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arXiv:1203.6132 · Physical Review A

Experimental up-conversion of images

Dong-Sheng Ding, Zhi‐Yuan Zhou, Wen Huang, Bao‐Sen Shi, Xu‐Bo Zou, Guang‐Can Guo

Published Sep 4, 2012• 23 citations
arXivHTMLPDF

Abstract

We experimentally demonstrate the up-conversion of light carrying an image from the infrared spectrum to the visible spectrum using four-wave mixing via a ladder-type configuration in an atomic vapor. The results we obtained show the high correlation between the input image and the up-converted image. We also discuss the possible influences of experimental parameters on the resolution. Our work might be useful for research in astrophysics, night-vision technology, and chemical sensing.

DOI
10.1103/physreva.86.033803

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We have demonstrated experimentally that infrared light at 1529.4 nm can be converted into the visible at 780 nm with 54% efficiency through a ladder-type atomic configuration in 85Rb. Specifically we theoretically analyze that high efficiency is due to the large nonlinear dispersion of the index of refraction from the off-resonant enhancement in a four-wave mixing (FWM) process. By using two perpendicular polarized pump fields, the coherence of two FWM processes in this configuration is verified.
The efficient wavelength conversion of images has many potential applications in optical communication, sensing, imaging, and quantum information fields. In this work, we report on a demonstration of an image transfer between light of wavelength 780 nm and light of wavelength 1530 nm by performing two sequential four-wave-mixing processes in two different hot atomic rubidium vapor cells. Furthermore, we confirm experimentally the persistence of coherence of the input light during this sequential process. Our results may be useful to the research fields mentioned above.
We present a theoretical and experimental study of IR image upconversion using two-photon resonant optical four-wave mixing in alkali metal vapors. A closed form solution for the upconversion efficiency which includes Doppler broadening of the two-photon transition and a finite bandwidth pump laser is given. Experimental results for two types of image upconverters using Cs are presented. The first upconverts 2.94 μm to 4558 Å with a power efficiency of 32 percent and1.6 \times 10^{4}resolvable spots. The second is IR tunable, but of lower efficiency and resolution. Finally, the optimized characteristics of the Cs upconverter are compared to crystal upconverters and to the requirements of various applications.
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Infrared optical measurement has a wide range of applications in industry and science, but infrared light detectors suffer from high costs and inferior performance than visible light detectors. Four-wave mixing (FWM) process allows detection in the infrared range by detecting correlated visible light. We experimentally investigate the stimulated FWM process in a hot 85Rb atomic vapor cell, in which a weak infrared signal laser at 1,530 nm induces the FWM process and is amplified and converted into a strong FWM light at 780 nm, the latter can be detected more easily. We find the optimized single- and two-photon detunings by studying the dependence of the frequency of input laser on the generated FWM light. What’s more, the power gain increases rapidly as the signal intensity decreases, which is consistent with our theoretical analysis. As a result, the power gain can reach up to 500 at a signal laser power of 0.1 μW and the number of detected photons increased by a factor of 250. Finally, we experimentally prove that our amplification process can work in a broad band in the frequency domain by exploring the response rate of our stimulated FWM process.