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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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X-ray parametric down-conversion in the Langevin regime.

S Shwartz¹, R N Coffee, J M Feldkamp

¹Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305, USA. shwartz@stanford.edu

Physical Review Letters

|October 4, 2012

Summary

This summary is machine-generated.

We improved the signal-to-noise ratio for down-converted X-ray photons using a transmission geometry. This experimental approach aligns with theoretical predictions, advancing X-ray photon research.

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Area of Science:

Quantum optics
X-ray physics

Background:

Parametric down-conversion at X-ray wavelengths is affected by photoionization losses.
Theoretical descriptions typically require a Langevin approach due to these losses.

Purpose of the Study:

To experimentally and theoretically investigate the coincidence count rate of down-converted X-ray photons.
To improve the signal-to-noise ratio in X-ray photon coincidence counting.

Main Methods:

Utilized a transmission (Laue) geometry for X-ray photon detection.
Employed theoretical modeling based on the Langevin approach.
Measured coincidence count rates for down-converted X-ray photons.

Main Results:

Achieved a 12.5-fold improvement in signal-to-noise ratio compared to previous Bragg geometry experiments.
Demonstrated strong agreement between experimental measurements and theoretical predictions.
Validated the effectiveness of the Laue geometry for X-ray parametric down-conversion.

Conclusions:

The Laue geometry offers a significant advantage for studying X-ray parametric down-conversion.
Experimental results confirm the validity of the Langevin approach for describing these processes.
This work enhances the capability for precise measurements of X-ray photon correlations.