Results 111 to 120 of about 533 (174)
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Dark Photorefractive Spatial Solitons and Photorefractive Vortex Solitons
Physical Review Letters, 1995We report on the first experimental observations of dark, planar, spatial photorefractive solitons, and photorefractive vortex solitons that are trapped in a bulk (three-dimensional) photorefractive media. Both the dark and vortex solitons possess the ``signatures'' of the photorefractive solitons: they are independent of absolute intensity, can afford
, Duree +7 more
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Optical and photorefractive properties of InP:Ti: a new photorefractive semiconductor
Optics Letters, 1989The optical and photorefractive properties of Ti-doped InP are investigated. Four-wave mixing at wavelengths of 1.06 and 1.32 microm has been observed for the first time to our knowledge in semi-insulating InP:Ti. Room-temperature diffraction efficiencies for zero applied bias are larger than efficiencies measured previously for InP:Fe because of the ...
D D, Nolte +4 more
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International Ophthalmology Clinics, 2000
In this chapter, we have reviewed important aspects of PRK. A thorough understanding of the preoperative assessments, techniques, and postoperative management is essential to achieve satisfactory visual outcomes. Laser safety checks are mandatory. A well-functioning excimer laser with good optics is required.
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In this chapter, we have reviewed important aspects of PRK. A thorough understanding of the preoperative assessments, techniques, and postoperative management is essential to achieve satisfactory visual outcomes. Laser safety checks are mandatory. A well-functioning excimer laser with good optics is required.
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Optics Letters, 1998
We study self-channeling of light waves in a rotated cut of crystals of the 4mm and the 6mm classes, whose dominant mechanism is photorefractive diffusion nonlinearity. The existence of photorefractive line waves that can be guided along the edge of the crystal is suggested and analyzed.
S M, Shandarov, E S, Shandarov
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We study self-channeling of light waves in a rotated cut of crystals of the 4mm and the 6mm classes, whose dominant mechanism is photorefractive diffusion nonlinearity. The existence of photorefractive line waves that can be guided along the edge of the crystal is suggested and analyzed.
S M, Shandarov, E S, Shandarov
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Photorefractive Keratoplasty: Photorefractive Keratomania?
Archives of Ophthalmology, 1996Push the buttonand eliminate glasses. Sounds too good to be true, and those who are in the field of photorefractive keratoplasty (PRK) know the facts remain somewhere else. Certainly there are many happy patients who are ecstatic about the elimination of most or all of their myopia.
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Annihilation of photorefractive solitons
Optics Letters, 1998We investigate experimentally the interaction of two-dimensional solitary beams in photorefractive strontium barium niobate crystal. We show that simultaneous collision of many solitons can result in complete annihilation of some of them. This effect depends on the relative phases of the solitons and may be useful for application in the formation of ...
W, Królikowski +3 more
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Photorefractive shooting stars
Optics Letters, 1998Under certain conditions the direction of a beam diffracted from a photorefractive grating wanders as the grating decays. This phenomenon is due to competition between the original grating and those formed spontaneously by the Fabry-Perot modes produced by the crystal's surfaces.
R S, Cudney, M H, Garrett
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Pharmacotherapy of photorefractive keratectomy
Journal of Cataract and Refractive Surgery, 1996To compare the pharmacotherapeutic practices of high-volume photorefractive keratectomy (PRK) surgeons with suggested practices gleaned from the current literature.York Finch Eye Associates, Toronto, Canada.Seventy-five ophthalmic surgeons believed by the authors to do a high-volume of PRKs were surveyed over the summer of 1994 about their ...
S A, Arshinoff, M D, Mills, S, Haber
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Fixing the photorefractive soliton
Optics Letters, 1999We report the formation of permanent two-dimensional 12-microm waveguides in a bulk strontium barium niobate crystal. The waveguides are made by formation of a photorefractive spatial soliton in which the space-charge field induces ferroelectric domains that are permanently polarized opposite to the crystal c axis.
M, Klotz +4 more
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Photorefractive Phase Conjugators
Proceedings of the IEEE, 1992The author presents a tutorial review of various kinds of optical phase conjugators using photorefractive materials. These include externally pumped phase conjugators (EPPCs), self-pumped phase conjugators (SPPCs), and mutually pumped phase conjugators (MPPCs). He briefly describes optical phase conjugation and the photorefractive effect.
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