Topic
Signal beam
About: Signal beam is a research topic. Over the lifetime, 1881 publications have been published within this topic receiving 20717 citations.
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TL;DR: A method of reconstructing positive and negative images from Fourier holograms recorded without the dc components is demonstrated by use of a coaxial holographic storage system, potentially contributing to increasing the number of multiplexed holograms.
Abstract: A method of reconstructing positive and negative images from Fourier holograms recorded without the dc components is demonstrated by use of a coaxial holographic storage system. Reconstructed images are obtained by adding a phase-modulated dc component of the signal beam on reading. Contrast reversal of the reconstructed images can be achieved by reversing the readout reference pattern. This method can realize not only optical noise reduction but also less consumption of the dynamic range of the recording medium, potentially contributing to increasing the number of multiplexed holograms.
9 citations
TL;DR: In this paper, the authors present theoretical estimates for a low-loss, all-optical transistor using a microresonator device whose fields interact evanescently with rubidium vapor, and show that a weak control beam with less than single-photon intensities can switch a much stronger signal beam with switching contrast of greater than 25dB and loss less than 0.5dB.
Abstract: We present theoretical estimates for a low-loss, all-optical transistor using a microresonator device whose fields interact evanescently with rubidium vapor. We use a four-level, electromagnetically induced absorption scheme to couple the light fields of the transistor. We show results indicating that a weak control beam with less than single-photon intensities can switch a much stronger signal beam with switching contrast of greater than 25 dB and loss less than 0.5 dB.
9 citations
TL;DR: In this article, the authors studied the effect of noncollinear mismatched parametric interaction in a quadratic medium on the total reflection of a weak signal beam from a high-power reference beam.
Abstract: The phenomenon of the total reflection of a weak signal beam from a high-power reference beam due to noncollinear mismatched parametric interaction in a quadratic medium is demonstrated. In a planar geometry the conditions of the signal beam reflection from the optical inhomogeneity induced by the reference beam are found. The analytical expression for the critical value of the signal beam tilt is obtained, and it is shown that total reflection occurs if the initial tilt is less than the critical value. The influence of the walk-off and the reference beam focusing on interaction dynamics are discussed. It is shown that in a bulk medium the beam reflection turns into scattering by an induced inhomogeneity. If reflection conditions are fulfilled, the cylindrical reference beam acts as a convex mirror and lunate distortions of the reflected beam profile occur.
9 citations
TL;DR: In this paper, a fiber optic heterodyne vibrometer configuration based on the use of birefringent optical fibre components is demonstrated with a laser diode at 833 nm with a minimum detectable phase change of obtained at 5 kHz.
Abstract: A fibre optic heterodyne vibrometer configuration based on the use of birefringent optical fibre components is demonstrated. The heterodyne processing is moved to the receiving section of the interferometer, reducing the optomechanical stability requirements of the system and enabling optimization of the reference to signal beam ratio intensity. The instrument can be configured to have minimum down lead sensitivity. The technique was demonstrated with a laser diode at 833 nm with a minimum detectable phase change of obtained at 5 kHz.
9 citations
TL;DR: In this paper, the phase-conjugate reflectivity obtainable by degenerate four-wave mixing in silicon at a 1.06 μm including free-carrier absorption is calculated.
Abstract: The phase-conjugate reflectivity obtainable by degenerate four-wave mixing in silicon at a 1.06 μm is calculated including free-carrier absorption. A maximum reflectivity of more than 100% is possible. The dependence of the reflectivity on the signal and pump energy densities up to 70 mJ/cm2 is measured and found to agree with theory. The wave-front-correction property of DFWM is demonstrated with a lens in the signal beam.
9 citations