Ghost imaging experiment with sunlight compared to laboratory experiment with thermal light

Karmakar, Sanjit; Meyers, Ronald E.; Shih, Yanhua

doi:10.1117/12.929157

Cited by 27 publications

(15 citation statements)

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“…bunching from blackbody light sources has been extremely difficult, with only recent breakthroughs using two-photon absorption in semiconductors (Boitier et al 2009), and in ghost imaging research using a narrowband Faraday anomalous dispersion optical filter (Karmakar et al 2012;Wu et al 2014).…”

Section: The Problemmentioning

confidence: 99%

Measuring Temporal Photon Bunching in Blackbody Radiation

Tan

Yeo

Poh

et al. 2014

ApJ

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Light from thermal black body radiators such as stars exhibits photon bunching behaviour at sufficiently short time-scales. However, with available detector bandwidths, this bunching signal is difficult to be directly used for intensity interferometry with sufficient statistics in astronomy. Here we present an experimental technique to increase the photon bunching signal in blackbody radiation via spectral filtering of the light source. Our measurements reveal strong temporal photon bunching in light from blackbody radiation, including the Sun. Such filtering techniques may revive the interest in intensity interferometry as a tool in astronomy.

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Section: The Problemmentioning

confidence: 99%

Measuring Temporal Photon Bunching in Blackbody Radiation

Tan

Yeo

Poh

et al. 2014

ApJ

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“…For blackbody type sources, a time resolution of about 10 −14 s is necessary [12]. Such measurements have only been achieved with two-photon absorption techniques in semiconductors [13], and in ghost imaging experiments [14]. Those are incompatible with astrophysics applications in terms of light intensity requirements.…”

Section: Introductionmentioning

confidence: 99%

Temporal intensity correlation of light scattered by a hot atomic vapor

et al. 2016

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We present temporal intensity correlation measurements of light scattered by a hot atomic vapor. Clear evidence of photon bunching is shown at very short time-scales (nanoseconds) imposed by the Doppler broadening of the hot vapor. Moreover, we demonstrate that relevant information about the scattering process, such as the ratio of single to multiple scattering, can be deduced from the measured intensity correlation function. These measurements confirm the interest of temporal intensity correlation to access non-trivial spectral features, with potential applications in astrophysics.

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“…In applications such as imaging by coincidence [8,14] the restricted dynamic range can be a severe limitation. In some very interesting situations such as coincidence imaging of a scene under sunlight illumination [14,15] changing flux due to environmental conditions is to be expected. In other applications such as coincidence based microscopy [8], changing flux can arise from bright regions.…”

Section: Introductionmentioning

confidence: 99%

Correcting for accidental correlations in saturated avalanche photodiodes

Grieve¹,

Chandrasekara²,

Tang³

et al. 2016

Opt. Express

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In this paper we present a general method for estimating rates of accidental coincidence between a pair of single photon detectors operated within their saturation regimes. By folding the effects of recovery time of both detectors and the detection circuit into an "effective duty cycle" we are able to accomodate complex recovery behaviour at high event rates. As an example, we provide a detailed high-level model for the behaviour of passively quenched avalanche photodiodes, and demonstrate effective background subtraction at rates commonly associated with detector saturation. We show that by post-processing using the updated model, we observe an improvement in polarization correlation visibility from 88.7% to 96.9% in our experimental dataset. This technique will be useful in improving the signal-to-noise ratio in applications which depend on coincidence measurements, especially in situations where rapid changes in flux may cause detector saturation.

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Ghost imaging experiment with sunlight compared to laboratory experiment with thermal light

Cited by 27 publications

References 0 publications

Measuring Temporal Photon Bunching in Blackbody Radiation

Measuring Temporal Photon Bunching in Blackbody Radiation

Temporal intensity correlation of light scattered by a hot atomic vapor

Correcting for accidental correlations in saturated avalanche photodiodes

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