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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 setup.Signal (blue) and idler (red) beams are directed onto the SLM. As can be seen in the image, each of the twin photons is incident on one side of the SLM. Acronyms are defined in the text.
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f3: Experimental setup.Signal (blue) and idler (red) beams are directed onto the SLM. As can be seen in the image, each of the twin photons is incident on one side of the SLM. Acronyms are defined in the text.

Mentions: Figure 3 shows a sketch of the experimental setup. Horizontally polarized frequency-degenerate twin photons at 650 nm are generated by pumping a non-linear BBO (β-Barium Borate) crystal with a He-Cd laser operating at λ = 325 nm. The photons are directed onto a single SLM using mirrors and lenses. The SLM is the Pluto reflective phase-modulation-only model fabricated by Holoeye, with resolution 1920 × 1080 pixels and 8.0-µm pixel pitch. A half-wave plate is used right before the SLM to prepare the polarization state of the photons to /+〉. At the detection stage, each beam goes through another wave plate and a polarizing beam splitter to select the photons that reflected off of the intended region of the SLM. The detectors are single-photon avalanche photodiodes (APD) with large detection aperture. Lenses (focal lengths 70 cm and 15 cm) are used to map the tranverse position of the down-converted beams onto the SLM. For the measurements, horizontal phase slits are scanned vertically on each half of the SLM, corresponding to each beam. The total scan region for each photon is thus 1080 pixels.


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 setup.Signal (blue) and idler (red) beams are directed onto the SLM. As can be seen in the image, each of the twin photons is incident on one side of the SLM. Acronyms are defined in the text.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Experimental setup.Signal (blue) and idler (red) beams are directed onto the SLM. As can be seen in the image, each of the twin photons is incident on one side of the SLM. Acronyms are defined in the text.
Mentions: Figure 3 shows a sketch of the experimental setup. Horizontally polarized frequency-degenerate twin photons at 650 nm are generated by pumping a non-linear BBO (β-Barium Borate) crystal with a He-Cd laser operating at λ = 325 nm. The photons are directed onto a single SLM using mirrors and lenses. The SLM is the Pluto reflective phase-modulation-only model fabricated by Holoeye, with resolution 1920 × 1080 pixels and 8.0-µm pixel pitch. A half-wave plate is used right before the SLM to prepare the polarization state of the photons to /+〉. At the detection stage, each beam goes through another wave plate and a polarizing beam splitter to select the photons that reflected off of the intended region of the SLM. The detectors are single-photon avalanche photodiodes (APD) with large detection aperture. Lenses (focal lengths 70 cm and 15 cm) are used to map the tranverse position of the down-converted beams onto the SLM. For the measurements, horizontal phase slits are scanned vertically on each half of the SLM, corresponding to each beam. The total scan region for each photon is thus 1080 pixels.

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