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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Patent•
01 Dec 1992
TL;DR: In this article, the optical elements include a dichroic mirror, a non-linear crystal, and right angle prisms, and the beams are reflected by one of the prisms back through the nonlinear crystal so that walkoff is cancelled.
Abstract: An Optical Parametric Oscillator (OPO) includes optical elements located and oriented so a pump beam is generating an idler beam and a signal beam while all of these beams propagate in common directions at any given time as they move through the OPO. In one form of the invention, the optical elements include a dichroic mirror, a non-linear crystal, and right angle prisms. The beams are reflected by one of the right angle prisms back through the non-linear crystal so that walkoff is cancelled.
28 citations
TL;DR: In this paper, the relative phase between the signal beam and the control beam of a single-layered metasurface was dynamically manipulated to control the Snell's law.
Abstract: Coherent control of the reflection and refraction in semicontinuous metasurfaces is realized. Both the reflection and refraction efficiency of a single-layered metasurface can be greatly improved with this method. By controlling the relative phase between the signal beam and the control beam, the Snell's law can be dynamically manipulated. This method may open possibilities to the practical application of metasurfaces.
28 citations
Patent•
28 Oct 1994
TL;DR: In this article, the authors proposed a method to prevent the occurrence of an optical surge when becoming a non- signal state without bringing on a loss of a signal beam and without increasing an increase index by monitoring two optical outputs with a photodetector and controlling excitation light with a light intensity ratio of light of both wavelengths.
Abstract: PURPOSE: To prevent the occurrence of an optical surge when becoming a non- signal state without bringing on a loss of a signal beam and without increasing an increase index by monitoring two optical outputs with a photodetector and controlling excitation light with a light intensity ratio of light of both wavelengths. CONSTITUTION: An optical band-pass filter 10 transmits selectively through light of a wavelength λ1, and the optical band-pass filter 11 transmits selectively through the light of the wavelength λ2. At this time, the wavelength λ2 whose wavelength is selected to one in the vicinity of the wavelength λ1. The optical band-pass filter 11 is provided with a narrow wavelength band characteristic, and cuts off the light of the wavelength of λ1. The light intensity ratio of respective wavelengths λ1, λ2 light received by the photodetectors 12, 13 is changed according to the change of the input level of the input signal of the wavelength λ1, and the ratio is changed large under the non-signal state. Thus, when the light intensity ratio of respective wavelengths λ1, λ2 detected by the photodetectors 12, 13 becomes a prescribed reference value or below, the occurrence of the optical surge is suppressed by performing no amplification.
28 citations
Patent•
20 Sep 2010TL;DR: In this paper, an optical phase processing system for a scattering medium was proposed, where a first beam has a direction and a wavefront and the first beam is configured to enter a holographic recording medium.
Abstract: An optical phase processing system for a scattering medium. A first beam has a direction and a wavefront and the first beam is configured to enter a holographic recording medium. A scattering medium is illuminated by a signal beam generating at least one scattered beam. An interference pattern is recorded from the at least one scattered beam and the first beam. A second beam is generated in a direction opposite to the direction of the first beam, the second beam having a wavefront and a phase substantially opposite to a phase of the wavefront of the first beam, and the second beam is configured to enter the holographic recording medium. The second beam and the interference pattern interact to generate at least one reconstructed beam having a phase substantially opposite to a phase of the at least one scattered beam, and the at least one reconstructed beam is configured to be viewable through the scattering medium.
28 citations
TL;DR: In this article, phase conjugation that is due to degenerate forward four-wave mixing was studied both theoretically and experimentally and the numerical solution of the nonstationary problem was presented, revealing the transient oscillations of the PC-beam intensity with maxima many times exceeding the saturation value.
Abstract: Phase conjugation (PC) that is due to degenerate forward four-wave mixing is studied both theoretically and experimentally. Similarly to backward four-wave mixing, the limiting efficiency of this process corresponds to the total energy transfer from each pump wave into the signal and conjugate waves, although in this case the Yariv oscillations do not occur. The numerical solution of the nonstationary problem is presented, revealing the transient oscillations of the PC-beam intensity with maxima many times exceeding the saturation value. PC of Q-switched and free-oscillating solid-state laser radiation is obtained by using the thermal nonlinearity of absorbing solutions. PC of cw laser radiation is obtained in a LiNbO3 crystal, the PC-beam intensity being six times larger than the initial intensity of the signal beam. The self-compensation of nonlinear phase distortions of the recording medium is demonstrated.
28 citations