Super-thermal light for imaging applications

Allevi, Alessia; Cassina, Silvia; Bondani, Maria

doi:10.1515/qmetro-2017-0004

Cited by 11 publications

(6 citation statements)

References 18 publications

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“…Also, optical beams with

g^{(2)}&gt;2

are called super‐thermal light fields. [ 34,35 ] As demonstrated in Figure 1e–g, these random phase screens thermalize the initial coherent laser beam to produce a degree of second‐order coherence

g^{(2)}&gt;1

. In our experiment, we are able to preserve the coherent statistics of the initial beam by encoding phase screens with Fried's parameters r 0 that tend to infinity.…”

Section: Resultsmentioning

confidence: 79%

See 1 more Smart Citation

Engineering Super‐Poissonian Photon Statistics of Spatial Light Modes

Hong,

Miller,

León‐Montiel

et al. 2023

Laser & Photonics Reviews

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The nature of light sources is defined by the statistical fluctuations of the electromagnetic field. As such, the photon statistics of light sources are typically associated with distinct emitters. Here, the possibility of producing light beams with various photon statistics through the spatial modulation of coherent light is demonstrated. This is achieved by the sequential encoding of controllable Kolmogorov phase screens in a digital micromirror device. Interestingly, the flexibility of this scheme allows for the shaping of spatial light modes with engineered photon statistics at different spatial positions. The performance of this scheme is assessed through the photon‐number‐resolving characterization of different families of spatial light modes with engineered photon statistics. It is believed that the possibility of controlling the photon fluctuations of the light field at arbitrary spatial locations has important implications for quantum spectroscopy, sensing, and imaging.

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“…Also, optical beams with

g^{(2)}&gt;2

g^{(2)}&gt;1

. In our experiment, we are able to preserve the coherent statistics of the initial beam by encoding phase screens with Fried's parameters r 0 that tend to infinity.…”

Section: Resultsmentioning

confidence: 79%

“…Also, optical beams with g (2) > 2 are called super-thermal light fields. [34,35] As demonstrated in Figure 1e-g, these random phase screens The experiment is performed using a green laser centered at 532 nm. The initial beam is spatially cleaned and expanded using a 4-f system to match the size of the digital micro-mirror device (DMD).…”

Section: Resultsmentioning

confidence: 99%

Engineering Super‐Poissonian Photon Statistics of Spatial Light Modes

Hong,

Miller,

León‐Montiel

et al. 2023

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…where L is the crystal length. Given the link between the incoming light intensity and the second-harmonic one in Equation 10, it is possible to find a relation between the two corresponding light distributions [11,14,15]. Upon writing Equation 10as…”

Section: Classical Regimementioning

confidence: 99%

Second Harmonic Revisited: An Analytic Quantum Approach

et al. 2019

Self Cite

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We address the second-harmonic generation process in a quantum frame. Starting with a perturbative approach, we show that it is possible to achieve a number of analytic results, ranging from the up-conversion probability to the statistical properties of the generated light. In particular, the moments and the correlations of the photon-number distribution of the second-harmonic light generated by any initial state are retrieved. When possible, a comparison with the results achieved with the classical regime is successfully provided. The nonclassicality of some benchmark states is investigated by inspecting the corresponding autocorrelation function.

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“…In particular, it has been shown that light states, more correlated than the thermal ones, may lead to higher visibility, higher contrast or higher SNR 31 , 32 . Among them, it is worth mentioning that the statistics of frequency-doubled thermal states is definitely “super-thermal”, having it intensity fluctuations larger than those of a thermal field 33 , 34 . Super-thermal statistics can be also obtained by using a sequence of diffusers 35 – 39 , as some of us have experimentally demonstrated for two rotating ground-glass disks 40 by measuring the photon-number statistics in the mesoscopic intensity regime by means of photon-number-resolving detectors 41 .…”

Section: Introductionmentioning

confidence: 99%

Speckled-speckle field as a resource for imaging techniques

Cassina,

Cenedese,

Allevi

et al. 2024

Sci Rep

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Correlated states of light, both classical and quantum, can find useful applications in the implementation of several imaging techniques. Among the employed sources, pseudo-thermal states, generated by the passage of a laser beam through a diffuser, represent the standard choice. To produce light with a higher level of correlation, in this work we consider and characterize the speckled-speckle field obtained with two diffusers using both a numerical simulation and an experimental implementation. In order to discuss the potential usefulness of super-thermal light in imaging protocols, we analyze the behavior of some figures of merit, namely the contrast, the signal-to-noise ratio and the image resolution. The obtained results clarify the possible advantages offered by this kind of light, and at the same time better emphasize the reasons why it does not outperform pseudo-thermal light.

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Super-thermal light for imaging applications

Cited by 11 publications

References 18 publications

Engineering Super‐Poissonian Photon Statistics of Spatial Light Modes

Engineering Super‐Poissonian Photon Statistics of Spatial Light Modes

Second Harmonic Revisited: An Analytic Quantum Approach

Speckled-speckle field as a resource for imaging techniques

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