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Measuring spatial correlations of photon pairs by automated raster scanning with spatial light modulators.

Paul EC, Hor-Meyll M, Ribeiro PH, Walborn SP - Sci Rep (2014)

Bottom Line: We demonstrate the use of a phase-only spatial light modulator for the measurement of transverse spatial distributions of coincidence counts between twin photon beams, in a fully automated fashion.This is accomplished by means of the polarization dependence of the modulator, which allows the conversion of a phase pattern into an amplitude pattern.We also present a correction procedure, that accounts for unwanted coincidence counts due to polarization decoherence effects.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972, Brazil.

ABSTRACT
We demonstrate the use of a phase-only spatial light modulator for the measurement of transverse spatial distributions of coincidence counts between twin photon beams, in a fully automated fashion. This is accomplished by means of the polarization dependence of the modulator, which allows the conversion of a phase pattern into an amplitude pattern. We also present a correction procedure, that accounts for unwanted coincidence counts due to polarization decoherence effects.

No MeSH data available.


Related in: MedlinePlus

Experimental results when the detectors are scanned in the transverse plane.a) The marginal coincidence distribution Cs(xs). b) The marginal coincidence distribution C−(xs − xi).
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f4: Experimental results when the detectors are scanned in the transverse plane.a) The marginal coincidence distribution Cs(xs). b) The marginal coincidence distribution C−(xs − xi).

Mentions: In order to characterize the spatial distribution of the coincidence counts in the absence of the SLM, we first performed the traditional procedure of scanning the detectors in the transverse plane and registering coincidence counts as a function of the detector position x. In these measurements the scanning detectors were equipped with a 20-µm slit aperture and scanned in the vertical direction. The polarization of the photons was set to the vertical direction, so that the SLM had no effect on the spatial distribution. Figure 4a) shows results when detector Ds is scanned and detector Di is completely open (area-integrating). Fig. 4b) shows results when the detectors are scanned in opposite directions, giving the coincidence distribution as a function of xs − xi. The data of both figures fit well to gaussian functions. We also see that the tails of the gaussians go to zero, indicating low background counts outside the coincidence region.


Measuring spatial correlations of photon pairs by automated raster scanning with spatial light modulators.

Paul EC, Hor-Meyll M, Ribeiro PH, Walborn SP - Sci Rep (2014)

Experimental results when the detectors are scanned in the transverse plane.a) The marginal coincidence distribution Cs(xs). b) The marginal coincidence distribution C−(xs − xi).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4061558&req=5

f4: Experimental results when the detectors are scanned in the transverse plane.a) The marginal coincidence distribution Cs(xs). b) The marginal coincidence distribution C−(xs − xi).
Mentions: In order to characterize the spatial distribution of the coincidence counts in the absence of the SLM, we first performed the traditional procedure of scanning the detectors in the transverse plane and registering coincidence counts as a function of the detector position x. In these measurements the scanning detectors were equipped with a 20-µm slit aperture and scanned in the vertical direction. The polarization of the photons was set to the vertical direction, so that the SLM had no effect on the spatial distribution. Figure 4a) shows results when detector Ds is scanned and detector Di is completely open (area-integrating). Fig. 4b) shows results when the detectors are scanned in opposite directions, giving the coincidence distribution as a function of xs − xi. The data of both figures fit well to gaussian functions. We also see that the tails of the gaussians go to zero, indicating low background counts outside the coincidence region.

Bottom Line: We demonstrate the use of a phase-only spatial light modulator for the measurement of transverse spatial distributions of coincidence counts between twin photon beams, in a fully automated fashion.This is accomplished by means of the polarization dependence of the modulator, which allows the conversion of a phase pattern into an amplitude pattern.We also present a correction procedure, that accounts for unwanted coincidence counts due to polarization decoherence effects.

View Article: PubMed Central - PubMed

Affiliation: Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972, Brazil.

ABSTRACT
We demonstrate the use of a phase-only spatial light modulator for the measurement of transverse spatial distributions of coincidence counts between twin photon beams, in a fully automated fashion. This is accomplished by means of the polarization dependence of the modulator, which allows the conversion of a phase pattern into an amplitude pattern. We also present a correction procedure, that accounts for unwanted coincidence counts due to polarization decoherence effects.

No MeSH data available.


Related in: MedlinePlus