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Research Article Pages 40-49
Abstract: In the last few years, the bismides III-V, in particular,
GaAsBi has aroused a great attention in the aim of the realization
of optoelectronic devices field such as infrared
emitters, infrared detectors, laser diodes, solar cells and
spintronics. Indeed, the incorporation of few percents
of Bi into conventional III-V semiconductors results
in a remarkable lift of valence band, leading to a serious
decrease of the band gap due to the valence band anti-
crossing effects and thermal stability
RESEARCH ANALYST Pages 36-39
Abstract: The possible existence of superluminal particles, which are forbidden by well-known laws of physics, has been studied by many physicists. Some of them confirmed the superluminal speed by their experiments. By using Klein-Gordon wave equation for photons, the author shows that the photon travels at a superluminal speed in an electromagnetic near field of the source and they reduce to the speed of light as they propagate into the far field.
Review Article Pages 31-35
Abstract: The new multi-pass configuration of side-pumped Nd:YAG solar laser for enhancement of conversion efficiency is studied by computer simulation of the laser system. The active medium in the form of a slab providing effective heat dissipation during side pumping by concentrated solar radiation at the focus of a parabolic concentrator with a diameter of 1 m is considered. It is shown that multi-pass configuration doubles the output laser power.
Review Article Pages 26-30
Abstract: Simple approach for achieving high efficiency of solar pumped laser performance on the base of alexandrite active medium is proposed. Performance analyses have been conducted by simulating solar pumped alexandrite laser with core-doped parabolic shape composite active medium, using ray-tracing Monte-Carlo techniques. It is shown that the overall efficiency of alexandrite laser can be about 15% which is much higher than that of existing solar pumped lasers.
Original Article Pages 21-25
Abstract: As soon as pairs of down-converted frequency photons are generated in a nonlinear crystal, the photons interact, individually, with the linear susceptibility formed by the electric dipoles in any dielectric medium. As a result, the quantum Rayleigh conversion of photons absorbs one photon and emits spontaneously another photon in a random direction and with a random state of polarization. However, the statistical results of the expectation values associated with entangled qubits of polarized photons are exactly reproduced with independent and individual qubits. The possibility of quantum non-locality properties being linked to entangled photons over long distances can easily be ruled out because of the immediate physical annihilation of the entangled photons propagating in a dielectric medium.
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