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Frequency doubling of a laser beam in a non-linear crystal has proven to be a very efficient way of accessing new wavelengths. Since it is a nonlinear effect, its efficiency can be improved by inserting the nonlinear medium in a resonant cavity. In this situation the ratio between the output frequency-doubled beam power and the pump power has been measured at values exceeding 80%. However, a single-mode...
In order to accurately describe optical images, the quantum nature of light must be taken into account, even when the image is formed of a great number of photons. On the one hand, the inevitable quantum fluctuations of light degrade the quality of the image, but on the other hand, the possibility of creating strong quantum correlations or even entanglement between the different points open new possibilities...
We realize image amplification in the continuous wave regime within an optical parametric oscillator bellow threshold. We show that its noise figure is better than that of a classical amplifier, demonstrating its quantum multimode operation.
The problem of extracting a given piece of information from an image with the maximum sensitivity is solved in the general case. Implementations using image intensity processing techniques and homodyne measurements are given.
We consider the problem of extracting information from an optical image. The modes responsible for the quantum noise affecting the extraction are identified, which leads to a strategy optimizing the information read out
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