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Phase conjugation

About: Phase conjugation is a research topic. Over the lifetime, 3694 publications have been published within this topic receiving 49099 citations.


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Journal ArticleDOI
TL;DR: Two different realizations of time-reversal experiments of ultrafast waveforms are carried out in real time by use of four-wave mixing arrangements of spectrally decomposed waves and the first method is based on phase conjugation of the waveform's spectrum and achieves time reversal of real amplitude waveforms.
Abstract: Two different realizations of time-reversal experiments of ultrafast waveforms are carried out in real time by use of four-wave mixing arrangements of spectrally decomposed waves. The first, conventional, method is based on phase conjugation of the waveform’s spectrum and achieves time reversal of real amplitude waveforms. The second arrangement of the spectrally decomposed waves spatially inverts the waveform’s spectrum with respect to the optical axis of the processor and achieves true time reversal for complex-amplitude ultrafast waveforms. We compare and contrast these two real-time techniques.

36 citations

Journal ArticleDOI
TL;DR: A new RADAR system able to perform Phase Conjugation experiments over the ultrawideband (2{4)GHz) and the excellent agreement between measured and theoretical results validates the potential of the system.
Abstract: We present a new RADAR system able to perform Phase Conjugation experiments over the ultrawideband (2{4)GHz. The system is equipped with a transmit/receive linear array made of eight antennas connected to a 2-port Vector Network Analyzer through eight independent couples of digitally-controlled RF attenuators and phase shifters. Thus, each channel can selectively transmit or receive and can as well attenuate and phase shift the RF signal. For each frequency, either the Phase Conjugation or the Decomposition of the Time Reversal Operator (DORT) is applied to the received signal and the appropriate amplitude and phase law is coded into the prototype; the focusing wave is then experimentally re-emitted by the array. The quality of the achieved backpropagation is evaluated both in frequency and time domain: In this sense we can speak of Time Reversal. The excellent agreement between measured and theoretical results validates the potential of our system.

36 citations

Journal ArticleDOI
TL;DR: A novel low-power phase-conjugating mirror based on stimulated Brillouin scattering in a quartz fiber with an internal taper with reliable operation in both single- and multiple-longitudinal-mode operation was observed with conjugation fidelities larger than 95%.
Abstract: A novel low-power phase-conjugating mirror based on stimulated Brillouin scattering in a quartz fiber with an internal taper is reported. A peak-power threshold as low as 500??W and a maximum reflectivity of 92% were obtained with 30-ns pulses from a Q-switched Nd:YAG laser. The maximum peak powers of 130??kW demonstrated a dynamic range of 1:260. Reliable operation in both single- and multiple-longitudinal-mode operation was observed with conjugation fidelities larger than 95%.

36 citations

Journal ArticleDOI
TL;DR: In this paper, phase conjugation in staurable amplifiers by degenerate frequency mixing (DFM) was analyzed using numerical solutions for the appropriate equations, and the results were compared to those for saturable absorbers.
Abstract: Phase conjugation in staurable amplifiers by degenerate frequency mixing (DFM) is analyzed using numerical solutions for the appropriate equations. DFM reflectivities up to 104are predicted with pump intensities considerably less than the saturation intensity. The results are compared to those for saturable absorbers. Effects of spontaneous emission in the amplifiers are also considered.

36 citations

Journal ArticleDOI
TL;DR: By tailoring the leading edge of the pulse relative to the acoustic response time of the medium, good phase reproduction has been demonstrated for input energies of 100 times above threshold.
Abstract: The shot-to-shot phase fidelity of a stimulated-Brillouin-scattering phase conjugator operated many times above threshold has been found to be very sensitive to the slope of the leading edge of the input pulse. For a pulse with a rising edge that is short relative to the acoustic lifetime of the stimulated-Brillouin-scattering medium, strong random fluctuations in the fidelity of the wave-front reversal are observed. However, by tailoring the leading edge of the pulse relative to the acoustic response time of the medium, good phase reproduction has been demonstrated for input energies of 100 times above threshold.

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20237
202214
202125
202049
201948
201853