from Rare-Earth Ion-Based Molecular Complexes

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Observation of In-related collective spontaneous emission (superfluorescence) in Cd_0.8Zn_0.2Te:In crystal