Coherence time measurements using a single detector with variable time resolution

Aßmann, Marc; Bayer, М.

doi:10.1364/ol.37.002811

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…By varying the detector response time (or bin size) around the period of expected coherence time one can estimate the coherence time and g (2) (0) [153]. g (2) (0) < 1 is a signature of non-classical (quantum nature) of the light [22, Fig.…”

Section: Squeezed States Of Ultra-weak Photon Emission ?mentioning

confidence: 99%

“…In [152], authors introduced second order correlation function at zero time lag g (2) (τ = 0) to estimate non-classicality of UPE. By varying the detector response time (or bin size) around the period of expected coherence time one can estimate the coherence time and g (2) (0) [153]. g (2) (0) < 1 is a signature of non-classical (quantum nature) of the light [22, Fig.…”

Section: Squeezed States Of Ultra-weak Photon Emission ?mentioning

confidence: 99%

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Biophotons, coherence and photocount statistics: A critical review

Cifra

Brouder

Nerudová

et al. 2015

Journal of Luminescence

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Biological samples continuously emit ultra-weak photon emission (UPE, or "biophotons") which stems from electronic excited states generated chemically during oxidative metabolism and stress. Thus, UPE can potentially serve as a method for noninvasive diagnostics of oxidative processes or, if discovered, also of other processes capable of electron excitation. While the fundamental generating mechanisms of UPE are fairly elucidated together with their approximate ranges of intensities and spectra, statistical properties of UPE is still a highly challenging topic. Here we review claims about nontrivial statistical properties of UPE, such as coherence and squeezed states of light. After introduction to the necessary theory, we categorize the experimental works of all authors to those with solid, conventional interpretation and those with unconventional and even speculative interpretation. The conclusion of our review is twofold; while the phenomenon of UPE from biological systems can be considered experimentally well established, no reliable evidence for the coherence or nonclassicality of UPE was actually achieved up to now. Furthermore, we propose perspective avenues in the research of statistical properties of biological UPE.

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Section: Squeezed States Of Ultra-weak Photon Emission ?mentioning

confidence: 99%

Section: Squeezed States Of Ultra-weak Photon Emission ?mentioning

confidence: 99%

Biophotons, coherence and photocount statistics: A critical review

Cifra

Brouder

Nerudová

et al. 2015

Journal of Luminescence

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“…In bimodal lasers, the gain competition [21,22], dissipative mode coupling [23], temporal mode-switching [24], intermode kinetics [25], external feedback [26], mode coupling [27,28] and a short-pumppulse-induced quench [29,30] can lead to superthermal photon autocorrelations. Besides these quantum effects, which are known to produce superthermal photon bunching, there are also pseudo thermal light sources [31][32][33], which emit intense light with g (2) = 2 or even exceeding this value [34,35].…”

Section: Introductionmentioning

confidence: 99%

Superthermal photon bunching in terms of simple probability distributions

et al. 2018

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We analyze the second-order photon autocorrelation function g (2) with respect to the photon probability distribution and discuss the generic features of a distribution that result in superthermal photon bunching (g (2) > 2). Superthermal photon bunching has been reported for a number of optical microcavity systems that exhibit processes like superradiance or mode competition. We show that a superthermal photon number distribution cannot be constructed from the principle of maximum entropy, if only the intensity and the second-order autocorrelation are given. However, for bimodal systems an unbiased superthermal distribution can be constructed from second-order correlations and the intensities alone. Our findings suggest modeling superthermal single-mode distributions by a mixture of a thermal and a lasing like state and thus reveal a generic mechanism in the photon probability distribution responsible for creating superthermal photon bunching. We relate our general considerations to a physical system, a (single-emitter) bimodal laser, and show that its statistics can be approximated and understood within our proposed model. Furthermore the excellent agreement of the statistics of the bimodal laser and our model reveal that the bimodal laser is an ideal source of bunched photons, in the sense that it can generate statistics that contain no other features but the superthermal bunching. arXiv:1802.06417v2 [physics.optics]

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“…The active medium consists of a single layer of self-assembled AlGaInAs quantum dots with a density of ≈ 6 × 10 9 cm −2 . The sample was mounted on the cold finger of a helium-flow cryostat and kept at a temperature of 10 K. For nonresonant optical excitation, we use a Martienssen lamp [21] consisting of laser light provided by a Ti-sapphire laser emitting pulses with a duration of ≈ 100 fs at a repetition rate of 75.39 MHz and a wavelength of 790 nm scattered by a rotating ground glass disk as our pseudothermal light source [22]. The laser light is focused onto the ground glass disk using a 50 mm focal length lens.…”

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confidence: 99%

Photon-Statistics Excitation Spectroscopy of a Quantum-Dot Micropillar Laser

et al. 2015

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We introduce photon-statistics excitation spectroscopy and exemplarily apply it to a quantum-dot micropillar laser. Both the intensity and the photon number statistics of the emission from the micropillar show a strong dependence on the photon statistics of the light used for excitation of the sample. The results under coherent and pseudothermal excitation reveal that a description of the laser properties in terms of mean input photon numbers is not sufficient. It is demonstrated that the micropillar acts as a superthermal light source when operated close to its threshold. Possible applications for important spectroscopic techniques are discussed.

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Coherence time measurements using a single detector with variable time resolution

Cited by 6 publications

References 16 publications

Biophotons, coherence and photocount statistics: A critical review

Biophotons, coherence and photocount statistics: A critical review

Superthermal photon bunching in terms of simple probability distributions

Photon-Statistics Excitation Spectroscopy of a Quantum-Dot Micropillar Laser

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