84 research outputs found
Radiolytic processes in mixtures of cyclobutane and perfluorocyclobutane in the gas phase
Mechanism and kinetics of radiolytically initiated cyclohexyl radical addition to cis- and trans-1,2-dichloroethylene and of the subsequent chlorine atom elimination reaction
Noise reduction in photorefractive image amplifiers and applications
We propose and experimentally demonstrate two original methods for
suppressing the beam fanning noise of photorefractive amplifiers. The first
one involves two wave mixing in a slowly rotating crystal, while the second
requires to tilt the crystal with respect to the recording beams. This method
applies to materials which exhibit a sharp resonance of the gain versus the
pump-probe beam angle. With both methods a large improvement of the ratio
is achieved and virtually noise free image amplifiers are demonstrated.
In BiSiO, subpicowatt optical signals are detected and amplified.
By using combinations of LiNbO/BiSiO, as storage and amplification
crystals respectively a long term readout (more than 20 hours) of a photorefractive
memory is achieved
Photonics: From European support to industrial technology leadership
Photonics support in the European programmes dates back to the early 90s, though the “Telematics” and “Esprit” initiatives (1983 to 1998) primarily focused on the then emerging field of optical telecommunication, fibre optics, optoelectronic, detectors and III-Vs and semiconductor lasers
Edge enhancement by use of moving gratings in a bismuth silicon oxide crystal and its application to optical correlation
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