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Showing 1 to 13 of 13 for “"phase-conjugation"”.
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Focusing Light Inside Scattering Media with Optical Phase Conjugation
… light deep inside scattering media, optical phase conjugation based wavefront shaping techniques, such as time-reversed ultrasonically encoded (TRUE) optical focusing, are being actively developed. In this dissertation, I will describe our efforts to improve the performance (speed, focusing …
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Efficient, fast, low power, optical phase conjugation using two-photon-induced Zeeman coherence in rubidium
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Holographic lasers
… solid state lasers which dynamically correct for phase distortions within their cavity by phase conjugation. A fibre based four-wave mixing scheme is investigated but no experimental evidence of any phase conjugation is observed.
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Photonics Based Techniques for Millimeter-Wave Generation, Transmission, and Multiplexing
… dispersion is discussed in addition to the phase conjugation way of dispersion compensation. Dispersion compensation based on phase conjugation was also simulated and applied to OSSB millimeter-wave generator in order to transmit the generated signals through 100 km of fiber and data rate of …
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Nonlinear optical effects in nematic liquid crystals
… the experiments. Some potential applications of phase conjugation obtained by the backward degenerate four wave-mixing process in the field of adaptive optics and image processing are demonstrated.
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Harmonic phase based low coherence interferometry : a method for studying the dynamics and structures of cells
… medium through the simultaneous use of phase conjugation and plane reflection. We show that the method is robust and warrants experimental investigation as a means for optical deep tissue imaging.
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Holographic laser resonators
… of a CW solid-state adaptive resonator that uses phase-conjugation to actively correct for phase distortions present within the resonator loop. It is shown that the phase-conjugate of a given beam can be produced by the process of degenerate four-wave mixing inside a gain medium. In this scheme …
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Investigation of dual-pump fiber optical parametric amplifier using highly nonlinear dispersion shifted fiber
… mid-frequency spectra, wavelength conversion, phase conjugation, pulse processing for signal processing and 0 dB noise counting. Furthermore, single pump FOPA had limited parametric gain over wide bandwidth, in addition to the difficulty to obtain an equalized power. To overcome such problem …
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Iterative image processing using a cavity with a phase-conjugate mirror: possibilities and limitations
… image feedback system utilizing a cavity with a phase-conjugate mirror (PCM) has been studied. A new theory, based on operators, is developed to describe the steady-state output of the cavity. The use of operators allows one to describe the various optical operations and transformations needed in …
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Spatiotemporal dynamics of a photorefractive phase-conjugate resonator
The spatiotemporal dynamics of a photorefractive phase-conjugate resonator (PPCR) is studied both experimentally and analytically. The resonator is a confocal cavity bounded by a dielectric mirror and a phase-conjugate mirror in a four wave mixing geometry. The effect of the Bragg mismatch, which …
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Stimulated Brillouin scattering in an on-chip microdisk resonator
… SBS lasers, microwave oscillators, optical phase conjugation and slow light. Nonlinear optical phenomena can be enhanced in resonant systems due to the significantly increased interaction times between photons. In this regard, the SBS nonlinearity has already been demonstrated in resonators …
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Exploitation of Modes in Circular Antenna Arrays
… of the MMCA was well exploited by using phaselocked loop (PLL) based hardware for direct digital beamforming. Here, different types of beam-forming like uni-cast for single beam, multi-cast for multiple beams, broad-cast for full azimuthal beam coverage using mode-0, and simultaneous …
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Design and investigation of the emission dynamics of a mode-locked SBS-laser oscillator
… laser. Another feature of the SBS-reflection is phase conjugation, which leads to an excellent beam quality thanks to the compensation of phase distortions. Transverse fundamental mode operation and a beam quality better than 1.4 times diffraction limited can be maintained for average output …