Topic
Phase conjugation
About: Phase conjugation is a research topic. Over the lifetime, 3694 publications have been published within this topic receiving 49099 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the authors observed stimulated extraordinary-ordinary wave scattering and cross-polarized self-starting optical phase conjugation effects in a nematic liquid-crystal film.
Abstract: We have observed stimulated extraordinary-ordinary wave scattering and cross-polarized self-starting optical phase conjugation effects in a nematic liquid-crystal film. The basic mechanism involved is the nonresonant laser-induced nematic crystal axis reorientation. These processes require low optical power and are characterized by millisecond response speed.
30 citations
TL;DR: In this paper, the authors reported the first demonstration of atmospheric compensation at extended ranges by stimulated Brillouin-scattering phase conjugation at a 2.5m height above ground.
Abstract: We report the first demonstration to our knowledge of atmospheric compensation at extended ranges by stimulated Brillouin-scattering phase conjugation. With a field-of-view aperture product of 175 mm mrad, we studied horizontal ranges up to 6 km at a 2.5-m height above ground, with the refractive-index structure parameter Cn2 as large as 10−13 m−2/3. Compensation was achieved at all ranges, consistent with the turbulence-resolution capability of the 10-cm system aperture. The system was driven by frequency-doubled Nd:YAG lasers operating with ~10-ns pulses that were Raman shifted in gaseous hydrogen to the 683-nm operating wavelength. Raman amplification overcame as much as 85 dB of range and internal losses.
30 citations
TL;DR: Both the theoretical and measured results of phase conjugation and retro-directive performance are shown in good agreement.
Abstract: In this paper, a novel phase conjugation circuit and its application to retro-directive antennas are presented. The phase conjugation circuit uses a balanced circuit structure with subharmonically injection locked self-oscillating mixers oscillating at /spl omega/. In the operation, an input signal at /spl omega//2 is converted to its conjugated signal with no external source required for LO signal pumping, and the output signal frequency is locked at the same frequency of the input signal. The developed phase conjugation circuit is implemented with active antennas to become a retro-directive antenna array. Both the theoretical and measured results of phase conjugation and retro-directive performance are shown in good agreement.
30 citations
TL;DR: The mechanism responsible for the large nonlinearity is the thermally induced index change in liquid crystals near the transition temperature as discussed by the authors, and the influence of the therm conductivity of the windows on the temperature distribution inside the liquid crystal cell is also considered.
30 citations
TL;DR: In this article, the effect of optical phase conjugation on Gordon-Haus jitter in long-distance soliton communication systems is considered, and a post-transmission line compensation scheme based on optical phase convolutions and soliton-supported dispersion compensation is proposed.
Abstract: The effect of optical phase conjugation on Gordon-Haus jitter in long-distance soliton communication systems is considered. In-line optical phase conjugation at an optimal point two-thirds of the way down the system reduces the rms jitter by a factor of three. A post-transmission-line compensation scheme based on optical phase conjugation and soliton-supported dispersion compensation reduces the rms jitter by a factor of two. >
29 citations