Tailored first- and second-order coherence properties of quantum dot superluminescent diodes via optical feedback

Hartmann, Sébastien; Molitor, Andreas; Błażek, M.; Elsäßer, Wolfgang

doi:10.1364/ol.38.001334

Cited by 7 publications

(10 citation statements)

References 15 publications

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“…One finds that the second-order degree of coherence is inversely proportional to the number of available modes, i. e. g (2) (τ ) is affected by the characteristics of each individual QDSLD. This prediction was experimentally confirmed by an optical feedback experiment [30,31]. Further evidence on the nature of the optical quantum state came from an experiment superimposing a coherent single-mode laser beam with the broadband radiation of the QDSLD.…”

Section: Introductionmentioning

confidence: 78%

Emission spectrum of broadband quantum dot superluminescent diodes

Friedrich

Elsäßer

Walser

2020

Optics Communications

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We present a microscopic theory of the amplified spontaneous emission of a spectrally broadband quantum dot superluminescent diode within the quantum white noise limit. From this multimode quantum theory, we have the ability to obtain all orders of temporal correlation functions. In particular, we derive rate equations for the optical power densities, the level occupation of inhomogeneous ensemble of quantum dots within the diode, as well as the emitted optical spectra. As the main result, we find the external power spectrum as a convolution of the intra-diode photon spectrum with a Lorentzian response. Assuming a Gaussian light-matter coupling results in a similar shaped Gaussian output spectrum, which agrees very well with available experimental data.Keywords: quantum dot superluminescent diodes, power spectrum, ASE, amplified spontaneous emission, photon statistics, quantum dot, quantum fluctuation, Ito formalism, input-output formalism, quantum stochastic differential equations, multimode laser theory, rate equations, correlation function.

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Section: Introductionmentioning

confidence: 78%

Emission spectrum of broadband quantum dot superluminescent diodes

Friedrich

Elsäßer

Walser

2020

Optics Communications

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“…By a straightforward extension of an OFB experiment [28], we could change the number of modes, N, by narrowing the spectrum. This resulted in a coherence transition, as seen in figure 5, and agreed very well with the predictions for g (0) (2) by the PRAG state.…”

Section: Resultsmentioning

confidence: 99%

“…It turns out that one of our earlier studies [28] demonstrates the tailoring of firstand second-order coherence properties of pure QD-SLD emission by applying optical feedback (OFB) onto the semiconductor emitter (figure 4, right). The essence of this investigation was the observation of a simultaneous, continuous reduction of i) the spectral width, Δλ, from 120 nm to subnanometer values, and ii) the second-order coherence degree, g (0) exp (2) , from 1.85 to 1.0, for the light emitted by the QD-SLD (InAs/InGaAs, dot-in-well structure) under increased OFB.…”

Section: Tuning Mode Numbers Via Optical Feedbackmentioning

confidence: 94%

“…The continuous transition of the second-order coherence degree, g (0) exp (2) , taken from [28], is now depicted in figure 5 as a function of the number of emitted modes N, calculated from the measured optical spectra, p s i . Note that it is essential to exclude nonrelevant spectral contributions, which can falsify the statistics of p s i ; thus we choose to take into account only those peaks that are no more than 13 dB below the maximum power value, p s max .…”

Section: Tuning Mode Numbers Via Optical Feedbackmentioning

confidence: 99%

“…Since then, the second-order correlations, τ g ( ) (2) , of broadband light states can be globally resolved, in the sense that all contributing spectral components are simultaneously detected. A number of investigations have exploited this elegant TPA-detection technique so far, referring to characterizations and applications of broadband semiconductor emitters regarding their photon statistical characteristics [28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tailored quantum statistics from broadband states of light

Hartmann¹,

Friedrich²,

Molitor³

et al. 2015

New J. Phys.

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We analyze the statistics of photons originating from amplified spontaneous emission generated by a quantum dot superluminescent diode. Experimentally detectable emission properties are taken into account by parametrizing the corresponding quantum state as a multimode phase-randomized Gaussian density operator. The validity of this model is proven in two subsequent experiments using fast two-photon-absorption detection observing second-order equal-time and second-order fully time-resolved intensity correlations on femtosecond timescales. In the first experiment, we study the photon statistics when the number of contributing longitudinal modes is systematically reduced by applying well-controlled optical feedback. In a second experiment, we add coherent light from a single-mode laser diode to quantum dot superluminescent diode broadband radiation. Tuning the power ratio, we realize tailored second-order correlations ranging from Gaussian to Poissonian statistics. Both experiments are very well matched by theory, thus giving first insights into the quantum properties of radiation from quantum dot superluminescent diodes.

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A novel semiconductor-based, fully incoherent amplified spontaneous emission light source for ghost imaging

Hartmann

Elsäßer

2017

Sci Rep

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Initially, ghost imaging (GI) was demonstrated with entangled light from parametric down conversion. Later, classical light sources were introduced with the development of thermal light GI concepts. State-of-the-art classical GI light sources rely either on complex combinations of coherent light with spatially randomizing optical elements or on incoherent lamps with monochromating optics, however suffering strong losses of efficiency and directionality. Here, a broad-area superluminescent diode is proposed as a new light source for classical ghost imaging. The coherence behavior of this spectrally broadband emitting opto-electronic light source is investigated in detail. An interferometric two-photon detection technique is exploited in order to resolve the ultra-short correlation timescales. We thereby quantify the coherence time, the photon statistics as well as the number of spatial modes unveiling a complete incoherent light behavior. With a one-dimensional proof-of-principle GI experiment, we introduce these compact emitters to the field which could be beneficial for high-speed GI systems as well as for long range GI sensing in future applications.

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Tailored first- and second-order coherence properties of quantum dot superluminescent diodes via optical feedback

Cited by 7 publications

References 15 publications

Emission spectrum of broadband quantum dot superluminescent diodes

Emission spectrum of broadband quantum dot superluminescent diodes

Tailored quantum statistics from broadband states of light

A novel semiconductor-based, fully incoherent amplified spontaneous emission light source for ghost imaging

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